Abstract
Multiport detection,1,2 which includes in-phase and quadrature detection, is capable of giving a performance comparable with that of standard heterodyne detection with the advantage of using much smaller receiver bandwidths; this becomes a significant advantage at gigabit data rates. The principles were first demonstrated in a system which contained a 3 × 3 combiner,2 but it is anticipated that, if this is replaced by a 90° optical hybrid,3 the performance will be improved and the postdetection processing needed will be reduced. A gas laser self-homodyne 140-Mbit/s DPSK experiment has shown the feasibility of using an optical hybrid to achieve in-phase and quadrature detection4 and this paper updates this work and reports, for the first time, an optical hybrid receiver which uses separate external cavity semiconductor lasers for the transmitter and local oscillator, tor.
© 1986 Optical Society of America
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