Design and fabrication of complex fiber Bragg gratings using diffractive optics technology

Yunlong Sheng; Joshua E. Rothenberg; Hongpu Li

doi:10.1117/12.569816

11 January 2005 Design and fabrication of complex fiber Bragg gratings using diffractive optics technology

Yunlong Sheng, Joshua E. Rothenberg, Hongpu Li

Proceedings Volume 5642, Information Optics and Photonics Technology; (2005) https://doi.org/10.1117/12.569816
Event: Photonics Asia, 2004, Beijing, China

Abstract

We have applied the diffractive optics and digital holography technologies to the design and fabrication of fiber Bragg gratings (FBG). We studied the phase mask near field diffraction using the numerical simulation. Our new understanding on the phase mask has critical importance for fabrication of complex FBGs, such as the sampled grating DBR laser, multi-channel dispersion compensator, and phase-shift band-pass filters. In the design of the FBGs we introduced the phase-only sampling multi-channel FBGs using the Dammann diffractive grating, such that the maximum reflective index modulation required for N channels is only √N times of that for the single channel. We apply the discrete layer-peeling algorithm directly design the multi-channel FBGs, whose seed grating contains abrupt phase jumps in order to correct the channel distortions in the sampled multi-channel complex gratings. In addition, we introduced the iterative layer-peeling algorithm as a generic approach for the design of the FBGs. Our research provided a foundation of the advanced multichannel complex FBGs technology, which produces FBGs of very high channel count (45 channels and higher).

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Yunlong Sheng, Joshua E. Rothenberg, and Hongpu Li "Design and fabrication of complex fiber Bragg gratings using diffractive optics technology", Proc. SPIE 5642, Information Optics and Photonics Technology, (11 January 2005); https://doi.org/10.1117/12.569816

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KEYWORDS

Fiber Bragg gratings

Phase shift keying

Phase shifts

Modulation

Optical design

Near field optics

Reflectivity

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