OLT Transceiver Chip Integration for Cost Reduction
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Solution Overview
Problem
The traditional OLT end optical modules based on GPON and EPON require two circuit chips for the limiting amplifier and laser driver, leading to increased production costs and longer production cycles.
Innovation Solution
The development of OLT transceiver integrated chips that combine the functions of the limiting amplifier and laser driver into a single chip, reducing the number of chips needed and incorporating advanced circuit components like NPN transistors, I2C circuits, analog-to-digital converters, and voltage-controlled current sources to enhance efficiency and reduce costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two separate circuit chips are used for limiting amplifier and laser driver in traditional OLT optical modules, then functional separation and reliability are improved, but production cost increases and production cycle lengthens
Solution Approach 1:
The patent merges the limiting amplifier and laser driver functions into a single integrated chip. The chip includes a limiting amplifier module with multiple amplification stages and a laser driver module with current control circuits, both fabricated on the same semiconductor substrate. This integration eliminates the need for separate chips while maintaining functional independence through internal circuit isolation, thereby reducing production steps and cycle time.
Solution Approach 2:
The integrated chip is designed to perform multiple functions simultaneously - it includes not only the limiting amplifier and laser driver but also additional modules such as temperature compensation circuits, bias control circuits, and optical power monitoring circuits. This multi-functional design allows a single chip to replace multiple separate components, reducing overall system complexity and production requirements.
2Ease of repair
If two separate circuit chips are used for limiting amplifier and laser driver, then modular design and ease of repair are improved, but manufacturing cost increases
Solution Approach 1:
The patent integrates multiple functional modules including limiting amplifier, laser driver, temperature compensation, and bias control circuits onto a single chip. This consolidation reduces the total number of discrete components, assembly steps, and interconnections required, thereby lowering manufacturing costs while maintaining ease of repair through the chip's internal modular architecture.
3Adaptability or versatility
If multiple chips are used in traditional OLT optical modules, then functional specialization is improved, but device complexity and production cost increase
Solution Approach 1:
The integrated chip incorporates multiple specialized modules within a single device - including limiting amplifier with adjustable gain stages, laser driver with precision current control, temperature compensation circuits, and bias control. Each module maintains its specialized function while being physically integrated, reducing the number of separate chips from two or more to just one, thereby simplifying the overall device architecture.
Data Source
AI summary
A receiving and sending integrated chip for an OLT, which relates to the field of integrated circuits and optical communications. The present invention arms at resolving the problem of high production costs and long production cycle due to the fact that the functions of a limiting amplifier and a laser driver of a traditional OLT end optical module based on a GPON and an EPON are implemented by means of two circuit chips. The present invention provides two solutions. The first solution is designed based on the EPON, a transmitter threshold value configuration mode is that the threshold value configuration is implemented after an upper computer and a slave I2C circuit in the chip cooperate to complete electrifying, and LOS signal determination in a receiver can be automatically reset by means of a chip internal module. The second solution is designed based on the GPON, the transmitter threshold value configuration mode is that the threshold value configuration is implemented after the upper computer and the slave I2C circuit in the chip cooperate to complete electrifying, LOS signal determined in the receiver can be automatically reset by means of the chip internal module and can also by manually reset by means of chip external RESET signals in cooperation with a corresponding peripheral circuit, and LOS and SD signal output selection pins are arranged.