发明名称 |
Optical nyquist superchannel generation using microwave low-pass filtering and optical equalization |
摘要 |
Disclosed are structures and methods for generating a Nyquist superchannel. |
申请公布号 |
US9270379(B2) |
申请公布日期 |
2016.02.23 |
申请号 |
US201414218857 |
申请日期 |
2014.03.18 |
申请人 |
NEC Laboratories America, Inc. |
发明人 |
Huang Yue-Kai;Zhang Shaoliang;Yaman Fatih;Qian Dayou |
分类号 |
H04J14/02;H04B10/50;H04B10/2507 |
主分类号 |
H04J14/02 |
代理机构 |
|
代理人 |
Kolodka Joseph |
主权项 |
1. A method of generating a Nyquist superchannel output signal comprising the steps of:
performing Nyguist shaping in two steps: one in a baseband frequency and one in an optical frequency including: filtering an electrical baseband signal with finite rise-time symbols by high-order microwave low pass filter (LPF) such that the baseband signal energy is confined to a small fraction above a Nyquist rate, and no digital-to-analog converters are used for signal generation; upconverting the filtered signal to optical frequencies by applying the filtered signal to and driving an optical modulator substantially in its linear region; demultiplexing a multi-tone optical signal and applying a demultiplexed output to the optical modulator; passively coupling an output from the optical modulator to other outputs from other modulators such that multiple subcarriers are multiplexed at a spacing above their Nyquist bandwidth; and optically equalizing the coupled multiple subcarriers such that the Nyquist superchannel is generated. |
地址 |
Princeton NJ US |