Title :
Reduction of AM-induced penalty in DPSK receivers by sum-square demodulation
Author :
Nielsen, T.N. ; Gliese, U. ; Stubkjaer, K.E.
Author_Institution :
Electromagnetics Inst., Tech. Univ. of Denmark, Lyngby, Denmark
fDate :
3/1/1992 12:00:00 AM
Abstract :
A DPSK (differential phase shift keying) demodulator which is insensitive to the amplitude modulation induced by semiconductor optical amplifier phase modulators is proposed. The demodulator consists of only two additional power dividers/combiners, compared to a traditional DPSK demodulator. Analysis shows that the receiver penalty caused by amplitude modulation can be reduced from 2-4 dB to zero. The demodulator is demonstrated in a 2.5-Gb/s DPSK system experiment using an optical amplifier as phase modulator.<>
Keywords :
amplitude modulation; demodulation; optical communication equipment; phase shift keying; receivers; 2.5 Gbit/s; AM-induced penalty; DPSK receivers; power dividers/combiners; semiconductor optical amplifier phase modulators; sum-square demodulation; Amplitude modulation; Demodulation; Differential phase shift keying; Differential quadrature phase shift keying; Optical modulation; Optical receivers; Phase modulation; Power dividers; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
