Bandwidth Variable Optical Communication Adaptation
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Solution Overview
Problem
Conventional optical communication networks inefficiently use frequency resources due to fixed bandwidth allocation, leading to excessive spectrum bandwidth assignment even for paths with mild transmission specifications, resulting in wasted resources and increased costs.
Innovation Solution
A bandwidth variable communication technique that dynamically selects a combination of modulation level and symbol rate based on optical signal quality deterioration, allowing for adaptive spectrum bandwidth adjustment to optimize frequency resource use, while maintaining constant bit rates across optical paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed bandwidth allocation is used for all optical paths, then transmission reliability is ensured for the longest path, but frequency resource efficiency deteriorates due to excessive bandwidth assignment for shorter paths
Solution Approach 1:
The patent applies local quality by allocating different bandwidths to different optical paths based on their specific transmission characteristics. Each optical path receives a bandwidth tailored to its length and signal quality requirements, rather than a uniform allocation. This resolves the contradiction by ensuring sufficient bandwidth for reliable transmission on long paths while minimizing excessive bandwidth allocation on shorter paths, thereby improving overall frequency resource efficiency.
Solution Approach 2:
The patent implements dynamic bandwidth allocation where the bandwidth for each optical path is adjusted according to its specific transmission distance and signal quality deterioration. The system dynamically determines the minimum necessary bandwidth for each path based on real-time or pre-calculated transmission characteristics, allowing the network to adapt bandwidth allocation to actual needs rather than using fixed assignments, thus resolving the contradiction between reliability and resource efficiency.
2Reliability
If excessive spectrum bandwidth is assigned to optical paths with mild transmission specifications, then transmission reliability is maintained, but resource waste increases and network costs rise
Solution Approach 1:
The patent applies parameter changes by adjusting the bandwidth parameter for each optical path according to its specific transmission requirements. The system changes the bandwidth parameter dynamically or based on pre-calculated parameters, assigning smaller bandwidths to paths with mild transmission specifications and larger bandwidths to paths requiring more robust transmission. This resolves the contradiction by optimizing the bandwidth parameter to match actual transmission needs, reducing resource waste while maintaining reliability.
Solution Approach 2:
The patent applies partial action by allocating only the necessary portion of spectrum bandwidth required for each optical path rather than assigning excessive bandwidth uniformly. The system calculates the minimum necessary bandwidth for each path based on transmission distance and signal quality requirements, assigning just enough resources to maintain reliability without the excess that would cause waste and increased costs.
3Ease of manufacture
If uniform bandwidth allocation is used across all optical paths, then implementation simplicity is maintained, but frequency resource utilization efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-calculating or pre-determining the optimal bandwidth for each optical path based on transmission distance and signal quality characteristics. These bandwidth allocations are determined in advance and stored in the system, allowing the network to efficiently assign appropriate bandwidths without complex real-time calculations while still achieving optimized frequency resource utilization. This resolves the contradiction by preparing bandwidth allocation parameters beforehand, maintaining operational simplicity while improving resource efficiency.
Data Source
AI summary
A bandwidth variable communication method is provided that enables effective use of frequency bandwidths in which the bit rate is constant in every optical path. The bandwidth variable communication method includes, when a network management apparatus sets or changes an optical path that passes through plural communication apparatuses, measuring or obtaining an optical signal quality deterioration amount in a route of the optical path; selecting a modulation format in which a spectrum bandwidth is the narrowest from among modulation formats by which transmission is available on conditions of the optical signal quality deterioration amount and a desired bit rate B (bit/s); and exchanging control information between the network management apparatus and a control unit of each communication apparatus on the optical path route. A bandwidth variable communication apparatus receives the control information, and changes a passband based on the received control information.