APPARATUS FOR MEASUREMENT OF COHERENT OPTICAL RECEIVER

摘要

PURPOSE: A device for measuring the performance of a coherent light receiver is provided to measure a common mode removal rate directly and accurately. CONSTITUTION: A device for measuring the performance of a coherent light receiver comprises a beam splitter(210), a first optical modulator(221), a variable optical attenuator(230), a second optical modulator(222), a variable optical retarder(240), a first polarization controller, a second polarization controller(252), a network analyzer(260), and a controller(270). The beam splitter splits lights received from a light source into first and second route lights. The first optical modulator receives the first route lights of the beam splitter and performs optical modulation. The variable optical attenuator controls the optical power of the output of the first optical modulator, thereby outputting. The first polarization controller transmits first output signals in which the polarization of the output of the variable optical attenuator is controlled to a coherent light receiver. The second optical modulator receives the second route lights of the beam splitter. The variable optical retarder outputs the output of the second optical modulator by delaying the time of the output of the second optical modulator. [Reference numerals] (210) Beam splitter; (221) First optical modulator; (222) Second optical modulator; (230) Variable optical attenuator; (240) Variable optical retarder; (251) First polarization controller; (252) Second polarization controller; (260) Network analyzer; (270) Controller; (AA) Electric signal