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Research on Micro-Ring Photodetectors with Flat-Top and Steep-Edge Response for WDM System

Author: ZuoYuanFang
Tutor: RenXiaoMin
School: Beijing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: Photodetector Flat - top steep edges Micro - ring photodetector Micro - ring resonator Series microring photodetector The parallel micro ring detector
CLC: TN929.11
Type: Master's thesis
Year: 2011
Downloads: 43
Quote: 2
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Abstract


The high-speed development of wavelength division multiplexing (WDM) systems require high-performance, integrated, low-cost optoelectronic devices, discrete devices, however, has been unable to meet the above requirements. The having flattened steep edges response light detector organic integration of the filter and photodetector, and has a good wavelength selectivity, and small size, low cost, causing more and more attention. Semiconductor micro-ring resonator as a wavelength selection device, a low cost, high integration. A micro-ring resonator is applied to the light detector is an effective method to achieve the integrated light-receiving device having a wavelength selectivity. The microring optical detector has the advantages of high quantum efficiency, narrow linewidth, compact structure, compared with the vertical cavity structure cavity detector (RCE-PD), without preparation Bragg reflector mirror (DBR) side into the light conducive plane integrated in future large-scale optoelectronic integration (OEIC), dense wavelength division multiplexing (DWDM) optical fiber system has a great prospect. Photodetector parts for WDM systems, as well as micro-ring resonator, and obtained the following results: 1 micro-ring resonator parameters theoretically calculated and simulation: mode coupling theory analysis the microring straight waveguide between microring and runways type waveguide and the straight waveguide coupling efficiency between the transmission spectra of single micro-ring resonator structure, series micro-ring resonator structure and parallel micro-ring resonator structure; using the transfer matrix method. And the development of micro-ring filter. The study showed that the cascade microring flattened steep edges of the filter characteristic can be obtained. Proposed a new type of photodetector - series micro-ring resonator type flat-top steep edge photodetector. The device consists of four micro-ring resonator in series, the absorbing layer in the last micro-ring resonator. By designing the coupling coefficient between the waveguides, the structure can achieve flattened steep edge Response. Theoretical studies have shown that, under ideal conditions, the quantum efficiency of 98.85%,-0.5dB,-3dB,-20dB bandwidth of 0.4 nm, 0.48nm, 1.2nm, free spectral range of 53nm, in line with the requirements of WDM system. Compared with the single micro-ring photodetector, the device has a high quantum efficiency, wide free spectral range advantages, its spectral response to achieve a flat top and steep edge features. 3 proposed a new type of light detector - parallel micro-ring resonator-type flat-top steep side photodetector. The device three micro-ring resonator in parallel as a filter cavity, a waveguide detector integrated following a runway-type resonator. By design adjacent the straight waveguide distance between microring, the structure may be steep edges flattened response. Theoretical studies show that in the ideal state, the quantum efficiency of 99.8%,-0.5dB,-3dB,-20dB bandwidth 0.3nm, 0.32nm, 0.5nm, in line with the requirements of the WDM system. Compared with the single micro-ring photodetector, the device has the advantages of high quantum efficiency, response line width, its spectral response to achieve a flat top and steep edge features. 4, designed integrated photodetector based on InP / InGaAsP microring monolithic materials, the completion of the design of the the device epitaxial material growth of the territory, and the preparation process of exploration. In order to improve the coupling efficiency between the waveguides, the micro-ring structure uses runway type resonator cavity; vertically coupled between the waveguide and the active layer. 5, experimental test platform structures, fiber and waveguide coupled micro-ring resonator devices tested. The experimental results for the micro ring and the straight waveguide coupling efficiency was 16%, and the optical fiber and the waveguide coupling efficiency is 38%. And the detector response curve and the coupling efficiency of the fiber and waveguide analysis, to lay the foundation for the further study of the micro-ring light detector.

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