Temporal coherence of chaotic light with dynamically fluctuating in the state of polarization out of a fiber ring laser
based on semiconductor optical amplifier (SOA) is investigated. The coherence of the chaotic light is verified by
employing Sagnac interferometer, and only the zero-order coherence is observed. Visibility of interference streak is
measured in different optical path differences by M-Z interferometer and coherence time of the chaotic laser with 40ps is
obtained. Spectrum of the chaotic laser is measured, which is almost the same as that of normal laser light. According to
the spectrum, coherence length of the chaotic light is 13mm, then, the coherence time is 43ps, which is basically
consistent with the time of 40ps obtained from the experiment. Also it is got that temporal coherence of the chaotic light
is independent on current of SOA by experiment. Finally, the superiority of chaos laser's coherence in resolution and
sensitivity is indicated when it is applied to the field of low coherence optical source detection.
An optical secure communication system based on digital chaos and Polarization Shift Keying (PolSK) technology is
proposed. In several selected PolSK schemes, states of polarization are partially or totally uniform on Poincare sphere.
Different PolSK schemes are chosen according to the real-time chaos-based pseudo-random sequences to modulate
original information in different periods of clock of the transmitter. In the receiver, according to the synchronous chaotic
sequences, corresponding PolSK schemes are used to demodulate the information. Simulation is carried out by using the
softwares of OptiSystem and Matlab. Some analysis results are presented. In the conclusion, this system works well in
communication and has strong anti-attack capacity.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.