Aligning and directly optically coupling photodetectors to optical demultiplexer outputs in a multichannel receiver optical subassembly

摘要

A multi-channel receiver optical subassembly (ROSA) such as an arrayed waveguide grating (AWG), with outputs directly optically coupled to respective photodetectors such as photodiodes. In one embodiment, an AWG may be configured such that optical components of the AWG do not interfere with direct optical coupling, and the wire bonding points on the photodiodes may also be configured such that wire bonding does not interfere with direct optical coupling. The photodetectors may also be mounted on a photodetector mounting bar with a pitch sufficiently spaced to allow connection to floating grounds. A passive alignment technique may be used to determine the mounting locations on the photodetector mounting bar such that the photodetectors are aligned with the optical outputs.

主权项

1. A multi-channel receiver optical subassembly (ROSA) comprising:
a ROSA housing; an optical demultiplexer located in the ROSA housing, the optical demultiplexer including multiple optical outputs corresponding to multiple channels, the optical demultiplexer being configured to receive a wavelength division multiplexed (WDM) optical signal on multiple channel wavelengths and to demultiplex the WDM optical signal to produce demultiplexed optical signals on the multiple channel wavelengths, respectively; and an array of photodetectors located in the ROSA housing and spaced from the optical demultiplexer, the array of photodetectors aligned with and directly optically coupled to the multiple optical outputs, respectively, of the optical demultiplexer.