Multi-Channel TOSA TEC Thermal Management
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Solution Overview
Problem
Existing multi-channel optical transceivers in WDM-PONs face challenges in providing precise temperature control for laser arrays and AWGs in a small form factor with low power consumption, which is crucial for maintaining accurate wavelength division multiplexing in optical communications networks.
Innovation Solution
A temperature-controlled multi-channel transmitter optical subassembly (TOSA) that includes an array of lasers optically coupled to an arrayed waveguide grating (AWG), with a thermoelectric cooler (TEC) used to control the temperature of both the lasers and the AWG, allowing for precise wavelength control and efficient power management within a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a multi-channel TOSA includes an array of lasers optically coupled to an arrayed waveguide grating (AWG) with temperature control, then wavelength precision and accuracy are improved, but device complexity and power consumption increase
Solution Approach 1:
The patent combines the temperature control of the laser array and AWG into a single integrated temperature control system. The laser array and AWG are mounted on a common substrate that serves as a shared thermal management platform, allowing simultaneous temperature regulation of both components through one control mechanism, thereby reducing overall system complexity while maintaining wavelength precision
Solution Approach 2:
The common substrate serves multiple functions: it provides mechanical support for both the laser array and AWG, acts as a thermal conduction path for temperature control, and serves as a mounting platform for the temperature control device. This multi-functionality reduces the number of separate components needed, lowering device complexity while maintaining precise wavelength control
2Measurement precision
If temperature control is provided for laser array and AWG in a small form factor, then wavelength accuracy is improved, but power consumption increases
Solution Approach 1:
The patent merges the temperature control of the laser array and AWG into a single integrated system using a common substrate. This consolidation allows the temperature control device to manage both components simultaneously, reducing redundant power consumption that would occur with separate control systems while maintaining wavelength accuracy
Solution Approach 2:
The patent applies temperature control locally at the common substrate level where both the laser array and AWG are mounted. This localized approach targets the specific thermal requirements of the optical components without unnecessarily cooling or heating other parts of the system, optimizing power consumption while achieving the required wavelength accuracy
3Measurement precision
If temperature control is provided for laser array and AWG in a small form factor, then wavelength accuracy is improved, but the device size increases
Solution Approach 1:
The patent combines the laser array, AWG, and temperature control device into a single integrated assembly mounted on a common substrate. This consolidation eliminates the need for separate mounting structures and thermal management components that would increase device volume, achieving wavelength accuracy within a compact form factor
Solution Approach 2:
The patent implements a nested arrangement where the laser array and AWG are mounted on the common substrate, and the temperature control device is integrated within or adjacent to this assembly. This nested configuration maximizes space utilization and minimizes the overall device volume while maintaining the required wavelength accuracy through effective temperature control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enables precise wavelength precision and accuracy (±0.05 nm) within a small form factor while maintaining low power dissipation, effectively enhancing the efficiency of WDM-PONs by optimizing temperature control for multi-channel optical transceivers.
Implementation Method 1
a thermoelectric cooler (TEC) used to control the temperature of both the lasers and the AWG
Implementation Method 2
an arrayed waveguide grating (AWG) optically coupled to the array of lasers and configured to combine the laser light at different respective channel wavelengths
Data Source
AI summary
A temperature controlled multi-channel transmitter optical subassembly (TOSA) may be used in a multi-channel optical transceiver. The multi-channel TOSA generally includes an array of lasers optically coupled to an arrayed waveguide grating (AWG) to combine multiple optical signals at different channel wavelengths. A temperature control system may be used to control the temperature of both the array of lasers and the AWG with the same temperature control device, e.g., a thermoelectric cooler (TEC). The multi-channel optical transceiver may also include a multi-channel receiver optical subassembly (ROSA). 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).