Optical Loopback Circuit for Transceiver Calibration
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Solution Overview
Problem
Conventional optical transceivers require manual calibration using fiber jumpers, which is impractical and susceptible to distortion in long communication channels, especially with multi-level modulation schemes, and cannot switch between calibration and normal modes without reconfiguring fiber connections.
Innovation Solution
Incorporating an optical loopback circuit within the transceiver housing to couple the transmitter and receiver, allowing for calibration without fiber jumpers and enabling seamless switching between calibration and normal modes with the same fiber connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration using fiber jumpers is used, then calibration can be performed, but the process becomes impractical and susceptible to distortion in long communication channels
Solution Approach 1:
The patent extracts the calibration function from external fiber jumpers and integrates it into the transceiver housing through an optical loopback circuit. This eliminates the need for manual external connections while maintaining calibration capability, directly resolving the contradiction between calibration precision and ease of operation.
Solution Approach 2:
The optical loopback circuit acts as an intermediary component within the transceiver that enables calibration signals to be routed from the transmitter to the receiver without requiring external fiber jumpers. This mediator eliminates the practical difficulties of manual calibration while preserving measurement precision.
2Adaptability or versatility
If fiber jumper connections are used for calibration, then calibration mode can be achieved, but switching between calibration and normal modes requires reconfiguring fiber connections
Solution Approach 1:
The patent merges the calibration path and normal operation path into a single integrated optical loopback circuit within the transceiver housing. This allows the system to switch between calibration and normal modes through internal configuration changes without requiring external fiber reconfiguration, eliminating time loss and improving adaptability.
Solution Approach 2:
The optical loopback circuit is designed to be dynamically reconfigurable, allowing the transceiver to switch between calibration mode and normal operation mode through internal control mechanisms. This dynamic capability enables rapid mode switching without manual intervention or external fiber reconfiguration.
3Ease of operation
If optical loopback circuit is integrated within housing, then calibration can be performed without fiber jumpers, but device complexity increases
Solution Approach 1:
The optical loopback circuit is designed to serve multiple functions: it enables calibration operations, supports normal signal transmission, and provides a unified path for both calibration and operational modes. This multi-functionality justifies the added complexity by eliminating the need for separate external calibration infrastructure.
Data Source
AI summary
Optical transceivers comprising optical loopback circuits are described. The optical transceiver may comprise a housing, which may host a transmitter, a receiver and the optical loopback circuit. The optical loopback circuit may be configured to route at least a portion of a modulated optical signal from the transmitter to the receiver. The optical loopback circuit may comprise tap couplers and/or optical switches. The optical transceiver may be switched between a normal mode and a calibration mode. The optical transceiver may maintain the same fiber connections even when the optical transceiver is switched from one mode to another. The transmitter, the receiver and the optical loopback circuit may be disposed on a common substrate, or on separate substrates.