摘要 |
A method and circuit are presented for an all-optical format independent preprocessor that processes an arbitrary optical input signal by converting a NRZ signal to a PRZ signal, or if the input optical subtracting a delayed copy of the signal from the original, thereby effectively doubling its frequency, and inserting a pulse at each transition of the original signal, whether rising or falling. In a preferred embodiment this stage is implemented via an integrated SOA in each arm of an asymmetric interferometric device. The asymmetry consists of a delay element in one arm. In a preferred embodiment the entire device is fabricated on a semiconductor substrate, allowing for compactness as well as minimization of interconnectivity losses and overall power consumption. The output of the preprocessor, having a significant frequency component at its original clock rate, can then be fed to a clock recovery stage for all-optical clock recovery. |
申请人 |
ALPHION CORPORATION |
发明人 |
MARTINEZ, JULIO;KIM, KWANG;NEDZHVETSKAYA, OLGA;ENGIN, DORUK;SARATHY, JITHAMITHRA;ANTOSIK, ROMAN;DAVE, BHARAT;EVANS, MICHAEL;LIDSKY, DAVID;SIMPRINI, RONALD;STEFANOV, BORIS;THAI, TAN |