A Frequency Domain Systems Theory Perspective for Semiconductor Optical Amplifier - Mach Zehnder Interferometer Circuitry in Routing and Signal Processing Applications (original) (raw)
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International Journal of Computer Applications Ijca, 2010
Optics has been used in computing for a number of years but the main emphasis has been and continues to be to link portions of computers, for communications, or more intrinsically in devices that have some optical application or component. Optical digital computers are still some years away; however a number of devices that can ultimately lead to real optical computers have already been manufactured. The most likely near-term optical computer will really be a hybrid composed of traditional architectural design along with some portions that can perform some functional operations in optical mode. In this paper design of Mach-Zehnder interferometer is shown which works as a switch. This switch can be used in designing the optical memories as well as in add-drop multiplexers. The interferometer employs bidirectional couplers and semiconductor optical amplifier in one of its arms. Interferometer acts as a very high speed switch, since it does not need any conversation from optical to electronic and vice versa.
2012
A new method for increasing speed of all-optical Mach-Zehnder Interferometric (MZI) switching with bulk semiconductor optical amplifier (SOA), by use of chirped control signals, is suggested and theoretically analyzed. For 125 fs input and chirped control pulses, we show acceleration of gain recovery process using cross phase modulation (XPM) effect. Our method depicts that Tbls switching speeds using bulk SOA-MZI with proper Q-factor is feasible. For the first time we reach operation capability at 2Tb/s with a Q-factor more than 10. The new scheme also improves the extinction and amplitude ratio of the output power as well as increases the contrast ratio of the switched signal. We use finite difference beam propagation method for MZI analysis, taking into account all nonlinear effects of SOA such as group velocity dispersion (GVD), Kerr effect, two photon absorption (TPA), carrier heating (CH) and spectral hole burning (SHB).
Tb/s all-optical nonlinear switching using SOA based Mach-Zehnder interferometer
A new method for increasing the speed of all-optical Mach-Zehnder Interferometric (MZI) switching with a bulk Semiconductor Optical Ampli er (SOA), using chirped control signals, is suggested and theoretically analyzed. For 125fs input and chirped control pulses, we show acceleration of the gain recovery process using the cross phase modulation (XPM) e ect. Our method depicts that Tb/s switching speeds, using bulk SOA-MZI with a proper Q-factor, is feasible. For the rst time, we reach operation capability at 2Tb/s with a Q-factor of more than 10. The new scheme also improves the extinction and amplitude ratio of the output power, as well as increasing the contrast ratio of the switched signal. We use a nite di erence beam propagation method for MZI analysis, taking into account all nonlinear e ects of SOA, such as Group Velocity Dispersion (GVD), Kerr e ect, Two Photon Absorption (TPA), Carrier Heating (CH) and Spectral Hole Burning (SHB).
Recipe for intensity modulation reduction in SOA-based interferometric switches
IEEE/OSA Journal of Lightwave Technology, 2004
This paper presents a theoretical and experimental analysis of saturated semiconductor optical amplifier (SOA)-based interferometric switching arrangements. For the first time, it is shown that such devices can provide enhanced intensity modulation reduction to return-to-zero (RZ) formatted input pulse trains, when the SOA is saturated with a strong continuous-wave (CW) input signal. A novel theoretical platform has been developed in the frequency domain, which reveals that the intensity modulation of the input pulse train can be suppressed by more than 10 dB at the output. This stems from the presence of the strong CW signal that transforms the sinusoidal transfer function of the interferometric switch into an almost flat, strongly nonlinear curve. This behavior has also been verified experimentally for both periodically and randomly degraded, in terms of intensity modulation, signals at 10 Gb/s using the ultrafast nonlinear interferometer as the switching device. Performance analysis both in the time and frequency domains is demonstrated, verifying the concept and its theoretical analysis.
Journal of Computational Electronics, 2018
The performance of an all-optical OR gate using a dual pump-probe semiconductor optical amplifier (SOA)-assisted Mach-Zehnder interferometer (MZI) is investigated and demonstrated through numerical simulations at a data rate of 80 Gb/s. The proposed scheme enables to obtain a higher quality factor and smaller pattern dependence for a more feasible choice of critical operating parameters than when using for the same purpose the SOA-delayed interferometer. Keywords All-optical OR gate • Semiconductor optical amplifier • Mach-Zehnder interferometer • Dual pump-probe scheme 1 Introduction Boolean OR is one of the basic logic operations in the suite of fundamental binary functions [1]. In particular, its execution exclusively by means of light is desirable for enabling all-optical (AO) signal processing tasks in both fundamental and system-oriented level [2]. In line with the progress on AO logic circuits and subsystems achieved owing to semiconductor optical amplifier's (SOA) attractive properties, the implementation of the specific gate and the investigation of its performance have largely been addressed based on this technology [3-6]. To this aim, SOAs have been exploited either with a delayed interferometer (SOA-DI) [7-10] or in the conventionally driven Mach-Zehnder interferometer
Journal of Lightwave Technology, 2002
We have investigated three interferometric all-optical switches based on cross-phase modulation (XPM) in semiconductor optical amplifiers (SOAs), the semiconductor laser amplifier in a loop mirror (SLALOM) switch, the Mach-Zehnder interferometer (MZI) switch, and the ultrafast nonlinear interferometer (UNI) switch. Switching windows with different widths are measured under similar conditions for all three switching configurations. We introduce the integrated contrast ratio (ICR) as a measure to evaluate the performance of a switch from switching windows. Using the ICR, the switches are compared and their application is discussed as demultiplexer in optical time division multiplexing (OTDM) systems for data rates of 40, 80, and 160 Gb/s.