Title :
Active controlled fiber optical 90 degrees hybrid for coherent communications
Author :
Berenbrock, Goetz A. ; Schlemmer, Bernd
Author_Institution :
Lehrstuhl fur Allegmeine Elektrotech. und Elektroop., Ruhr-Univ. Bochum, West Germany
fDate :
4/1/1989 12:00:00 AM
Abstract :
A description is given of a lossless, active controlled fiber-optic 90 degrees -hybrid coupler consisting of four fiber couplers for use in a phase-diversity receiver. The four output signals are proportional to E/sub 1/+or-E/sub 2/ and E/sub 1/+or-E/sub 2/*exp(j90 degrees ), where E/sub 1/ and E/sub 2/ are the complex amplitudes of the two input signals. The hybrid comprising four 3-dB monomode fiber couplers and two phase shifters was designed for the 1.5- mu m wavelength range. The principle of operation is described and experimental results are presented. The maximum phase error is smaller than 0.5.<>
Keywords :
optical communication equipment; optical couplers; optical fibres; phase shifters; 1.5 micron; 3 dB; coherent communications; complex amplitudes; lossless active controlled fibre optical 90 degrees hybrid coupler; maximum phase error; monomode fiber couplers; output signals; phase shifters; phase-diversity receiver; Baseband; Communication system control; Frequency; Optical control; Optical fiber communication; Optical fiber couplers; Optical fiber polarization; Optical mixing; Optical receivers; Optical sensors;
Journal_Title :
Photonics Technology Letters, IEEE
