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학술지 High-speed Waveguide Photodetector for 64 Gbaud Coherent Receiver
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저자
고영호, 최중선, 한원석, 이서영, 한영탁, 정현도, 윤천주, 김종회, 백용순
발행일
201802
출처
Optics Letters, v.43 no.3, pp.579-582
ISSN
0146-9592
출판사
Optical Society of America(OSA)
DOI
https://dx.doi.org/10.1364/OL.43.000579
협약과제
17HB2300, 소프트웨어 정의 네트워크(SDN) 기반 Flexible 광노드 핵심기술 개발, 백용순
초록
A high-speed waveguide photodetector has been successfully fabricated for an integrated coherent receiver. Dual laterally tapered structures are introduced for a spot-size converter. We optimize the responsivity and the polarization-dependent loss of the spot-size converter-integrated waveguide photodetector through the beam propagation method simulation. The waveguide photodetector is designed with electrical as well as optical optimizations. The photodetector provides sufficient alignment tolerance, high responsivity of 0.73 A/W, and low polarization-dependent loss of 0.27 dB, which is in good agreement with the simulation results. By increasing the thickness of the matching layer and the n-doped upper taper, the electrical properties of the photodetector are enhanced. The photodetector has a 3 dB bandwidth of 45 GHz, providing high-speed operation. Through the electrical and optical optimizations, we successfully obtain the high-speed waveguide photodetector for a 64 Gbaud integrated coherent receiver.
KSP 제안 키워드
3-dB bandwidth, 45 GHz, Coherent receiver, Integrated waveguide, Low polarization, N-doped, Polarization dependent loss, Spot size converter(SSC), Waveguide photodetector, alignment tolerance, beam propagation method