Low polarization dependent loss of InP-based waveguide photodetector integrated with spot-size converter for 100Gb/s coherent receiver

Young-Ho Ko; Joong-Seon Choe; Won-Seok Han; Jong-Hoi Kim; Yong-Hwan Kwon

doi:10.1117/12.2209452

24 February 2016 Low polarization dependent loss of InP-based waveguide photodetector integrated with spot-size converter for 100Gb/s coherent receiver

Young-Ho Ko, Joong-Seon Choe, Won-Seok Han, Jong-Hoi Kim, Yong-Hwan Kwon

Author Affiliations +

Proceedings Volume 9744, Optical Components and Materials XIII; 974416 (2016) https://doi.org/10.1117/12.2209452
Event: SPIE OPTO, 2016, San Francisco, California, United States

Abstract

We demonstrated the waveguide photodetector (WG PD) integrated with spot-size converter (SSC) for coherent receiver of 100Gb/s operation. The WG PD integrated with SSC was designed as diluted WG, dual lateral taper structure, and PIN-photodiode. The epitaxial layers of In_xGa_1-xAs_yP_1-y/InP, In_xGa_1-xAs_yP_1-y, and InGaAs were adopted as the diluted WG, dual tapers, and absorber of PD, respectively. The shape and thickness of each structure were determined through the simulation of 3D finite-difference beam propagation method. Although the evanescent coupling was highly sensitive, we optimized the structures with simulated responsivity and polarization dependent loss (PDL) as 0.70 A/W and 0.1 dB, respectively. We successfully obtained the SSC-integrated WG PD through numerous fabrication process including photolithography. The electrical and optical properties were characterized with laser launching. Fabricated PDs had almost similar responsivity and PDL with the simulation results. The responsivity and PDL were measured as 0.7 A/W and less than 0.3 dB respectively. The 3 dB-bandwidth was measured as 34 GHz. We successfully realized low PDL and high responsivity by adopting the lateral taper structure for SSC-integrated WG PD.

Citation Download Citation

Young-Ho Ko, Joong-Seon Choe, Won-Seok Han, Jong-Hoi Kim, and Yong-Hwan Kwon "Low polarization dependent loss of InP-based waveguide photodetector integrated with spot-size converter for 100Gb/s coherent receiver", Proc. SPIE 9744, Optical Components and Materials XIII, 974416 (24 February 2016); https://doi.org/10.1117/12.2209452

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KEYWORDS

Polarization

Photonic integrated circuits

Receivers

Photodetectors

Waveguides

Beam propagation method

Single mode fibers

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