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28 November 2011All-optical edge detector for NRZ signal using a SOA-MZI
We propose an all-optical edge detector for the high-speed non-return-to-zero (NRZ) signals by employing a
Mach-Zehnder interferometer (MZI) incorporating semiconductor optical amplifiers (SOAs), where the cross phase
modulation (XPM) in SOA is exploited. The basic working principle of the proposed edge detector is that the CW probes
in the upper and bottom arms always undergo a phase difference of π, except during the leading and tailing transition
edges of the NRZ signals. Therefore, the output after the two probes interfering at the constructive port of the MZI will
be a series of pulses at only the edges of the NRZ signals. The output signals of the edge detectors are numerically
evaluated in terms of the Q factor (>20dB) and extinction ratio (>11dB) at 20 and 40 Gb/s, which indicate the high
quality of output.
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Qiwei Weng, Gang Wang, Xuelin Yang, Weisheng Hu, "All-optical edge detector for NRZ signal using a SOA-MZI," Proc. SPIE 8308, Optoelectronic Materials and Devices VI, 830807 (28 November 2011); https://doi.org/10.1117/12.904097