Multi-Channel Receiver Optical Sub Assembly Vertical Integration
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Solution Overview
Problem
The development of multi-channel receiver optical sub assemblies with high sensitivity photodiodes integrated in optical transceiver systems is challenging due to the difficulty in optimizing the arrangement and size of photodiodes, transimpedance amplifiers, and capacitors, which affects the sensitivity and cost of the sub assemblies.
Innovation Solution
A multi-channel receiver optical sub assembly is designed with a monolithically integrated photodiode array and transimpedance amplifiers connected via wire bonding, featuring anode electrode pads arranged at 180 degrees and a submount with transmission lines for power and ground, allowing for efficient integration and reduced size, power consumption, and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If photodiodes, transimpedance amplifiers, and capacitors are integrated in a multi-channel ROSA, then data transmission capability is improved, but manufacturing difficulty and sensitivity optimization become worse
Solution Approach 1:
The patent divides the multi-channel ROSA into independent channel units, each with its own photodiode, transimpedance amplifier, and capacitor. This segmentation allows each channel to be optimized and manufactured independently, reducing overall manufacturing complexity while maintaining high data transmission capability through parallel operation of multiple channels
Solution Approach 2:
The patent transitions from planar arrangement to three-dimensional vertical stacking of components. By arranging photodiodes, capacitors, and transimpedance amplifiers in vertical layers with optimized spatial positioning, the patent reduces wire bonding length and improves sensitivity while maintaining integration density for high-capacity data transmission
2Reliability
If photodiode size is increased to improve wire bonding optimization, then sensitivity is improved, but chip size and capacitance increase
Solution Approach 1:
The patent moves from two-dimensional planar layout to three-dimensional vertical arrangement. Photodiodes are positioned at optimized vertical heights above the capacitor plane, allowing sufficient wire bonding length for sensitivity optimization without increasing the horizontal chip footprint. This vertical dimensionality change decouples sensitivity requirements from chip area constraints
Solution Approach 2:
The patent optimizes the local spatial arrangement of wire bonds connecting photodiodes to transimpedance amplifiers. By carefully controlling wire bonding paths and lengths in the vertical dimension, each photodiode achieves optimal electrical connection quality for high sensitivity without requiring increased chip area
3Reliability
If transimpedance amplifier and capacitor sizes are optimized, then wire bonding performance is improved, but device complexity increases
Solution Approach 1:
The patent assigns dedicated capacitors to specific photodiode-transimpedance amplifier pairs in each channel. This segmentation allows independent optimization of capacitor values and positions for each channel's wire bonding requirements, improving overall wire bonding performance while managing complexity through modular channel design
Solution Approach 2:
The patent positions capacitors and transimpedance amplifiers at different vertical levels to optimize wire bonding paths. By utilizing the vertical dimension for component placement, the patent achieves optimal wire bonding lengths and angles without increasing horizontal complexity or requiring complex routing schemes
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 configuration enables the manufacture of high-performance, multi-function, low-power, and compact multi-channel receiver optical sub assemblies with improved sensitivity and reduced chip size, facilitating mass data transmission in metro access networks.
Implementation Method 1
a plurality of photodiodes (PDs) disposed on a first capacitor, and including receiving areas disposed at centers thereof
Implementation Method 2
a plurality of transimpedance amplifiers (TIAs) arranged on a plurality of second capacitors, respectively, and connected with the anode pads of the respective PDs through wire bonding
Data Source
AI summary
Disclosed is a multi-channel receiver optical sub assembly. The a multi-channel receiver optical sub assembly includes: a multi-channel PD array, in which a plurality of photodiodes (PDs) disposed on a first capacitor, and including receiving areas disposed at centers thereof and anode electrode pads arranged in an opposite direction at an angle of 180 degrees based on the receiving areas between the adjacent PDs is monolithically integrated; a plurality of transimpedance amplifiers (TIAs) arranged on a plurality of second capacitors, respectively, and connected with the anode pads of the respective PDs through wire bonding; a submount on which the first capacitor.