The design of polymer planar optical triplexer with MMI filter and directional coupler

Optical bidirectional WDM transceiver is a key component of the Passive Optical Network of the Fiber to the Home topology. Essential parts of such transceivers are filters that combine multiplexing and demultiplexing function of optical signal (triplexing filters). In this paper we report about a design of a new planar optical multi- wavelength selective system triplexing filter, which com- bines a multimode interference filter with directional cou- pler based on the epoxy polymer SU-8 on Si/SiO2 sub- strate. The optical triplexing filter was designed using the Beam Propagation Method. The aim of this project was to optimize the triplexing filter optical parameters and to minimize the planar optical wavelength selective system dimensions. The multimode interference filter was used for separation of downstream optical signal in designed opto- electronic integrated WDM transceiver. The directional coupler was used for adding of upstream optical signal.