Clock Synchronization Apparatus for Optical Digital Signal Processors
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Solution Overview
Problem
Optical digital signal processors (ODSPs) are limited in processing signals with varying transmission rates due to fixed sampling frequencies, making them inflexible for different optical transmission scenarios like 5G and high-definition video services, which require different bandwidths and transmission distances.
Innovation Solution
A clock synchronization apparatus and method that includes a digital interpolator, digital delay element, and clock control circuit to adjust and synchronize sampling clocks without relying on peripheral clock frequencies, enabling flexible application across various bandwidth scenarios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a fixed sampling frequency is used in ODSP, then the processing of services with fixed transmission rate is supported, but the adaptability to different transmission scenarios is reduced
Solution Approach 1:
The patent implements dynamic sampling frequency adjustment by introducing a clock synchronization apparatus that can adaptively change the sampling frequency based on the transmission rate of the service being processed. The digital interpolator dynamically adjusts the sampling clock frequency, allowing the ODSP to transition from fixed to dynamic operation, thereby resolving the contradiction between processing reliability and adaptability to different transmission scenarios
Solution Approach 2:
The patent changes the parameter of sampling frequency from fixed to variable by implementing a clock synchronization apparatus that adjusts the sampling clock frequency according to the service transmission rate. This parameter change enables the ODSP to adapt to different transmission scenarios while maintaining reliable signal processing
2Adaptability or versatility
If sampling clock frequency is adjusted adaptively, then the adaptability to different bandwidth scenarios is improved, but the device complexity increases
Solution Approach 1:
The patent introduces a clock synchronization apparatus as an intermediary component between the service input and the ODSP processing unit. This apparatus includes a digital interpolator, delay element, and phase detector that work together to adjust the sampling clock frequency adaptively. By placing this intermediary layer, the system achieves adaptability to different bandwidth scenarios while isolating the complexity from the core ODSP processing unit
3Device complexity
If a fixed sampling frequency is used, then the device structure is simplified, but the productivity for processing different transmission rates is reduced
Solution Approach 1:
The patent transforms the static device structure into a dynamic one by incorporating a clock synchronization apparatus that can adjust the sampling frequency in real-time. The digital interpolator dynamically modifies the sampling clock based on the service transmission rate, enabling the system to maintain simple base structure while achieving high processing productivity across different transmission rates through dynamic adaptation
Data Source
AI summary
A clock synchronization apparatus, an optical transmitter, an optical receiver, and a clock synchronization method are provided. In the clock synchronization apparatus, a digital interpolator adjusts a sampling clock frequency of a digital signal under sampling clock control of a clock control circuit.