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Study of Multi-electrode SOA Saturation Power and Its Drive and Control System Design

Author: YuShengHui
Tutor: HuangDeXiu
School: Huazhong University of Science and Technology
Course: Optical Engineering
Keywords: Semiconductor optical amplifier Multi-electrode Saturation power Constant current drive Constant temperature control
CLC: TN253
Type: Master's thesis
Year: 2009
Downloads: 17
Quote: 0
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Abstract


Because of its compactness, potentially low cost and easy to integrate with other optoelectronic devices, semiconductor optical amplifier(SOA) is widely used in optical fiber communication system. The main areas of its application can be divided into two types: one is to use its linear amplification in optical fiber communication system as boost amplifiers, inline amplifiers and pre-amplifiers; the other is to make use of its non-linear effects, used in All-optical signal processing, such as wavelength converters, photonic switches, all-optical logic devices. In these two types of applications mentioned above, the saturation power of SOA is different as the request.In order to adapt to various requirements of saturation power in different applications, multi-electrode SOA can be used. Based on the carrier density rate equation and photon propagation equation, the multi-section model of SOA has been presented to study the saturation power in this thesis. The saturation power of single-electrode SOA, under different injected current and different cavity length has been studied. Then, the saturation power of multi-electrode SOA under different injected current ratio and cavity length ratio, is emphatically studied. It’s found that the saturation power can be adjusted continuously by changing the injected current of the second electrode in the two-electrode SOA. It is also found that the two-electrode SOA with bigger optical confinement factor in the first electrode and smaller one in the second electrode can achieve a high saturation output power and the small signal gain is not decreased.In addition to study on saturation characteristics, the drive and temperature control system for multi-electrode SOA is also designed and constructed. It’s suitable for multi -electrode SOA to achieve constant current drive and precision temperature control. The maximum drive current of the single electrode is up to 800mA. The temperature can be controlled at 15~50℃with accuracy of 0.05℃. The system control circuit based on ATmega16 can provide over-current and over-temperature protection.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Photonics technology,laser technology > Optical waveguide and integrated optics > Fiber optic components
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