Title :
Phase-diversity hybrid optimization in case of a two-detector receiver
Author :
Van Deventer, M. Oskar
Author_Institution :
PTT Res., Leidschendam, Netherlands
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 :
amplitude shift keying; diversity reception; frequency shift keying; optical receivers; phase shift keying; ASK; CPFSK; DPSK; hybrid optimization; partially symmetric 3*3 coupler; phase-diversity circuits; polarization-type phase-diversity hybrid; restricted local oscillator power; sensitivities; two-detector receiver; Computer aided software engineering; Detectors; Local oscillators; Optical noise; Optical polarization; Optical receivers; Optical scattering; Phase detection; Phase noise; Throughput;
Journal_Title :
Photonics Technology Letters, IEEE
