GaAs-based long-wavelength traveling-wave photodetector

JinWei Shi; Chi-Kuang Sun; YingJay Yang; Yijen Chiu; John Edward Bowers

doi:10.1117/12.392187

11 July 2000 GaAs-based long-wavelength traveling-wave photodetector

JinWei Shi, Chi-Kuang Sun, YingJay Yang, Yijen Chiu, John Edward Bowers

Proceedings Volume 4078, Optoelectronic Materials and Devices II; (2000) https://doi.org/10.1117/12.392187
Event: Photonics Taiwan, 2000, Taipei, Taiwan

Abstract

GaAs-based high-speed photodetectors attract lots of attention in the past twenty years due to their maturity in material growth and processing. However their wide bandgap characteristic (830nm) restricts their applications in fiber communication wavelength (1.3(mu) m~1.55(mu) m). Recently some research groups had demonstrated GaAs-based n-i-n, p-i-in waveguide type photodetectors operating at 1.55 (mu) m by taking advantage of the mid-gap defect absorption of low- temperature grown GaAs (LTF-GaAs). In this paper we propose and analyze different bandwidth-limited factors for LTG-GAAs based metal-semiconductor-metal traveling wave photodetector (MSM TWPD) for both long and short wavelength cases. According to our calculation results, MSM TWPDs release the bandwidth limitation bottleneck in previous n-i-n and p-i-n TWPD structures, especially in the long wavelength case. Our analysis indicates that Lt-GaAs based traveling-wave photodetectors can offer excellent bandwidth as well as high saturation power performances in fiber communication wavelength, which corresponds to long absorption length regime.

Citation Download Citation

JinWei Shi, Chi-Kuang Sun, YingJay Yang, Yijen Chiu, and John Edward Bowers "GaAs-based long-wavelength traveling-wave photodetector", Proc. SPIE 4078, Optoelectronic Materials and Devices II, (11 July 2000); https://doi.org/10.1117/12.392187

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