Title:
遅延復調デバイス
Document Type and Number:
Japanese Patent JP4558814
Kind Code:
B2
Abstract:
The delay demodulation device 1 comprises an input waveguide 2 which receives DQPSK signals; a Y-branch waveguide 3 which splits the light waveguide 2; a first Mach-Zehnder interferometer (MZI) 4; and a second Mach-Zehnder interferometer 5. Both ends of the arm-waveguides 8, 9 of the MZI 4 and the both ends of the arm-waveguides 12, 13 of the MZI 5 are bent toward the center portion of the planar lightwave circuit (PLC) 1A. Thereby, the length of the arm-waveguides 8, 9 of the MZI 4 and the length of the arm-waveguides of the MZI 5 are shortened in the Z-direction. And, the length of the input couplers 6, 10 and the output couplers 7, 11 of the MZIs 4, 5 are shortened in the Z-direction. Therefore, the area covered by the MZIs 4, 5 can be made smaller.
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Inventors:
Junichi Hasegawa
Kazutaka Nara
Kazutaka Nara
Application Number:
JP2008083640A
Publication Date:
October 06, 2010
Filing Date:
March 27, 2008
Export Citation:
Assignee:
THE FURUKAW ELECTRIC CO.,LTD.
International Classes:
G02F1/01; G02F2/00; H04B10/516; H04B10/548; H04B10/61
Domestic Patent References:
| JP2007201939A | ||||
| JP2005010333A | ||||
| JP2003014958A | ||||
| JP2005092217A | ||||
| JP11038239A |
Other References:
NTT技術ジャーナル,2007年11月,Vol.19,No.11,52-57
Journal of Lightwave Technology,2006年 1月,Vol.24,No.1,171-174
Journal of Lightwave Technology,2006年 1月,Vol.24,No.1,171-174
Attorney, Agent or Firm:
Ryo Matsushita