A PLC‐Based Optical Sub‐assembly of Triplexer Using TFF‐Attached WDM and PD Carriers

ABSTRACT We have fabricated a planar lightwave circuit (PLC) hybrid‐integrated optical sub‐assembly of a triplexer using a thin film filter (TFF)‐attached wavelength division multiplexer (WDM) and photodiode (PD) carriers. Two types of TFFs were attached to a diced side of a silica‐terraced PLC platform, and the PD carriers with a 45° mirror on which pin‐PDs were bonded were assembled with the platform. A clear transmitter eye‐pattern and minimum receiver sensitivity of ‐24.5 dBm were obtained under 1.25 Gb/s operation for digital applications, and a second‐order inter‐modulation distortion (IMD2) of‐70 dBc was achieved for an analog receiver.