Cascaded SOA configuration for NRZ-OOK to RZ-QPSK format conversion |
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| Authors: | Y Gao C Shu S He |
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| Institution: | a Centre for Optical and Electromagnetic Research, State key Laboratory for Modern Optical Instrumentation, Zhejiang University, Zijingang Campus, Hangzhou, 310058, Chinab Department of Electronic Engineering, Center for Advanced Research in Photonics, The Chinese University of Hong Kong, Shatin, Hong Kong, Chinac Joint Centre of Advanced Photonics Research of the Chinese University of Hong Kong and Zhejiang University, China |
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| Abstract: | We propose and experimentally demonstrate an all-optical format conversion from two independent non-return-to-zero on-off keying (NRZ-OOK) signals to a return-to-zero quadrature phase shift keying (RZ-QPSK) signal using two cascaded SOAs. Within each SOA, the cross phase modulation (XPM) process is properly controlled by an assistant light. After evaluating its effect on XPM, a suitable power range of assistant light is chosen for the NRZ-OOK to RZ-QPSK format conversion. In the experiment, a RZ-QPSK signal is successfully obtained with opened demodulation eye-diagrams. |
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| Keywords: | Quadrature phase-shift keying (QPSK) Semiconductor optical amplifier (SOA) Wavelength-division multiplexing (WDM) Optical fiber communication |
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