Citation: Duan P X, Chen L G, Zhang S J, et al. All-optical 2R regeneration based on self-induced polarization rotation in a single semiconductor optical amplifier. An all-optical 2R regeneration based on self-induced polarization rotation in a single semiconductor optical amplifier is presented. A theoretical model is built up to simulate the system performance. Experiment evidence is also provided. An extinction ratio improvement of 8.3 dB is obtained at a bit-rate of 10 Gbit/s. In the BER measurements, 6 dB improvement of the power penalty is achieved, clearly demonstrating the feasibility of the proposed scheme. Our approach has a simple structure, and allows photonic integration.optical fiber communication, optical signal processing, optical regeneration, nonlinear polarization rotation, semiconductor optical amplifier Optical 2R regeneration (Re-amplifying and Re-shaping), which can regenerate the transmitted optical signal in all-optical domain, is attractive for the high-speed optical networks [1] . In the 2R generation technologies, semiconductor-based technologies are particularly promising because of the high nonlinear efficiency and the capability for large-scale integration [1] . Several techniques have been proposed and demonstrated. 2R regeneration was realized by using a Mach-Zehnder interferometer [2] or a Michelson interferometer [3] , respectively. The interferometric transfer function is used as a threshold decision gate. This scheme requires two semiconductor optical amplifiers (SOAs) located in two arms of the interferometer, causing a complicated structure. 2R regeneration can also be realized by using Four-Wave Mixing in an SOA [4] , but this scheme has a low optical signal-to-noise ratio and requires high operating optical power. In addition, an SOA and an electro-absorber are utilized for 2R regeneration [5][6][7][8] , where cross-gain compression in an SOA is used to suppress the noise at "1"-level, saturable absorption in the absorber is used to suppress the noise at "0"-level.Integration version of this concept was presented [8] . This structure has a complicated configuration and the absorber induces a considerable loss.In this paper, we propose a concept that can realize all-optical 2R regeneration using a single SOA. This concept is based on self-induced polarization rotation in an SOA, utilizing the birefringence effects of the SOA. We build up a numerical model to simulate the static and dynamic performance of the proposed 2R regenerator. The experimental investigation is also conducted. The simulation and experiment results are in good agreement, and show that our scheme has similar performance as an optical interferometer but with much simpler configuration. We demonstrated 6 dB improvement of the power penalty at a bit-rate of 10 Gbit/s, clearly verifying the feasibility of this technique. Our approach has a simple structure, and allows photonic integration.
A novel all-optical sampling based on nonlinear polarization rotation in a semiconductor optical amplifier is presented. An analog optical signal and an optical pulses train are injected into semiconductor optical amplifier simultaneously, and the analog light modulates the output optical pulse through controlling the rotated angle of nonlinear polarization rotation of the optical pulse. Therefore, the sampling signals are delivered from the analog light to the optical clock pulses. The theoretical model is built up with polarization-dependent rate-equations. The experimental results at 40 GS/s demonstrate the feasibility of our proposed approach.
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