Background
Type: Conference Paper

Shot Noise Optimal Filters for Phase-Diversity Homodyne Receivers

Journal: ()Year: 2024Volume: Issue: Pages: 658 - 663
Sheikhbahaei M.Forouzan A.a
DOI:10.1109/IST64061.2024.10843601Language: English

Abstract

Analytical expressions for the signal to shot noise power ratio (SSNR) of phase diversity homodyne (PDH) optical fiber communication systems with arbitrary waveform and receiver filter are derived. The receiver filter structures maximizing the SSNR is calculated in closed form formulas. The SSNR performance of the systems is evaluated for rectangular and Gaussian pulse shapes and receiver filter structures such as matched filtering, the ideal integrator, and the photodetector RC model. As a side outcome, we show that the SSNR is upper-bounded by twice the converted electrons of the local oscillator. Numerical results show that the proposed optimal filter outperforms the ideal integrator and the integrator plus RC receiver by a few dBs. However, matched filtering to the complex received pulse amplitude is near optimal provided that the local oscillator power is much larger than the received power. © 2024 IEEE.


Author Keywords

Coherent fiber optic communicationsfilter designmatched filteringoptical fiber communicationoptimum receiverphase-diversity homodyne detectionshot noise

Other Keywords

Bandpass filtersGaussian noise (electronic)Homodyne detectionOptical designOptical fiber communicationOptical fibersOptical filtersPhotonicsShot noiseWiener filteringCoherent fiber optic communicationFiber optics communicationFibre-optic communicationFilter designsHomodynesMatched filteringOptical-fiber communicationOptimum receiversPhase-diversityPhase-diversity homodyne detectionMatched filters