发明授权
US06961522B1 Automatic raman gain and tilt control for ultra-long-distance dense WDM optical communication system
失效
超长距离密集WDM光通信系统的自动拉曼增益和倾斜控制
- 专利标题: Automatic raman gain and tilt control for ultra-long-distance dense WDM optical communication system
- 专利标题(中): 超长距离密集WDM光通信系统的自动拉曼增益和倾斜控制
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申请号: US09717036申请日: 2000-11-22
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公开(公告)号: US06961522B1公开(公告)日: 2005-11-01
- 发明人: Roberta Castagnetti , Fabrizio Di Pasquale , Giorgio Grasso , Fausto Meli , Giovanni Sacchi
- 申请人: Roberta Castagnetti , Fabrizio Di Pasquale , Giorgio Grasso , Fausto Meli , Giovanni Sacchi
- 申请人地址: US CA San Jose
- 专利权人: Cisco Technology, Inc.
- 当前专利权人: Cisco Technology, Inc.
- 当前专利权人地址: US CA San Jose
- 代理机构: Ritter, Lang & Kaplan LLP
- 主分类号: H04B10/00
- IPC分类号: H04B10/00 ; H04B10/17 ; H04J14/02
摘要:
An approach for automatic Raman gain and tilt control for a WDM (Wavelength Division Multiplexing) optical communication systems is disclosed. An optical fiber carries a plurality of optical signals, in which at least one of the optical signals are reference signals. An optical gain unit (e.g., Raman pump unit) couples to the optical fiber and adjusts the reference signals to compensate, in part, for losses associated with the optical fiber and gain tilt accumulation. Upon detecting and analyzing the reference signals, a controller controls the optical gain unit and outputs a control signal to the optical gain unit based upon the analyzed reference signals. An optical amplifier is connected to the optical fiber and amplifies the optical signals. The optical gain unit provides a nearly constant power per channel at an input of the optical amplifier. Under this approach, a Raman gain control mechanism, combined with the use of gain controlled EDFA (Erbium Doped Fiber Amplifier), allows high transmission capacity over ultra-long distances without optical regeneration and with high flexibility.