Optical Transceiver Crosstalk Prevention
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Solution Overview
Problem
Single-substrate integrated optical transceiver modules suffer from electrical crosstalk, which reduces the sensitivity of the receiver and generates errors, especially when noise levels are high, due to the partial delivery of AC power from the light source to the light receiver.
Innovation Solution
Incorporating a crosstalk prevention unit with a capacitor and resistor connected between the substrate and ground to direct AC power to the ground, thereby preventing electrical crosstalk, and using a transistor to control the current and apply a reverse bias voltage to the light receiver without the need for a negative voltage source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-substrate integrated optical transceiver module is used to reduce package cost, then manufacturing cost is reduced, but electrical crosstalk occurs between light source and receiver
Solution Approach 1:
The patent introduces a crosstalk prevention unit as an intermediary component between the light source and light receiver on the substrate. This unit includes a capacitor connected between the substrate and ground, which acts as an electrical mediator to block AC power from reaching the receiver while maintaining the benefits of single-substrate integration.
Solution Approach 2:
The patent extracts the harmful AC power component from the electrical signal path by using a capacitor to ground. This removes the crosstalk-generating element while preserving the integrated structure, effectively separating the harmful electrical interference from the optical signal transmission path.
2Power
If AC power is delivered to the light receiver in a single-substrate integrated module, then the light source can be driven, but electrical crosstalk reduces receiver sensitivity
Solution Approach 1:
The capacitor serves as an electrical intermediary that allows DC power to pass through to the light receiver while blocking AC power. This mediator preserves the necessary power delivery function while eliminating the harmful AC crosstalk that degrades receiver sensitivity.
Solution Approach 2:
The patent applies different electrical characteristics to different parts of the receiver circuit. By connecting the capacitor specifically to the receiver's power terminal, it creates a localized filtering effect that allows DC components to pass while blocking AC components, thereby preserving receiver sensitivity in the affected local region.
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 solution effectively reduces electrical crosstalk between the light source and receiver, improving the sensitivity of the optical transceiver module and simplifying the manufacturing process by eliminating the need for a negative voltage application.
Implementation Method 1
a capacitor and a resistor respectively connected between a substrate and ground to prevent electrical crosstalk
Implementation Method 2
a transistor to control a current and apply a reverse bias voltage to the light receiver
Data Source
AI summary
Provided is an optical transceiver module of an optical transceiver, which is used for optical communications. The optical transceiver module prevents electrical crosstalk between a light source and a light receiver. Additionally, the optical transceiver module includes an optical transceiver unit including a light source and a light receiver together integrated into a substrate, a circuit unit including a drive circuit driving the light source and a detect circuit reading a signal of the light receiver, and a crosstalk prevention unit connected between the substrate and ground to prevent electrical crosstalk between the light source and the light receiver.