发明授权
US06678086B2 Bit-rate and format insensitive all-option clock extraction circuit
有权
比特率和格式不灵敏的全光时钟提取电路
- 专利标题: Bit-rate and format insensitive all-option clock extraction circuit
- 专利标题(中): 比特率和格式不灵敏的全光时钟提取电路
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申请号: US10195766申请日: 2002-07-15
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公开(公告)号: US06678086B2公开(公告)日: 2004-01-13
- 发明人: Bharat Dave , Doruk Engin , Kwang Kim , Mohammad Laham , Julio Martinez , Olga Nedzhvetskaya , Jithamithra Sarathy , Ronald Simprini , Boris Stefanov , Tan Buu Thai
- 申请人: Bharat Dave , Doruk Engin , Kwang Kim , Mohammad Laham , Julio Martinez , Olga Nedzhvetskaya , Jithamithra Sarathy , Ronald Simprini , Boris Stefanov , Tan Buu Thai
- 主分类号: G02F135
- IPC分类号: G02F135
摘要:
A method and circuit are presented for the all optical recovery of the clock signal from an arbitrary optical data signal. The method involves two stages. A first stage preprocesses the optical signal by converting a NRZ signal to a PRZ signal, or if the input optical signal is RZ, by merely amplifying it. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The output of the preprocessing stage is fed to a clock recovery stage, which consists of a symmetric interferometer that locks on to the inherent clock signal by using the second stage input signal to trigger two optical sources to self oscillate at the clock rate. In a preferred embodiment the second stage is implemented via SOAs integrated in the arms of an interferometer, with two DFB lasers as terminuses. The output of the interferometer is an optical clock signal at the clock rate of the original input.