Title :
Performance of DPSK and CPFSK systems with significant post-detection filtering
Author :
Jacobsen, Gunnar
Author_Institution :
Tele Danmark Res. Lab., Horsholm, Denmark
fDate :
10/1/1993 12:00:00 AM
Abstract :
A rigorous model for preamplifier implemented DPSK and CPFSK systems with delay-detection and postdetection filtering is presented. The system performance is impaired by amplifier spontaneous emission noise as well as laser phase noise. A best sensitivity for the system is 20 (DPSK) and 36 (CPFSK) received signal photons for a 10-9 bit error probability. It is found that, using the CPFSK system, significant amounts of phase noise can be tolerated provided that sufficient bandpass bandwidth is allocated and a large modulation index value is used. A linewidth as large as five times the bit rate causes only a 4.2-dB penalty for a receiver employing polarization control and a 5.3-dB penalty for a polarization diversity receiver
Keywords :
frequency shift keying; noise; optical modulation; optical receivers; phase shift keying; probability; sensitivity; superradiance; CPFSK systems; DPSK; amplifier spontaneous emission noise; bandpass bandwidth; bit error probability; delay-detection; large modulation index value; laser phase noise; linewidth; polarization control; polarization diversity receiver; post-detection filtering; postdetection filtering; preamplifier implemented CPFSK systems; preamplifier implemented DPSK systems; received signal photons; rigorous model; Delay systems; Differential quadrature phase shift keying; Filtering; Laser modes; Laser noise; Phase noise; Polarization; Preamplifiers; Spontaneous emission; System performance;
Journal_Title :
Lightwave Technology, Journal of
