Single Controller IC Chip for Multi-Channel Optical Transceiver Modules
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Solution Overview
Problem
The complex scheme for controlling externally-modulated lasers (EAM-DFB) in multi-channel optical transceiver modules requires multiple controller IC chips, leading to high costs, large area consumption, and low manufacturing yield, making it difficult to thermally manage and manufacture efficiently.
Innovation Solution
A single controller IC chip is used to control EAM bias voltages, monitor EAM photocurrents, and manage DFB bias currents, implemented with multiple supply voltage domains and a level shift circuit to convert signals between domains, allowing for efficient control and monitoring in a compact and cost-effective manner.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple controller IC chips are used to control EAM-DFB lasers in multi-channel optical transceiver modules, then the control function is achieved, but the cost increases, area consumption increases, and manufacturing yield decreases
Solution Approach 1:
The patent merges multiple controller IC chips into a single controller IC chip that can control multiple EAM-DFB lasers. This consolidation integrates the control functions that were previously distributed across multiple chips, thereby reducing device complexity while improving ease of manufacture and manufacturing yield.
Solution Approach 2:
The single controller IC chip is designed with multi-functionality to control multiple EAM-DFB lasers simultaneously. It incorporates multiple supply voltage domains and level shift circuits to handle different voltage requirements of different laser channels, making one chip perform the work of multiple chips while reducing overall system complexity.
2Device complexity
If multiple controller IC chips are used to control EAM-DFB lasers, then the control function is achieved, but the area consumption on PCB increases
Solution Approach 1:
By merging multiple controller IC chips into a single chip, the physical footprint on the PCB is significantly reduced. The single chip occupies less space than multiple separate chips would require, thereby reducing area consumption while maintaining the necessary control functionality.
Solution Approach 2:
The universal controller IC chip designed to control multiple EAM-DFB lasers integrates multiple control functions within a single device, eliminating the need for multiple separate chips and reducing the overall area required on the PCB.
3Device complexity
If multiple controller IC chips are used to control EAM-DFB lasers, then the control function is achieved, but the cost increases
Solution Approach 1:
The consolidation of multiple controller IC chips into a single chip reduces the total component count and assembly complexity, leading to lower manufacturing costs. Fewer chips mean fewer placement operations, less testing, and reduced inventory management requirements.
Solution Approach 2:
The multi-functional controller IC chip that can control multiple EAM-DFB lasers replaces multiple specialized chips, reducing overall system cost through economies of scale and reduced component variety.
4Area of stationary object
If a single controller IC chip is used to control multiple EAM-DFB lasers with multiple supply voltage domains, then area consumption is reduced, but signal level conversion between domains is required
Solution Approach 1:
The patent introduces level shift circuits as intermediary components within the single controller IC chip to convert signals between different supply voltage domains. These level shift circuits act as mediators that enable communication between components operating at different voltage levels, solving the signal compatibility issue while maintaining the benefits of a compact single-chip design.
Data Source
AI summary
A control device that may be implemented in a single IC chip is provided that is capable of controlling EAM bias voltages and DFB bias currents and of monitoring the EAM photocurrents and received signal strength indicators (RSSIs) in a multi-channel optical transceiver module. The control device IC chip can be manufactured at relatively low cost with relatively high yield, and can be implemented in a relatively small area. To implement the control device in a single IC chip, multiple supply voltage domains are used in the IC chip, one of which is a negative supply voltage domain and one of which is a positive supply voltage domain. In order to provide these different supply voltage domains, a level shift circuit is employed in the IC chip that converts signals from the positive to the negative supply voltage domain, and vice versa, and changes the voltage levels, as needed.