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The performance of coherent receiver controlled by the phase lock loop in dual rate free-space laser communication
- Source :
- Laser Communication and Propagation through the Atmosphere and Oceans IV.
- Publication Year :
- 2015
- Publisher :
- SPIE, 2015.
-
Abstract
- The technique of differential phase shift keying(DPSK) modulation is applied into demodulating phase information in the coherent optical receiver. The dual rate free-space receiving structure on the base of Mach-Zehnder delay interferometer with the lens is used suitably for differential delay which is equal to the one bit corresponding to a certain data rate. Delay distance at the interference receiver is varied with transmission rata from satellite to ground. Differential information is obtained by the subtraction of the two successive wave-front phases when made to interfere. The phase demodulation is extremely sensitive to phase fluctuation. Because of the incident light through atmospheric turbulence, the wave-front of optical signal became jittered in the temporal and spatial domain rapidly. In the paper, the dual rate free-space laser communication receiver for phase lock to stable signal light phase is proposed, increasing the homodyne efficiency and decreasing the bit error rate.
Details
- ISSN :
- 0277786X
- Database :
- OpenAIRE
- Journal :
- Laser Communication and Propagation through the Atmosphere and Oceans IV
- Accession number :
- edsair.doi...........48ac298d643d3b9ab0c97ebb5cda259f