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An Effective Integration Solution for 100 Gb/s DP-QPSK Coherent Receiver With a Small Skew

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6 Author(s)
Lingjie Wang ; Wuhan Nat. Lab. for Optoelectron., Huazhong Univ. of Sci. & Technol., Wuhan, China ; Yanli Zhao ; Chuan Shi ; Zheng Chen
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We propose and develop a simple hybrid integration solution for a 100 Gb/s dual polarization quadrature phase shift keying coherent receiver. The cost-effective, precise, and passive alignment technique can be used to couple four output waveguides of planar lightwave circuits (PLCs) based 90 ° optical hybrid (OH) with a 1 × 4 photodiode (PD) array directly, adopting an infrared charge-coupled device camera to monitor the light spots, a beam of infrared light to illuminate the light spots and the active areas of PD array, and an epoxy glue to adhere the PLC-based 90 ° OH to the heat sink. Based on this proposed coupling scheme, the responsivity variation for the coherent receiver is less than ±0.18 dB for all PD channels in an environment temperature range of -5°C-80 °C and the skew of this coherent receiver is only 1.96 ps.

Published in:

Photonics Technology Letters, IEEE  (Volume:26 ,  Issue: 3 )