Īn ICR is composed of various optical components such as balanced photodiodes (BPDs), optical hybrids (OHs), and polarization beam splitters (PBSs) to deal with a dual polarization quadrature phase-shift (DP-QPSK), and furthermore, dual-polarization 16 quadrature amplitude modulation for a bit rate beyond 100 G. Therefore, many research groups have focused on integration technology to solve these issues –. Devices used in metro networks are more sensitive to power consumption, cost, and size than those in long-haul networks because of their large numbers of nodes. A bit error rate of is achieved at a 112-Gbps back-to-back transmission with off-line digital signal processing.Īn integrated intradyne coherent receiver (ICR) has been the key device in operating coherent optical systems with a speed of more than 100 G in a long-haul communication, and furthermore, is certain to spread into metro networks owing to the technology improvement of optical and electrical devices. 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 stepped CuW block is used to dissipate the heat generated from trans-impedance amplifiers and to vertically align RF transmission lines.

Instead of a ceramic sub-mount, a low-cost printed circuit board is applied in the module.

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. Two polarization beam splitters and two 90° optical hybrids are monolithically integrated in one silica PLC chip with an index contrast of 2%-Δ. We present a cost-effective dual polarization quadrature phase-shift coherent receiver module using a silica planar lightwave circuit (PLC) hybrid assembly.

Dp chip cost