Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China
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.
Received: 15 February 2008
Revised: 30 April 2008
Accepted manuscript online:
Fund: Project partially
supported by the National High Technology Developing Program of
China (Grant No 2006AA03Z0414), the National Basic Research Program
of China (Grant No 2006CB302805), the Science Fund for Distinguished
Young Scholars of Hubei Province, China (Grant No 2006ABB017), and
the Program for New Century Excellent Talents in Ministry of
Education of China (Grant No NCET-04-0715).
Cite this article:
Dong Jian-Ji (董建绩), Zhang Xin-Liang (张新亮), Huang De-Xiu (黄德修) All-optical error-bit amplitude monitor based on NOT and AND gates in cascaded semiconductor optical amplifiers 2008 Chin. Phys. B 17 4226
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