Silicon-based traveling-wave photodetector array (Si-TWPDA) with parallel optical feeding

Silicon-based traveling-wave photodetector array (Si-TWPDA) with parallel optical feeding
Title:
Silicon-based traveling-wave photodetector array (Si-TWPDA) with parallel optical feeding
Other Titles:
Optics Express
Keywords:
Publication Date:
12 August 2014
Citation:
Xianshu Luo, Junfeng Song, Xiaoguang Tu, Qing Fang, Lianxi Jia, Ying Huang, Tsung-Yang Liow, Mingbin Yu, and Guo-Qiang Lo, "Silicon-based traveling-wave photodetector array (Si-TWPDA) with parallel optical feeding," Opt. Express 22, 20020-20026 (2014) http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-22-17-20020
Abstract:
We demonstrate silicon-based traveling-wave photodetector arrays (Si-TWPDAs) with parallel optical feeding by integrating multiple Germanium photo detectors. Such Si-TWPDAs feature the merit of high optical saturation power with remaining the large operation bandwidth. The impedance-matched traveling-wave electrode design takes into account the individual Ge photo detector loading effect. Optical waveguide delay lines are designed in order to balance the electrical phase delay of the traveling wave electrode. The maximum linear photocurrent at −4V biased voltage are respectively 16 mA, 38 mA, and 65 mA with integrating 1, 2, and 4 photodetectors, upon the saturation power of 40 mW, 100 mW, and 160 mW. This corresponds to a normalized photocurrent generation of >0.32 mA/μm3 and a normalized saturation power of 0.8 mW/μm3. The extracted fiber access responsivity is ~0.42 A/W and the intrinsic responsivity of ~0.82 A/W. The measured 3-dB bandwidth for 4-channel TWPDA is ~20 GHz.
License type:
PublisherCopyrights
Funding Info:
Description:
ISSN:
1094-4087
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