All-optical error-bit amplitude monitor based on NOT and AND gates in cascaded semiconductor optical amplifiers |
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Authors: | Dong Jian-Ji Zhang Xin-Liang and Huang De-Xiu |
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Institution: | Wuhan National Laboratory for Optoelectronics, School of
Optoelectronic Science and Engineering, Huazhong University of
Science and Technology, Wuhan 430074, China |
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Abstract: | This paper proposes and simulates a novel all-optical error-bit
amplitude monitor based on cross-gain modulation and four-wave
mixing in cascaded semiconductor optical amplifiers (SOAs), which
function as logic NOT and logic AND, respectively. The proposed
scheme is successfully simulated for 40\,Gb/s return-to-zero (RZ)
signal with different duty cycles. In the first stage, the SOA is
followed by a detuning filter to accelerate the gain recovery as
well as improve the extinction ratio. A clock probe signal is used
to avoid the edge pulse-pairs in the output waveform. Among these RZ
formats, 33{\%} RZ format is preferred to obtain the largest eye
opening. The normalized error amplitude, defined as error bit
amplitude over the standard mark amplitude, has a dynamic range from
0.1 to 0.65 for all RZ formats. The simulations show small input
power dynamic range because of the nonlinear gain variation in the
first stage. This scheme is competent for nonreturn-to-zero format
at 10Gb/s as well. |
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Keywords: | semiconductor optical amplifier nonlinear optics optical communications devices |
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