Standalone Clock and Data Recovery System with Adjustable Threshold
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Solution Overview
Problem
Existing clock and data recovery (CDR) systems are limited by their requirement for plug-in modules, high costs, inability to operate standalone, restricted to specific manufacturers, and inadequate sensitivity for low-level optical inputs, lacking optical-to-electrical conversion and multiple clock outputs.
Innovation Solution
A standalone, cost-efficient system for OC-192 multi-rate high-sensitivity clock and data recovery with adjustable decision threshold, RF input clock recovery, and optical-to-electrical conversion, providing multiple clock outputs and capable of converting optical signals to electrical signals without requiring an optical input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plug-in module approach is used for CDR, then the device can be integrated into a DCA mainframe, but the device cannot operate standalone and requires unused channel space
Solution Approach 1:
The patent separates the CDR functionality from the DCA mainframe by creating a standalone module that can operate independently. The CDR device is segmented as a separate unit with its own processing capabilities, allowing it to function without being plugged into a mainframe while maintaining the option for integration when needed.
Solution Approach 2:
The CDR device is designed with universal functionality to operate in multiple modes: standalone operation, plug-in module mode, and with support for multiple data rates (OC-192, OC-48, OC-12). This multi-functionality allows the same device to adapt to different operational requirements without needing separate specialized units.
2Measurement precision
If a CDR device is designed for high sensitivity, then it can recover low-level optical inputs, but the manufacturing cost increases
Solution Approach 1:
The patent achieves high sensitivity (capable of recovering signals as low as -23 dBm) by optimizing key parameters in the optical-to-electrical conversion stage and decision circuit threshold settings. By carefully tuning these parameters during design and manufacturing, the system achieves high sensitivity without requiring expensive proprietary components or complex manufacturing processes.
Solution Approach 2:
The patent employs cost-effective, commercially available optical components and electronic circuits that can be easily manufactured and replaced. Rather than using expensive proprietary high-sensitivity components, the system uses standard off-the-shelf parts that achieve sufficient performance at lower cost, making the device economically viable for widespread deployment.
3Adaptability or versatility
If multiple clock outputs are provided, then the system versatility increases, but the device complexity increases
Solution Approach 1:
The patent provides multiple clock outputs (OC-192 and OC-48 rates) that are dynamically selectable through a control interface. The system can adaptively configure which clock outputs are active based on the input signal characteristics and user requirements. This dynamic configuration capability allows the device to provide multiple outputs when needed while maintaining a simpler operational state when fewer outputs are required, effectively managing complexity through adaptability.
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 system achieves high-sensitivity clock and data recovery at low optical input levels, offering multiple electrical clock outputs and cost-effectiveness, with enhanced sensitivity from 0 dBm to -23 dBm, and the ability to operate independently of specific DCA manufacturers.
Implementation Method 1
an optical-to-electrical conversion feature... The system further provides for the conversion of an optical signal to an electrical signal
Data Source
AI summary
The present invention provides a system and method for multi-rate, high-sensitivity CDR, including a variable/adjustable decision threshold, RF input clock recovery, and OE conversion feature. The system includes an optical input connector, CDR circuit, decision threshold circuit, internal power supply, OE converter, external electrical output, and multiple clock outputs. The system is assembled in a single, stand-alone unit. The system includes an OC-192 data output, and OC-192 (9.953-10.709 GHz) and ¼ OC-48 (2.488-2.677 GHz) clock outputs. The decision threshold level is adjustable and optimized by a system user. The system is also used in combination with a digital communications analyzer. A recovered clock of the CDR circuit provides trigger for the DCA. The system includes an electrical input connector. Optionally, the system triggers directly from an RF electrical input in substitution of an optical input. The system is also used to convert an optical signal to an electrical signal, bypassing the CDR circuit.