Title:
PHOTODETECTING CIRCUIT
Document Type and Number:
Japanese Patent JPH11167133
Kind Code:
A
Abstract:
To provide a photodetecting circuit which has low loss and makes it easy to adjust the detection current of a balance type by using a multimode optical fiber only on the output side of an optical coupler.
The photodetecting circuit is equipped with an optical multiplexer 1 which multiplexes signal light and local oscillation light, multimode optical fibers 4 and 5, lenses 2 and 3 which couple the output light of the optical multiplexer with the multimode optical fibers, detectors 6 and 7 which detect the output light of the multimode optical fibers 4 and 5, and a differential amplifier 8.
Inventors:
MACHIDA SUSUMU
Application Number:
JP33379597A
Publication Date:
June 22, 1999
Filing Date:
December 04, 1997
Export Citation:
Assignee:
JAPAN SCIENCE & TECH CORP
International Classes:
G02F2/00; H04B10/112; H04B10/516; H04B10/61; (IPC1-7): G02F2/00; H04B10/04; H04B10/06; H04B10/142; H04B10/152
Attorney, Agent or Firm:
Shimizu Mamoru