发明申请
- 专利标题: COHERENT OPTICAL RECEIVER, APPARATUS AND METHOD FOR DETECTING INTER-CHANNEL SKEW IN COHERENT OPTICAL RECEIVER
- 专利标题(中): 相关的光接收机,检测相干光接收机中的通道间的方法
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申请号: US13505199申请日: 2011-09-02
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公开(公告)号: US20120237202A1公开(公告)日: 2012-09-20
- 发明人: Junichi Abe , Wakako Yasuda , Kiyoshi Fukuchi
- 申请人: Junichi Abe , Wakako Yasuda , Kiyoshi Fukuchi
- 申请人地址: JP Tokyo
- 专利权人: NEC CORPORATION
- 当前专利权人: NEC CORPORATION
- 当前专利权人地址: JP Tokyo
- 优先权: JP2011-019612 20110201
- 国际申请: PCT/JP2011/070541 WO 20110902
- 主分类号: H04B10/08
- IPC分类号: H04B10/08
摘要:
In a coherent optical receiver, sufficient demodulation becomes impossible and consequently receiving performance deteriorates if an inter-channel skew arises, therefore, a coherent optical receiver according to an exemplary aspect of the invention includes a local light source, a 90° hybrid circuit, an optoelectronic converter, an analog to digital converter, and a digital signal processing unit; wherein the 90° hybrid circuit makes multiplexed signal light interfere with local light from the local light source, and outputs a plurality of optical signals separated into a plurality of signal components; the optoelectronic converter detects the optical signals and outputs detected electrical signals; the analog to digital converter quantizes the detected electrical signals and outputs quantized signals; the digital signal processing unit includes a skew compensation unit for compensating a difference in propagation delay between the plurality of signal components, and an FFT operation unit for performing a fast Fourier transform process on the quantized signals; and wherein the difference in propagation delay is calculated on the basis of a plurality of peak values with a central focus on one peak value in the results of performing the fast Fourier transform process.