Optical Frequency Control for Multi-Subcarrier Reception
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Solution Overview
Problem
In high-capacity optical communications systems, reducing the number of optical reception front ends while maintaining effective reception characteristics is challenging due to frequency drifts in light sources, which can lead to degraded reception characteristics if the band characteristics of the optical reception front end are not sufficiently achieved.
Innovation Solution
An optical communications system with a light source frequency control system that monitors and adjusts the frequency offsets of subcarrier signals, allowing each optical reception front end to receive multiple subcarrier signals and control the light source frequencies on both the transmitting and receiving sides to maintain optimal alignment within the band characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the number of optical reception front ends is reduced below the number of subcarrier signals, then system integration and size reduction are achieved, but reception characteristics are degraded due to frequency offsets
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the bandwidth of the optical reception front end to adapt to frequency offsets. The control unit monitors frequency offsets of subcarrier signals and adjusts the reception bandwidth parameter accordingly, allowing a reduced number of front ends to maintain effective reception by optimizing their operational parameters in real-time.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the frequency offsets of subcarrier signals received by each optical reception front end. The control unit uses this feedback information to adjust the bandwidth parameters of the front ends, creating a closed-loop system that maintains optimal reception characteristics despite frequency drift and reduced hardware quantity.
2Speed
If frequency drift occurs in light sources, then frequency offsets of subcarrier signals increase, but bandwidth requirements exceed the band characteristics of the optical reception front end
Solution Approach 1:
The patent applies dynamics by making the bandwidth of the optical reception front end adjustable rather than fixed. The control unit dynamically changes the reception bandwidth based on the magnitude of frequency offsets, allowing the system to adapt to varying frequency drift conditions and maintain proper signal extraction across different operational scenarios.
Solution Approach 2:
The patent changes the bandwidth parameter of the optical reception front end in response to frequency drift. By monitoring frequency offsets and adjusting the reception bandwidth parameter accordingly, the system maintains the ability to properly extract subcarrier signals even when light source frequency drift causes expanded bandwidth requirements.
Data Source
AI summary
The receiving-side system (10) includes a smaller number of optical reception front ends (12) than the number of a plurality of wavelength-multiplexed subcarrier signals. Each of the optical reception front ends (12) is configured to receive two or a plurality subcarrier signals of the plurality of subcarrier signals. A frequency offset monitoring unit (22) monitors frequency offsets of the respective subcarrier signals received by the optical reception front end (12). A light source frequency control unit (24) controls at least one of a light source frequency of the transmitting-side system (2) and a light source frequency of the receiving-side system (10) based on a result of the monitoring performed by the frequency offset monitoring unit (22).