Title :
Performance analysis of coherent optical phase-diversity receivers with DPSK modulation
Author :
Nicholson, Grant ; Stephens, Tom D.
Author_Institution :
Telecom Australia Res. Lab., Clayton, Vic., Australia
Abstract :
The transmission performance of two phase-diversity receiver structures using a six-port fiber coupler is investigated for coherent optical communication systems with differential phase-shift-keying (DPSK) modulation. A general method for evaluating the error probability of phase-diversity DPSK receivers using delay-and-multiply demonstrators is derived. The method is used to show that, in the shot-noise limited case, the performance of the phase-diversity DPSK receivers is close to that achievable with a heterodyne receiver, provided the frequency offset between lasers is less that about 1% of the bit rate. The allowable total laser linewidth is in the range of 0.3-0.4% of the bit rate.<>
Keywords :
optical communication equipment; optical couplers; optical fibres; phase shift keying; receivers; DPSK modulation; delay-and-multiply demonstrators; differential phase-shift-keying; error probability; frequency offset; heterodyne receiver; phase-diversity receiver structures; shot-noise limited case; six-port fiber coupler; total laser linewidth; transmission performance; Bit rate; Differential quadrature phase shift keying; Optical coupling; Optical fiber communication; Optical fiber couplers; Optical mixing; Optical modulation; Optical receivers; Performance analysis; Phase shift keying;
Journal_Title :
Lightwave Technology, Journal of
