MONITORING AND CONTROLLING TEMPERATURE ACROSS A LASER ARRAY IN A TRANSMITTER OPTICAL SUBASSEMBLY (TOSA) PACKAGE
First Claim
1. A method for monitoring and controlling temperature of a laser array in a multi-channel transmitter optical subassembly (TOSA) package, the method comprising:
- sensing at least first and second temperatures at first and second locations within the TOSA package proximate at least first and second ends of the laser array;
determining a temperature tilt across the laser array and within the TOSA package, wherein the temperature tilt represents a change in temperature as a function of distance;
determining, from the temperature tilt, an estimated local temperature at at least a third location along the laser array; and
adjusting a temperature proximate the third location along the laser array in response to the estimated temperature.
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Accused Products
Abstract
The temperature at different locations along a multiplexed laser array may be monitored by sensing temperature at two locations within a transmitter optical subassembly (TOSA) package housing the laser array. The temperature at the two locations is used to determine a temperature tilt across the laser array. Estimated temperatures may then be determined at one or more other locations along the laser array from the temperature tilt. The estimated temperature(s) may then be used to adjust the temperature proximate the other locations, for example, for purposes of tuning lasers at those locations along the laser array to emit a desired channel wavelength. The TOSA package may be used in an optical transceiver in a wavelength division multiplexed (WDM) optical system, for example, in an optical line terminal (OLT) in a WDM passive optical network (PON).
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Citations
20 Claims
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1. A method for monitoring and controlling temperature of a laser array in a multi-channel transmitter optical subassembly (TOSA) package, the method comprising:
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sensing at least first and second temperatures at first and second locations within the TOSA package proximate at least first and second ends of the laser array; determining a temperature tilt across the laser array and within the TOSA package, wherein the temperature tilt represents a change in temperature as a function of distance; determining, from the temperature tilt, an estimated local temperature at at least a third location along the laser array; and adjusting a temperature proximate the third location along the laser array in response to the estimated temperature. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A temperature controlled multi-channel transmitter optical subassembly (TOSA) package comprising:
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a TOSA housing; a laser array located in the TOSA housing and configured to generate laser light associated with a plurality of optical channels; an optical multiplexer located in the TOSA housing and optically coupled to the laser array, the optical multiplexer being configured to combine the laser light at different respective channel wavelengths; at least first and second temperature sensors located in the TOSA housing at first and second locations proximate at least first and second ends of the laser array, the first and second temperature sensors being configured to sense at least first and second temperatures at the first and second locations; and temperature control devices located in the TOSA housing and thermally coupled to the laser array for adjusting temperatures at different locations along the laser array, wherein the temperature control devices are configured to adjust the temperature proximate at least a third location along the laser array in response to an estimated temperature at the third location, the estimated temperature being estimated from a temperature tilt determined from the first and second temperatures at the first and second locations. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. A multi-channel transceiver module comprising:
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a transceiver housing; at least one temperature controlled multi-channel transmitter optical subassembly (TOSA) package located in the transceiver housing, the TOSA package being configured to transmit a wavelength division multiplexed (WDM) optical signal on multiple channel wavelengths, the TOSA package comprising; a TOSA housing; a laser array located in the TOSA housing and configured to generate laser light associated with a plurality of optical channels; an optical multiplexer located in the TOSA housing and optically coupled to the laser array, the optical multiplexer being configured to combine the laser light at different respective channel wavelengths; at least first and second temperature sensors located in the TOSA housing at first and second locations proximate at least first and second ends of the laser array, the first and second temperature sensors being configured to sense at least first and second temperatures at the first and second locations; and temperature control devices located in the TOSA housing and thermally coupled to the laser array for adjusting temperatures at different locations along the laser array; a temperature control system configured to determine a temperature tilt from the first and second temperatures sensed at the first and second locations and to determine at least one estimated temperature at at least a third location along the laser array, wherein the temperature control devices are configured to adjust the temperature proximate the third location along the laser array in response to the at least one estimated temperature; and at least one multi-channel receiver optical subassembly (ROSA) located in the transceiver housing, the ROSA being configured to receive a wavelength division multiplexed (WDM) optical signal on multiple channel wavelengths. - View Dependent Claims (19, 20)
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Specification