Open AccessCost Effective Silica‐Based 100 G DP‐QPSK Coherent Receiver
Author(s) -
Lee SeoYoung,
Han YoungTak,
Kim JongHoi,
Joung HyunDo,
Choe JoongSeon,
Youn ChunJu,
Ko YoungHo,
Kwon YongHwan
Publication year - 2016
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.16.0015.0014
Subject(s) - materials science , amplifier , chip , printed circuit board , optics , dual polarization interferometry , electrical engineering , electronic engineering , optoelectronics , engineering , cmos , physics , antenna (radio)
We present a cost‐effective dual polarization quadrature phase‐shift coherent receiver module using a silica planar lightwave circuit (PLC) hybrid assembly. Two polarization beam splitters and two 90° optical hybrids are monolithically integrated in one silica PLC chip with an index contrast of 2%‐Δ. Two four‐channel spot‐size converter integrated waveguide‐photodetector (PD) arrays are bonded on PD carriers for transverse‐electric/transverse‐magnetic polarization, and butt‐coupled to a polished facet of the PLC using a simple chip‐to‐chip bonding method. Instead of a ceramic sub‐mount, a low‐cost printed circuit board is applied in the module. A stepped CuW block is used to dissipate the heat generated from trans‐impedance amplifiers and to vertically align RF transmission lines. The fabricated coherent receiver shows a 3‐dB bandwidth of 26 GHz and a common mode rejection ratio of 16 dB at 22 GHz for a local oscillator optical input. A bit error rate of 8.3 ×10 − 11is achieved at a 112‐Gbps back‐to‐back transmission with off‐line digital signal processing.