Invention Application
US20080199189A1 COLORLESS OPTICAL DEMODULATOR FOR DIFFERENTIAL QUADRATURE PHASE SHIFT KEYING DWDM SYSTEMS
审中-公开
无差异光学解调器用于差分相位相移键控DWDM系统
- Patent Title: COLORLESS OPTICAL DEMODULATOR FOR DIFFERENTIAL QUADRATURE PHASE SHIFT KEYING DWDM SYSTEMS
- Patent Title (中): 无差异光学解调器用于差分相位相移键控DWDM系统
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Application No.: US11676519Application Date: 2007-02-20
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Publication No.: US20080199189A1Publication Date: 2008-08-21
- Inventor: Lei XU , Philip Nan JI , Jianjun YU , Milorad CVIJETIC , Yutaka YANO , Tsutomu TAJIMA , Shinya NAKAMURA , Ting Wang
- Applicant: Lei XU , Philip Nan JI , Jianjun YU , Milorad CVIJETIC , Yutaka YANO , Tsutomu TAJIMA , Shinya NAKAMURA , Ting Wang
- Applicant Address: US VA HERNDON
- Assignee: NEC AMERICA INC.
- Current Assignee: NEC AMERICA INC.
- Current Assignee Address: US VA HERNDON
- Main IPC: H04J14/00
- IPC: H04J14/00
Abstract:
A colorless optical DQPSK demodulator and system operating over multiple, equally-spaced DWDM channels with fixed optical delays—capable of demodulating DQPSK within signals within DWDM communications wave bands on ITU grids using delay interferometers having fixed free spectral range at 20 GHz or 25 GHz.
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