Light-Receiving Device Array Ground Electrode Crosstalk Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing light-receiving device arrays experience electrical crosstalk between adjacent photodiodes and electric lines, leading to noise and operation errors in optical modules and transceivers, despite previous methods attempting to reduce crosstalk between photodiodes and channels.
Innovation Solution
A light-receiving device array design featuring a photodiode array with first and second conductivity type electrodes connected to electric lines on a carrier, where a ground electrode is formed between pairs of electric lines on the front surface and rear surface, and through-holes with third ground electrodes, enhancing electrical isolation and reducing crosstalk between electric lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If electric lines are disposed adjacent to each other on the carrier to connect photodiodes, then the device complexity is reduced and manufacturing is simplified, but electrical crosstalk occurs between adjacent electric lines causing noise
Solution Approach 1:
A ground electrode is introduced as an intermediary element disposed between adjacent electric lines on the carrier. This ground electrode acts as a shield that intercepts and redirects electromagnetic fields, preventing direct coupling between signal lines. The ground electrode is connected to the substrate ground, creating a reference potential that further isolates adjacent signal lines from each other, thereby reducing electrical crosstalk while maintaining the compact layout.
Solution Approach 2:
The ground electrode is strategically positioned only in specific locations where crosstalk is most problematic - between adjacent electric lines on the carrier front surface. This localized approach provides targeted crosstalk reduction without requiring comprehensive shielding across the entire device, thus maintaining simplicity while addressing the harmful effect where it matters most.
2Productivity
If photodiodes are arranged in an array to increase channel capacity, then the productivity and data transmission capability are improved, but crosstalk between adjacent channels increases causing operation errors
Solution Approach 1:
Ground electrodes are disposed between adjacent photodiode channels on the carrier, serving as intermediary shielding elements. These ground electrodes prevent electromagnetic coupling between adjacent light-receiving sections, ensuring that signals from different channels remain isolated. This allows the photodiode array to maintain high channel capacity while preventing operation errors caused by inter-channel crosstalk.
3Ease of manufacture
If the carrier structure is simplified to reduce manufacturing cost, then the ease of manufacture is improved, but electrical isolation between electric lines is insufficient leading to crosstalk
Solution Approach 1:
The ground electrode on the carrier acts as a simple yet effective intermediary structure that provides electrical isolation between adjacent electric lines. This single-layer ground electrode approach maintains manufacturing simplicity while effectively reducing crosstalk, avoiding the need for complex multi-layer shielding structures or increased spacing between lines.
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
The design effectively suppresses electrical crosstalk between electric lines, improving the reliability and accuracy of optical modules and transceivers by maintaining stable voltage and reducing noise, with demonstrated high sensitivity and frequency response characteristics.
Implementation Method 1
a photodiode array 3 provided with plural light-receiving sections 19 on a semiconductor substrate 11, each light-receiving section 19 converting an input optical signal into an electric signal
Data Source
AI summary
A light-receiving device array includes a photodiode array that is provided with plural light-receiving sections each of which includes a first conductivity type electrode and a second conductivity type electrode, and a carrier, wherein the carrier includes plural pair of electric lines each of which is formed from a first electric line connected to the first conductivity type electrode of each light-receiving section, and a second electric line connected to the second conductivity type electrode of the light-receiving section, a first ground electrode that extends between one pair of electric lines of the plural pair of electric lines and a pair of electric lines adjacent to the one pair of electric lines, and a second ground electrode that is formed on a part of the rear surface and is electrically connected to the first ground electrode.