Phase-diversity hybrid optimization in case of a two-detector receiver
- 1 September 1992
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Photonics Technology Letters
- Vol. 4 (9) , 1060-1062
- https://doi.org/10.1109/68.157149
Abstract
The performance of two-detector phase-diversity circuits is investigated in the case of restricted local oscillator power. A 120 degrees hybrid with 33.3% throughput is found to be optimum for CPFSK, while a 90 degrees hybrid with 29.3% throughput is optimum for ASK and DPSK. The sensitivities of these hybrids are 1.87 and 1.37 dB, respectively-better than that of the conventional 90 degrees /25% hybrid. The novel 90 degrees /29.3% hybrid can be implemented as a partially symmetric 3*3 coupler or as a polarization-type phase-diversity hybrid.Keywords
This publication has 12 references indexed in Scilit:
- Balanced 3×3 port phase diversity receiver with reduced impact of thermal noiseElectronics Letters, 1990
- Scattering matrix analysis of 3*3 fiber couplersJournal of Lightwave Technology, 1989
- Integrated optics 90° hybrid on LiNbO 3 for phase diversity receiversElectronics Letters, 1988
- New FSK phase-diversity receiver in a 150 Mbit/s coherent optical transmission systemElectronics Letters, 1988
- All-fiber 90° optical hybrid for coherent communicationsApplied Optics, 1987
- Quadrature outputs from fiber interferometer with 4 × 4 couplerOptics Letters, 1986
- Multiport homodyne detection near the quantum noise limitOptical and Quantum Electronics, 1986
- Possible fused fibre in-phase/quadrature measuring multiportElectronics Letters, 1985
- Demodulation of optical DPSK using in-phase and quadrature detectionElectronics Letters, 1985
- Analysis of fiber interferometer utilizing 3 × 3 fiber couplerIEEE Journal of Quantum Electronics, 1982