Dr. Abhijit Biswas Profile

Dr. Abhijit Biswas

Supervisor

SPIE Involvement:

Conference Program Committee | Author

Publications (58)

Proceedings Article | 13 March 2024 Presentation

Optical links with electronically steerable apertures

Jared Sisler, Prachi Thureja, Joseph Kovalik, William T. Roberts, Ruzan Sokhoyan, Harry Atwater, Abhijit Biswas

Proceedings Volume 12877, 128770N (2024) https://doi.org/10.1117/12.3003475

KEYWORDS: Free space optics, Beam steering, Transceivers, Free space optical communications, Wavefront sensors, Solar system, Robotics, Reflection, Plasmonics, Oxides

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Proceedings Article | 12 March 2024 Presentation + Paper

Deep space optical communications (DSOC) technology demonstration pre-launch validation and performance tests with the laser test evaluation station (LTES)

Angel Velasco, Jason Allmaras, Joseph Kovalik, Vachik Garkanian, Brett Douglas, Erik Alerstam, Malcolm Wright, Sarah Haque, Vincent Van Rhein, Daniel Macdonald, David Zhu, Oscar Alvarez-Salazar, Dylan Conway, Gerardo Ortiz, Sabino Piazzolla, Yanhua Anderson, Kenneth Andrews, Meera Srinivasan, Abhijit Biswas

Proceedings Volume 12877, 1287707 (2024) https://doi.org/10.1117/12.3008378

KEYWORDS: Cameras, Space operations, Scintillation, Receivers, Laser communications, Laser communication terminals, Calibration, Short wave infrared radiation, Engineering, Control systems

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Proceedings Article | 12 March 2024 Presentation + Paper

Deep space optical communications technology demonstration

Abhijit Biswas, Meera Srinivasan, Kenneth Andrews, Erik Alerstam, Angel Velasco, Malcolm Wright, Joseph Kovalik, Brett Douglas, Jason Allmaras, Vincent Van Rhein, Emma Wollman, Ryan Rogalin, Sean Meenehan, David Zhu, Dylan Conway, Oscar Alvarez-Salazar, Christopher Pong, Herrick Chang, Marcus Wilkerson, Edwin Grigorian, Nathaniel Richard, Daniel Cho, Yuri Beregovski, William Buehlman, Luke Stewart, Mark Brewer, Christine Chen, Vachik Garkanian, Gerardo Ortiz, Daniel Macdonald, Sarah Haque, Matthew Shaw, Christopher Leffler, Greg Agnes, Joel Johnson, Arthur Na-Nakornpanom, Rogeliio Rosas, Jason Mumolo, Oliver Lay, Roger O'Brient, Marcum Martz, Gregory Miles, Kitt Matthews, Hernan Erlig, Dorothy Lewis, Anthony Mittskus, Serge Dubovitsky, William Klipstein

Proceedings Volume 12877, 1287706 (2024) https://doi.org/10.1117/12.3001750

KEYWORDS: Space operations, Telescopes, Signal processing, Receivers, Transmitters, Laser safety, Interfaces, Sensors, Deep space optical communications, Actuators

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Proceedings Article | 15 March 2023 Presentation + Paper

Ground station for terabyte infrared delivery (TBIRD)

Sabino Piazzolla, William Roberts, Joseph Kovalik, Michael Peng, Vachik Garkanian, Christine Chen, William Buehlman, Mark Brewer, Gerardo Ortiz, Kittrin Matthews, Angel Velasco, Abhijit Biswas

Proceedings Volume 12413, 1241311 (2023) https://doi.org/10.1117/12.2655123

KEYWORDS: Telescopes, Adaptive optics, Cameras, Satellites, Wavefront sensors, Clouds, Beam splitters, Optical turbulence

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Proceedings Article | 15 March 2023 Presentation + Paper

Optical-to-Orion (O2O) ground terminal (GT) at Table Mountain Facility (TMF)

Abhijit Biswas, Sabino Piazzolla, Arvid Croonquist, Erik Alerstam, Malcolm Wright, Matthew Shaw, Emma Wollman, Ryan Rogalin, Sean Meenehan, Christine Chen, Jason Allmaras

Proceedings Volume 12413, 124130T (2023) https://doi.org/10.1117/12.2650574

KEYWORDS: Telescopes, Signal attenuation, Tunable filters, Signal detection, Pulsed laser operation, Signal processing, Modulation, Acquisition tracking and pointing

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Proceedings Article | 15 March 2023 Presentation + Paper

The Deep Space Optical Communications project ground laser receiver

Meera Srinivasan, Erik Alerstam, Emma Wollman, Ryan Rogalin, Seán Meenehan, Matthew Shaw, Angel Velasco, Abhijit Biswas, Nate Richard, Daniel Cho, Vachik Garkanian, Jason Allmaras, Gregory Miles, Edwin Grigorian

Proceedings Volume 12413, 124130R (2023) https://doi.org/10.1117/12.2649577

KEYWORDS: Telescopes, Cameras, Receivers, Data acquisition, Signal detection, Signal processing, Space operations, Photon counting

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Proceedings Article | 15 March 2023 Presentation + Paper

The Deep Space Optical Communications project ground laser transmitter

Meera Srinivasan, Angel Velasco, Malcolm Wright, Seán Meenehan, Michael Peng, Ryan Rogalin, Nate Richard, Abhijit Biswas, Alexa Aguilar, Yuri Beregovski, Mark Brewer, William Buehlman, Jason Allmaras, Gerardo Ortiz, Vachik Garkanian

Proceedings Volume 12413, 124130Q (2023) https://doi.org/10.1117/12.2649561

KEYWORDS: Telescopes, Mirrors, Laser safety, High power lasers, Optical transmission, Transmitters, Space operations

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Proceedings Article | 15 February 2018 Paper

Deep space optical communications

Abhijit Biswas, Meera Srinivasan, Sabino Piazzolla, Daniel Hoppe

Proceedings Volume 10524, 105240U (2018) https://doi.org/10.1117/12.2296426

KEYWORDS: Space operations, Optical communications, Transmitters, Space telescopes, Telescopes, Telecommunications, Mars, Sensors, Sun, Receivers

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Proceedings Article | 24 February 2017 Paper

Multi-beam laser beacon propagation over lunar distance: comparison of predictions and measurements

A. Biswas, S. Piazzolla

Proceedings Volume 10096, 1009607 (2017) https://doi.org/10.1117/12.2254976

KEYWORDS: Atmospheric propagation, Scintillation, Laser communications, Optical simulations, Modulation, Wave propagation, Atmospheric scintillation, Telecommunications, Laser systems engineering, Transmitters, Telescopes, Zoom lenses, Atmospheric optics, Optical turbulence, Data modeling, Space telescopes

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Proceedings Article | 24 February 2017 Paper

Binary polarization-shift-keyed modulation for interplanetary CubeSat optical communications

Michael Peng, William Farr, Michael Borden, Abhijit Biswas, Joseph Kovalik

Proceedings Volume 10096, 100960B (2017) https://doi.org/10.1117/12.2255520

KEYWORDS: Modulation, Polarization, Signal to noise ratio, Transmitters, Receivers, Optical communications, Laser communications, Semiconductor lasers, Optical instrument design, Optical design, Clocks, Binary data, Interference (communication)

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Proceedings Article | 9 August 2016 Paper

Nanoradian ground-based astrometry, optical navigation, and artificial reference stars

Chengxing Zhai, Michael Shao, Abhijit Biswas, Todd Ely, Christopher Jacobs, Joseph Lazio, Tomas Martin-Mur, William Owen, Mike Rud, Navtej Saini, Jagmit Sandhu, Slava Turyshev, Thomas Werne

Proceedings Volume 9908, 99085B (2016) https://doi.org/10.1117/12.2233689

KEYWORDS: Stars, Space operations, Distortion, Space telescopes, Telescopes, Optical navigation, Adaptive optics, Refraction, Turbulence, Optical communications

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Proceedings Article | 15 March 2016 Paper

Deep space laser communications

Abhijit Biswas, Joseph Kovalik, Meera Srinivasan, Matthew Shaw, Sabino Piazzolla, Malcolm Wright, William Farr

Proceedings Volume 9739, 97390Q (2016) https://doi.org/10.1117/12.2217428

KEYWORDS: Laser communications, Laser applications, Acquisition tracking and pointing, Telecommunications, Laser systems engineering, Systems engineering, Space operations, Sensors, Staring arrays, Optical communications, Signal processing, Receivers, Photon counting, Mars

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Proceedings Article | 15 March 2016 Paper

LEO-to-ground optical communications link using adaptive optics correction on the OPALS downlink

Malcolm Wright, Joseph Kovalik, Jeff Morris, Matthew Abrahamson, Abhijit Biswas

Proceedings Volume 9739, 973904 (2016) https://doi.org/10.1117/12.2211201

KEYWORDS: Adaptive optics, Optical communications, Free space optics, Single mode fibers, Free space optical communications, Receivers, Atmospheric optics, Cameras

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Proceedings Article | 16 March 2015 Paper

Achieving operational two-way laser acquisition for OPALS payload on the International Space Station

Matthew Abrahamson, Bogdan Oaida, Oleg Sindiy, Abhijit Biswas

Proceedings Volume 9354, 935408 (2015) https://doi.org/10.1117/12.2182473

KEYWORDS: Cameras, Signal detection, Space telescopes, Telescopes, CCD cameras, Detection and tracking algorithms, Receivers, Clouds, Space operations, Optical tracking

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Proceedings Article | 16 March 2015 Paper

Upwelling radiance at 976 nm measured from space using the OPALS CCD camera on the ISS

Abhijit Biswas, Joseph Kovalik, Bogdan Oaida, Matthew Abrahamson, Malcolm Wright

Proceedings Volume 9354, 93540A (2015) https://doi.org/10.1117/12.2084965

KEYWORDS: Cameras, Atmospheric modeling, Clouds, Visibility, Scalable video coding, CCD cameras, Sun, Aerosols, Optical filters, Sensors

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Proceedings Article | 16 March 2015 Paper

Optical payload for lasercomm science (OPALS) link validation during operations from the ISS

Abhijit Biswas, Bogdan Oaida, Kenneth Andrews, Joseph Kovalik, Matthew Abrahamson, Malcolm Wright

Proceedings Volume 9354, 93540F (2015) https://doi.org/10.1117/12.2084964

KEYWORDS: Atmospheric modeling, Cameras, Laser optics, Atmospheric optics, Space operations, Scintillation, Sensors, Visibility, Clouds, Atmospheric sciences

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Proceedings Article | 6 March 2014 Paper

Improving the efficiency of undersea laser communications

H. Hemmati, A. Biswas

Proceedings Volume 8971, 89710I (2014) https://doi.org/10.1117/12.2042254

KEYWORDS: Modulation, Transmitters, Receivers, Scattering, Laser scattering, Signal attenuation, Optical communications, Ocean optics, Laser communications, Photon counting

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Proceedings Article | 6 March 2014 Paper

LLCD operations using the Optical Communications Telescope Laboratory (OCTL)

Abhijit Biswas, Joseph Kovalik, Malcolm Wright, William Roberts, Michael Cheng, Kevin Quirk, Meera Srinivasan, Matthew Shaw, Kevin Birnbaum

Proceedings Volume 8971, 89710X (2014) https://doi.org/10.1117/12.2044087

KEYWORDS: Telescopes, Space telescopes, Cameras, Receivers, Laser safety, Space operations, Laser applications, Clouds, Sensors, Stars

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Proceedings Article | 6 March 2014 Paper

Optical link design and validation testing of the Optical Payload for Lasercomm Science (OPALS) system

Bogdan Oaida, William Wu, Baris Erkmen, Abhijit Biswas, Kenneth Andrews, Michael Kokorowski, Marcus Wilkerson

Proceedings Volume 8971, 89710U (2014) https://doi.org/10.1117/12.2045351

KEYWORDS: Video, Video compression, Laser optics, Telescopes, Receivers, Space telescopes, Free space optics, Telecommunications, Optical design, Optical communications

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Proceedings Article | 6 March 2014 Paper

Pointing, acquisition, and tracking architecture tools for deep-space optical communications

Swati Mohan, Oscar Alvarez-Salazar, Kevin Birnbaum, Abhijit Biswas, William Farr, Hamid Hemmati, Shawn Johnson, Geraldo Ortiz, Kevin Quirk, Zahidul Rahman, Martin Regher, Farheen Rizvi, Joel Shields, Meera Srinivasan

Proceedings Volume 8971, 89710H (2014) https://doi.org/10.1117/12.2042704

KEYWORDS: Optical communications, Sensors, Space operations, Systems engineering, Asteroids, Error analysis, Receivers, Transmitters, Ka band, Signal attenuation

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Proceedings Article | 19 March 2013 Paper

The Lunar Laser OCTL Terminal (LLOT)

Abhijit Biswas, Joseph Kovalik

Proceedings Volume 8610, 86100O (2013) https://doi.org/10.1117/12.2006454

KEYWORDS: Telescopes, Space telescopes, Sensors, Receivers, Signal detection, Space operations, Cameras, Indium gallium arsenide, Laser communications, Laser safety

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Proceedings Article | 23 February 2012 Paper

10-Gb/s lasercom system for spacecraft

J. Kovalik, H. Hemmati, A. Biswas

Proceedings Volume 8246, 82460F (2012) https://doi.org/10.1117/12.908644

KEYWORDS: Space operations, Head, Receivers, Cameras, Mirrors, Laser systems engineering, Prototyping, Laser optics, Optical filters, Control systems

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Proceedings Article | 23 February 2012 Paper

Evaluation of deep-space laser communication under different mission scenarios

Abhijit Biswas, Sabino Piazzolla, Bruce Moision, Douglas Lisman

Proceedings Volume 8246, 82460W (2012) https://doi.org/10.1117/12.913216

KEYWORDS: Signal to noise ratio, Space operations, Mars, Receivers, Optical communications, Ka band, Telecommunications, Jupiter, Astrophysics, Lanthanum

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Proceedings Article | 23 February 2012 Paper

Overview and status of the Lunar Laser Communications Demonstration

D. Boroson, B. Robinson, D. Burianek, D. Murphy, A. Biswas

Proceedings Volume 8246, 82460C (2012) https://doi.org/10.1117/12.914801

KEYWORDS: Telescopes, Space telescopes, Space operations, Optical communications, Receivers, Ocean optics, Laser communications, Electronics, Atmospheric optics, Transmitters

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Proceedings Article | 2 March 2011 Paper

Deep-space optical terminals (DOT)

H. Hemmati, W. Farr, A. Biswas, K. Birnbaum, W. Roberts, K. Quirk, S. Townes

Proceedings Volume 7923, 79230C (2011) https://doi.org/10.1117/12.878930

KEYWORDS: Telescopes, Space telescopes, Sensors, Space operations, Mars, Photons, Control systems, Signal detection, Receivers, Modulation

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Proceedings Article | 24 August 2010 Paper

Pointing performance of an aircraft-to-ground optical communications link

Martin Regehr, Abhijit Biswas, Joseph Kovalik, Malcolm Wright

Proceedings Volume 7814, 781403 (2010) https://doi.org/10.1117/12.858632

KEYWORDS: Control systems, Transceivers, Device simulation, Control systems design, Sensors, Optical communications, Cameras, Interfaces, Mars, Telecommunications

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Proceedings Article | 26 February 2010 Paper

Low complexity transceivers and autonomous concept of operations for optical planetary access links

Abhijit Biswas, Joseph Kovalik, Malcolm Wright, Martin Regehr

Proceedings Volume 7587, 75870H (2010) https://doi.org/10.1117/12.846643

KEYWORDS: Transceivers, Mars, Receivers, Cameras, Signal attenuation, Space operations, Transmitters, Prototyping, Optical filters, Forward error correction

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Proceedings Article | 26 February 2010 Paper

Emulating an optical planetary access link with an aircraft

Abhijit Biswas, Joseph Kovalik, Martin Regehr, Malcolm Wright

Proceedings Volume 7587, 75870B (2010) https://doi.org/10.1117/12.845225

KEYWORDS: Transceivers, Cameras, Video, Mars, Free space optical communications, Global Positioning System, Semiconductor lasers, Photography, Free space optics, Telecommunications

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Proceedings Article | 26 February 2010 Paper

Preliminary results of the OCTL to OICETS optical link experiment (OTOOLE)

Keith Wilson, Joseph Kovalik, Abhijit Biswas, Malcolm Wright, William Roberts, Yoshihisa Takayama, Shiro Yamakawa

Proceedings Volume 7587, 758703 (2010) https://doi.org/10.1117/12.845063

KEYWORDS: Satellites, Telescopes, Receivers, Optical communications, Satellite communications, Laser communications, Sensors, Space telescopes, Modulation, Mirrors

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Proceedings Article | 26 February 2010 Paper

Data products for the OCTL to OICETS optical link experiment

J. Kovalik, A. Biswas, K. Wilson, M. Wright, W. Roberts

Proceedings Volume 7587, 75870C (2010) https://doi.org/10.1117/12.845623

KEYWORDS: Data acquisition, Sensors, Satellites, Telescopes, Binary data, Receivers, Atmospheric modeling, Optical communications, Signal detection, Video

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Proceedings Article | 24 February 2009 Paper

Autonomous access links using laser communications

Joseph Kovalik, Abhijit Biswas, Jeffrey Charles, Martin Regehr

Proceedings Volume 7199, 71990H (2009) https://doi.org/10.1117/12.810733

KEYWORDS: Cameras, Sensors, Mars, Free electron lasers, Data acquisition, Transceivers, Calibration, Space operations, CCD cameras, Electroluminescence

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Proceedings Article | 24 February 2009 Paper

Combined laser communications and laser ranging transponder for Moon and Mars

H. Hemmati, K. Birnbaum, W. Farr, S. Turyshev, A. Biswas

Proceedings Volume 7199, 71990N (2009) https://doi.org/10.1117/12.810431

KEYWORDS: Ranging, Mars, Sensors, Transponders, Signal detection, Laser communications, Optical filters, Telescopes, Signal attenuation, Laser applications

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Proceedings Article | 20 February 2008 Paper

30-dB data rate improvement for interplanetary laser communication

H. Hemmati, A. Biswas, D. Boroson

Proceedings Volume 6877, 687707 (2008) https://doi.org/10.1117/12.767696

KEYWORDS: Laser communications, Space telescopes, Telescopes, Mars, Telecommunications, Receivers, Space operations, Sensors, Data communications, Transceivers

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Proceedings Article | 4 May 2007 Paper

Development of laser beam transmission strategies for future ground-to-space optical communications

Keith Wilson, Joseph Kovalik, Abhijit Biswas, William Roberts

Proceedings Volume 6551, 65510B (2007) https://doi.org/10.1117/12.720803

KEYWORDS: Space telescopes, Telescopes, Satellites, Mirrors, Optical communications, Signal attenuation, Space operations, Laser beam propagation, Laser safety, Sensors

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Proceedings Article | 13 February 2007 Paper

Infrared Earth tracking for deep-space optical communications: feasibility study based on laboratory emulator

Yijiang Chen, Jeffrey Charles, Hamid Hemmati, Abhijit Biswas

Proceedings Volume 6457, 64570A (2007) https://doi.org/10.1117/12.711541

KEYWORDS: Infrared imaging, Infrared cameras, Quantum well infrared photodetectors, Mirrors, Thermography, Cameras, Infrared telescopes, Infrared search and track, Signal detection, Telescopes

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Proceedings Article | 1 March 2006 Paper

Mars laser communication demonstration: what it would have been

A. Biswas, D. Boroson, B. Edwards

Proceedings Volume 6105, 610502 (2006) https://doi.org/10.1117/12.669551

KEYWORDS: Telescopes, Mars, Sensors, Space telescopes, Receivers, Laser communications, Space operations, Molybdenum, Signal detection, Transceivers

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Proceedings Article | 1 March 2006 Paper

Simplified lasercom system architecture using a disturbance-free platform

Chien-Chung Chen, Hamid Hemmati, Abhijit Biswas, Gerardo Ortiz, William Farr, Nelson Pedreiro

Proceedings Volume 6105, 610505 (2006) https://doi.org/10.1117/12.660264

KEYWORDS: Laser systems engineering, Space operations, Control systems, Telecommunications, Laser optics, Laser stabilization, Laser applications, Transceivers, Sensors, Stars

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Proceedings Article | 18 April 2005 Paper

Uplink beacon laser for Mars laser communication demonstration (MLCD)

Abhijit Biswas, Malcolm Wright, Joseph Kovalik, Sabino Piazzolla

Proceedings Volume 5712, (2005) https://doi.org/10.1117/12.600832

KEYWORDS: Telescopes, Space telescopes, Mars, Optical simulations, Turbulence, Space operations, Laser communications, Device simulation, Laser development, Atmospheric turbulence

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Proceedings Article | 18 April 2005 Paper

Approach for acquiring and tracking downlink from Mars using the Hale telescope

Abhijit Biswas, Sabino Piazzolla, K. Quirk, Gerardo Ortiz, Shinhak Lee, Meera Srinivasan, Chien Chung Chen

Proceedings Volume 5712, (2005) https://doi.org/10.1117/12.600833

KEYWORDS: Mars, Telescopes, Sensors, Space telescopes, Staring arrays, Signal detection, Signal processing, Line of sight stabilization, Optical filters, Space operations

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Proceedings Article | 18 April 2005 Paper

Airborne optical communications demonstrator design and pre-flight test results

Abhijit Biswas, Norman Page, Jerry Neal, David Zhu, Malcolm Wright, Gerardo Ortiz, William Farr, Hamid Hemmati

Proceedings Volume 5712, (2005) https://doi.org/10.1117/12.600834

KEYWORDS: Mirrors, Head, Sensors, Optical fabrication, Cameras, Optical communications, Collimators, Telescopes, Beam splitters, Imaging systems

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Proceedings Article | 16 June 2004 Paper

Deep-space optical communications link availability and data volume

Abhijit Biswas, Keith Wilson, Sabino Piazzolla, Janet Wu, William Farr

Proceedings Volume 5338, (2004) https://doi.org/10.1117/12.537823

KEYWORDS: Signal attenuation, Clouds, Space operations, Mars, Sun, Atmospheric modeling, Visibility, Optical communications, Receivers, Optical networks

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Proceedings Article | 16 June 2004 Paper

MLCD: overview of NASA's Mars laser communications demonstration system

Don Boroson, Abhijit Biswas, Bernard Edwards

Proceedings Volume 5338, (2004) https://doi.org/10.1117/12.543014

KEYWORDS: Mars, Telescopes, Telecommunications, Space telescopes, Laser communications, Laser systems engineering, Receivers, Mirrors, Sun, Space operations

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Proceedings Article | 3 July 2003 Paper

Design and development of a robust ATP subsystem for the Altair UAV-to-ground lasercomm 2.5-Gbps demonstration

Gerardo Ortiz, Shinhak Lee, Steve Monacos, Malcolm Wright, Abhijit Biswas

Proceedings Volume 4975, (2003) https://doi.org/10.1117/12.478939

KEYWORDS: Unmanned aerial vehicles, Acquisition tracking and pointing, Cameras, Sensors, Optical communications, Telescopes, Staring arrays, Optical coherence tomography, Error analysis, Receivers

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Proceedings Article | 26 April 2002 Paper

Multigigabit data-rate optical communication depicting LEO-to-GEO and GEO-to-ground links

Hamid Hemmati, Malcolm Wright, Babak Sanii, Norman Page, Gerry Ortiz, Abhijit Biswas, Keith Wilson

Proceedings Volume 4635, (2002) https://doi.org/10.1117/12.464091

KEYWORDS: Receivers, Transmitters, Optical communications, Telescopes, Acquisition tracking and pointing, Space telescopes, Space operations, Signal attenuation, Fiber amplifiers, Wavelength division multiplexing

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Proceedings Article | 26 April 2002 Paper

Pulse position modulated (PPM) ground receiver design for optical communications from deep space

Abhijit Biswas, Victor Vilnrotter, William Farr, D. Fort, E. Sigman

Proceedings Volume 4635, (2002) https://doi.org/10.1117/12.464093

KEYWORDS: Receivers, Sensors, Signal detection, Pulsed laser operation, Clocks, Space operations, Transmitters, Optical communications, Analog electronics, Avalanche photodetectors

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Proceedings Article | 26 April 2002 Paper

Ground detectors for optical communications from deep space

Abhijit Biswas, Beckett Madden-Woods, Meera Srinivasan, Victor Vilnrotter, William Farr

Proceedings Volume 4635, (2002) https://doi.org/10.1117/12.464111

KEYWORDS: Sensors, Avalanche photodetectors, Photons, Near infrared, Silicon, Interference (communication), Signal detection, Quantum efficiency, Pulsed laser operation, Q switched lasers

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Proceedings Article | 20 June 2001 Paper

45-km horizontal path optical link demonstration

Abhijit Biswas, Malcolm Wright, Babak Sanii, Norman Page

Proceedings Volume 4272, (2001) https://doi.org/10.1117/12.430789

KEYWORDS: Telescopes, Surface plasmons, Sensors, Mirrors, Scintillation, Optical communications, Space telescopes, Atmospheric optics, Avalanche photodetectors, Charge-coupled devices

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Proceedings Article | 20 June 2001 Paper

Laboratory characterization of silicon avalanche photodiodes (APD) for pulse position modulation (PPM) detection

Meera Srinivasan, Beckett Madden-Woods, Jon Hamkins, Abhijit Biswas

Proceedings Volume 4272, (2001) https://doi.org/10.1117/12.430790

KEYWORDS: Avalanche photodetectors, Sensors, Interference (communication), Probability theory, Photons, Detection theory, Error analysis, Modulation, Bismuth, Data modeling

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Proceedings Article | 2 May 2000 Paper

High-efficiency pulsed laser transmitters for deep-space communication

Hamid Hemmati, Malcolm Wright, Abhijit Biswas, Carlos Esproles

Proceedings Volume 3932, (2000) https://doi.org/10.1117/12.384309

KEYWORDS: Diodes, Quantum efficiency, Semiconductor lasers, Pulsed laser operation, Transmitters, Nd:YAG lasers, Energy efficiency, Q switching, Fiber lasers, Thermal modeling

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Proceedings Article | 2 May 2000 Paper

Design of the optoelectronic receiver for deep-space optical communications

Gerry Ortiz, John Sandusky, Abhijit Biswas

Proceedings Volume 3932, (2000) https://doi.org/10.1117/12.384304

KEYWORDS: Sensors, Receivers, Telescopes, Avalanche photodetectors, Signal detection, Optoelectronics, Quantum efficiency, Mars, Space telescopes, Photons

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Proceedings Article | 26 April 1999 Paper

45-km horizontal-path optical link experiment

Abhijit Biswas, Juan Ceniceros, Matthew Novak, Muthu Jeganathan, Angel Portillo, David Erickson, Jon De Pew, Babak Sanii, James Lesh

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346202

KEYWORDS: Telescopes, Surface plasmons, Atmospheric optics, Optical communications, Space telescopes, Charge-coupled devices, Sensors, Mirrors, Avalanche photodetectors, Clocks

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Mountain-top to mountain-top optical link experiments have been initiated at JPL, in order to perform a systems level evaluation of optical communications. Progress made so far is reported. The NASA, JPL developed optical communications demonstrator (OCD) is used to transmit a laser signal from Strawberry Peak (SP), located in the San Bernadino mountains of California. This laser beam is received by a 0.6 m aperture telescope at JPL's Table Mountain Facility (TMF), located in Wrightwood, California. The optical link is bi-directional with the TMF telescope transmitting a continuous 4-wave (cw) 780 nm beacon and the OCD sending back an 840 nm, 100 - 500 Mbps pseudo noise (PN) modulated, laser beam. The optical link path is at an average altitude of 2 Km above sea level, covers a range of 46.8 Km and provides an atmospheric channel equivalent to approximately 4 air masses. Average received power measured at either end fall well within the uncertainties predicted by link analysis. The reduction in normalized intensity variance ((sigma) _I²) for the 4- beam beacon, compared to each individual beam, at SP, was from approximately 0.68 to 0.22. With some allowance for intra-beam mis-alignment, this is consistent with incoherent averaging. The (sigma) _I² measured at TMF approximately 0.43 plus or minus 0.22 exceeded the expected aperture averaged value of less than 0.1, probably because of beam wander. The focused spot sizes of approximately 162 plus or minus 6 micrometer at the TMF Coude and approximately 64 plus or minus 3 micrometer on the OCD compare to the predicted size range of 52 - 172 micrometer and 57 - 93 micrometer, respectively. This is consistent with 4 - 5 arcsec of atmospheric 'seeing.' The preliminary evaluation of OCD's fine tracking indicates that the uncompensated tracking error is approximately 3.3 (mu) rad compared to approximately 1.7 (mu) rad observed in the laboratory. Fine tracking performance was intermittent, primarily due to beacon fades on the OCD tracking sensor. The best bit error rates observed while tracking worked were 1E - 5 to 1E - 6.

Proceedings Article | 26 April 1999 Paper

Overview of the preliminary design of the Optical Communication Demonstration and High-Rate Link Facility

John Sandusky, Muthu Jeganathan, Gerry Ortiz, Abhijit Biswas, Sukhan Lee, George Parker, Brad Liu, Donald Johnson, Jon De Pew, James Lesh

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346178

KEYWORDS: Optical communications, Telecommunications, Telescopes, Space telescopes, Scintillation, Receivers, Atmospheric optics, Optical design, Space operations, Signal attenuation

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Proceedings Article | 26 April 1999 Paper

High-data-rate laser transmitters for free-space laser communications

Abhijit Biswas, Hamid Hemmati, James Lesh

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346189

KEYWORDS: Pulsed laser operation, Semiconductor lasers, Fiber amplifiers, Sensors, Modulation, Oscillators, Laser applications, Optical amplifiers, Diodes, Solid state lasers

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Proceedings Article | 26 April 1999 Paper

Lessons learned from the Optical Communications Demonstrator (OCD)

Muthu Jeganathan, Angel Portillo, Caroline Racho, Sukhan Lee, David Erickson, Jon De Pew, Steve Monacos, Abhijit Biswas

Proceedings Volume 3615, (1999) https://doi.org/10.1117/12.346188

KEYWORDS: Charge-coupled devices, Electronics, Digital signal processing, Optical communications, Staring arrays, Mirrors, Fiber coupled lasers, Telescopes, Space telescopes, Optical tracking

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Proceedings Article | 27 May 1998 Paper

Lasercom test and evaluation station (LTES) development: an update

Abhijit Biswas, Keith Wilson, Norman Page

Proceedings Volume 3266, (1998) https://doi.org/10.1117/12.308712

KEYWORDS: Sensors, Data acquisition, Transmitters, Laser development, Mirrors, Modulation, Channel projecting optics, Receivers, Data modeling, Optical testing

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Proceedings Article | 27 May 1998 Paper

Results of the STRV-2 lasercom terminal evaluation tests

Abhijit Biswas, George Williams, Keith Wilson, Harel Hakakha, Ron Stieger, Eric Korevaar

Proceedings Volume 3266, (1998) https://doi.org/10.1117/12.308694

KEYWORDS: Transmitters, Receivers, Sensors, Avalanche photodetectors, Cameras, Laser missile defense, Telescopes, Modulation, Optical communications, Satellites

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The STRV-2 lasercom terminal (LCT) was designed and developed by AstroTerra Corporation of San Diego, California, under funding from the Ballistic Missile Defense Organization (BMDO). Scheduled for launch in late 1998 it will be used to demonstrate, for the first time, high data rate bi-directional satellite-to-ground optical communications. Concurrently with the development of the STRV-2 lasercom NASA/JPL was assembling the lasercom test and evaluation station (LTES), a high quality test platform for pre-flight characterization of optical communications terminals. The respective development schedules allowed evaluation of the STRV-2 LCT using LTES, for a month, prior to integration of the LCT with the spacecraft palette. Final co-alignment of the transmitter lasers to within plus or minus 20 (mu) rads with respect to the receive axis was achieved. This in turn allowed the specified 76 (mu) rad transmit beam divergence to be realized. However, subjecting the LCT to expected on-orbit temperatures revealed that the co-alignment deteriorated causing beam spreading, a finding which prompted the recommendation to operate the lasers warmed up during ground encounters. The 'bent-pipe' operation bit-error rates (BER) at 155, 194 and 325 Mbps were less than or equal to 1E - 10 over an approximately 20 dB range of irradiance measured at the receive telescope aperture. At 500 Mbps BER's of 1E-6 were achieved over an approximately 6 dB irradiance range, suggesting greater vulnerability to atmosphere induced fades. A pointing offset between the acquisition receivers and transmitter lasers of 1 mrad was measured. The impact of this offset will be to limit acquisition camera framing rates to 87 and 251 Hz, thus limiting the tracking loop bandwidth. Tracking performance test of the lasercom terminal, though planned could not be carried out because the software was not ready at the time of testing with LTES. The test results obtained for STRV-2 lasercom terminal will be used for designing the ground receiver.

Proceedings Article | 24 April 1997 Paper

Lasercom test and evaluation station for flight-terminal evaluation

Keith Wilson, Norman Page, Abhijit Biswas, Hamid Hemmati, Kevin Masters, David Erickson, James Lesh

Proceedings Volume 2990, (1997) https://doi.org/10.1117/12.273690

KEYWORDS: Sensors, Mirrors, Beam splitters, Laser communications, Channel projecting optics, Data acquisition, Cameras, Off axis mirrors, Control systems, Telescopes

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Proceedings Article | 15 June 1995 Paper

Effect of aperture averaging on a 570-Mbps 42 km horizontal path optical link

Keith Wilson, Abhijit Biswas, Scott Bloom, Victor Chan

Proceedings Volume 2471, (1995) https://doi.org/10.1117/12.211934

KEYWORDS: Optical communications, Turbulence, Receivers, Signal to noise ratio, Sensors, Scintillation, Atmospheric propagation, Transmitters, Telescopes, Avalanche photodetectors

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