Temperature controlled multi-channel transmitter optical subassembly and optical transceiver module including same

摘要

A temperature controlled multi-channel transmitter optical subassembly (TOSA) may be used in a multi-channel optical transceiver. The temperature controlled multi-channel TOSA generally includes an array of lasers optically coupled to an optical multiplexer, such as an arrayed waveguide grating (AWG), to combine multiple optical signals at different channel wavelengths. The lasers may be thermally tuned to the channel wavelengths by establishing a global temperature for the array of lasers and separately raising local temperatures of individual lasers in response to monitored wavelengths associated with the lasers. A temperature control device, such as a TEC cooler coupled to the laser array, may provide the global temperature and individual heaters, such as resistors adjacent respective lasers, may provide the local temperatures. The optical transceiver may be used in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON).

主权项

1. A method for controlling temperature for individually tuning lasers in a laser array to a plurality of channel wavelengths in a multi-channel transmitter optical subassembly (TOSA), the method comprising: establishing a global temperature for the laser array such that at least one laser in the laser array is tuned to one of the channel wavelengths at the global temperature; raising local temperatures for other lasers in the laser array individually above the global temperature such that the other lasers are tuned to the other channel wavelengths, respectively; monitoring the wavelengths associated with each of the lasers; and adjusting the local temperatures of the other lasers in response to monitored wavelengths to maintain the other lasers tuned to the other channel wavelengths; wherein the one of the channel wavelengths tuned at the global temperature is the smallest of the channel wavelengths.