In this paper, self-phase modulation (SPM) effect in cascaded Mach-Zehnder Interferometers (MZIs) is studied thoroughly, first in single stage and then in multi-stages. Its application in all-optical self-synchronization is proposed. The SPM effect in cascaded MZIs is strengthened by assisting semiconductor optical amplifiers (SOAs), making the proposal simple, integrable and needing no special marker pulses. Furthermore, corresponding system performance is examined and advice is given on the designing of key system parameters.
In this paper, we propose a novel all-optical AND gate using frequency shift accompanied by cross-phase modulation in semiconductor optical amplifier. Theoretical model is built to analyze the performance of the proposed gate. Through numerical simulations, we find the bandwidth of the optical band filter can be optimized to improve the quality of the output signals. The AND gate with short pulse-width and high energy of the control signals is adaptive to high-speed optical packet-switched and label-switched network.
In this paper, for the first time, we analyze the optical exclusive OR (XOR) gate based on cross-polarization modulation (XPolM) effect in semiconductor optical amplifier (SOA) using nonlinear polarization rotation (NPR) theory. The extinction ratio (ER) of optical XOR gate, which reflects the performance of the gate, is calculated in consideration of the injected current, the length and the polarization angle of input signals of the SOA. The performance of the optical XOR gate can be optimized for some proper parameters of the SOA.
A novel serial scheme of header extraction for optical unslotted networks using SOA-MZI with differential modulation scheme was proposed in this paper for the first time. Numerical analysis and simulation show, that more than 15dB contrast ratio of the separated header at 2.5Gbit/s to the suppressed payload at 40Gbit/s could be achieved. In addition, the SOA-MZI parameters are discussed and designed to optimize the performance of the proposed scheme.
Proposed in this paper is a novel packet-level self-synchronization scheme with Semiconductor optical amplifier based symmetric Mach-Zehnder interferometer (SOA-MZI). The effect of cross-phase modulation (XPM) and cross-gain modulation (XGM) in SOA and the interfering characteristics of MZI are combined to make the proposal simple, fast and integrable, with no special treatment of the marker pulses. Through numerical analysis and properly design of the parameters, more than 20dB intensity contrast ratio of 100G/s RZ pseudorandom bit sequence can be achieved.
In this paper, the all-optical logic exclusive OR using integrated SOA-based Mach-Zehnder interferometer with differential modulation scheme is proved to exceed the operation speed limit of the logic XOR with original modulation effectively through numerical analysis for the first time. The SOA Parameters, the signal parameters and the time delay are discussed and designed to optimize the switching performance of the proposed logic XOR. The operation of the proposed logic XOR with 80Gb/s RZ pseudorandom bit sequences is simulated with fairly high performance.
Proposed in this paper is a novel packet-level self-synchronization scheme for slotted optical packet-switched networks (OPNs), where a clock denoting the beginning of each packet is extracted to perform address recognition, ultra-fast optical sampling, or payload delineation. The effect of self-phase modulation (SPM) in semiconductor optical amplifier (SOA) and the interfering characteristics of Mach-Zehnder Interferometer (MZI) are combined to make the proposal simple, fast and integrable, with no special treatment at wavelengths, polarization, intensity, or bit-period of the marker pulses.
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