Optical Transceiver Module Idle Detection for Hot-Plug Reliability
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Solution Overview
Problem
Current active optical cables (AOCs) for USB applications often lead to invalid modes when a host is coupled but a device is not, requiring complex user settings or reboots, and fail to detect device detachment, causing inappropriate state machine operations.
Innovation Solution
An optical transceiver module with electronic and optical signal terminals that enters an idle detection state if no electronic signal is received within a predetermined time, performing receiver termination detection to determine device coupling and continuously transmitting optical signals, enabling proper link establishment and hot-plugging functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical transceiver module continuously transmits optical signals during idle detection state, then device detachment can be detected, but energy consumption increases
Solution Approach 1:
The optical transceiver module performs periodic receiver termination detection during idle detection state instead of continuous transmission. The module enters idle detection state after a predetermined time without receiving electronic signals, then periodically detects device coupling status through receiver termination detection, and only continuously transmits optical signals when detachment is confirmed. This periodic approach reduces energy consumption compared to continuous transmission while maintaining reliable detachment detection capability.
2Ease of operation
If the host performs link training sequence when device is not coupled, then link establishment is attempted, but invalid mode is entered requiring complex settings or reboots
Solution Approach 1:
The optical transceiver module performs preliminary receiver termination detection before the host initiates link training sequence. By detecting device coupling status in advance through receiver termination detection during idle detection state, the module prevents the host from attempting link training when no device is coupled. This preliminary detection avoids entering invalid mode and eliminates the need for complex user settings or reboots, maintaining automatic link establishment capability.
3Measurement precision
If the optical transceiver module enters idle detection state after predetermined time without signals, then device coupling status can be verified, but transmission delay occurs
Solution Approach 1:
The optical transceiver module dynamically adjusts its detection and transmission behavior based on operational state. During normal operation, the module maintains active link without unnecessary detections. Only when no electronic signals are received for a predetermined time does the module transition to idle detection state and perform receiver termination detection. This dynamic state transition ensures high detection accuracy when needed while minimizing transmission delays during normal operation.
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
Prevents invalid modes and detects device detachment, ensuring correct state machine operations and user convenience by continuously transmitting optical signals during idle detection, thus supporting reliable hot-plugging and link maintenance.
Implementation Method 1
optical-fiber transmission has advantage of transmission speed, transmission distance, and capability of resisting interference
Implementation Method 2
active optical cables (AOCs) are disposed on two electrical-to-optical/optical-to-electronic (EO/OE) transformation processing chips
Implementation Method 3
active optical cables (AOCs) are disposed on two electrical-to-optical/optical-to-electronic (EO/OE) transformation processing chips
Data Source
AI summary
An optical transceiver module coupled to a device is provided. The optical transceiver module includes an electronic signal transmitting terminal coupled to a receiving terminal of the device, an electronic signal receiving terminal coupled to a transmitting terminal of the device, an optical signal receiving terminal coupled to the electronic signal transmitting terminal, and an optical signal transmitting terminal coupled to the electronic signal receiving terminal. When the optical transceiver module is at an normal operation state and the electronic signal receiving terminal does not receive any electronic signal over a first predetermined time period, the optical transceiver module enters a idle detection state to make the electronic signal transmitting terminal to perform a receiver termination detection to the device to determine whether the device is coupled to the optical transceiver module. At the idle detection state, the optical signal transmitting terminal transmits the optical signal continuously.