Title:
POLARIZATION CONTROL CIRCUIT
Document Type and Number:
Japanese Patent JP3443810
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a means for executing polarization diversity by a simple optical circuit without executing intricate electric circuit processing in the case where coherent detection is executed in optical communication or optical measurement, etc.
SOLUTION: This polarization control circuit has a polarization separation type beam splitter 1, a light intensity detecting means 2, a comparator circuit 7, a polarization plane rotating element 8 and a Mach-Zehunder type interferometer 9 including a phase shifter 15 and makes only the one component of the two components separated in the beam splitter 1 as the output from the Mach- Zehunder type interferometer 9 by changing the phase shift quantity in the phase shifter 15 according to the result of comparison of the light intensity. Further, the control circuit may have a laser beam source for outputting the light wave having the same linearly polarized light as the one component, an optical multiplexing for multiplexing the output light wave of a polarized wave control circuit and the output light wave from a laser beam source and a light signal receiver for converting the output light signal of this optical multiplexer to an electric signal.
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| WO/2001/090803 | OPTICAL ADD/DROP MULTIPLEXER |
Inventors:
Kaoru Shimizu
Tsuneo Horiguchi
Tsuneo Horiguchi
Application Number:
JP8779896A
Publication Date:
September 08, 2003
Filing Date:
April 10, 1996
Export Citation:
Assignee:
Nippon Telegraph and Telephone Corporation
International Classes:
G02F1/01; G02F2/00; H04B10/07; H04B10/27; H04B10/29; (IPC1-7): G02F2/00; G02F1/01; H04B10/02
Domestic Patent References:
| JP8248358A | ||||
| JP7183841A | ||||
| JP3148641A |
Attorney, Agent or Firm:
Kosaku Sugimura