Centralized Chromatic Dispersion Compensation for Split Optical Paths
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Solution Overview
Problem
In optical communication systems that use split fibers for multiple access, such as PONs, the varying lengths of optical transmission lines between the central unit and distributed units result in different amounts of chromatic dispersion, requiring individual compensation. This leads to increased installation costs due to the need for chromatic dispersion compensation modules at distant distributed units.
Innovation Solution
An optical communication system is configured with a central unit connected to a chromatic dispersion compensation device. This device includes a unit that splits the optical transmission line into multiple paths, each connected to a distributed unit. The system uses a chromatic dispersion compensation unit that performs compensation based on the average chromatic dispersion amount across all paths, reducing the need for multiple compensation modules at each distributed unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If chromatic dispersion compensation modules are installed at each distributed unit to compensate for varying chromatic dispersion amounts, then signal quality is improved, but installation cost and device complexity increase
Solution Approach 1:
The patent consolidates multiple chromatic dispersion compensation modules into a single centralized module at the optical communication device. This centralized module compensates for chromatic dispersion across multiple optical transmission lines with different lengths, eliminating the need for separate compensation modules at each distributed unit while maintaining signal quality.
Solution Approach 2:
The chromatic dispersion compensation module is designed to serve multiple optical transmission lines simultaneously. By configuring the module to handle varying chromatic dispersion amounts across different paths, a single module performs the function that previously required multiple dedicated modules, reducing overall system complexity.
2Reliability
If chromatic dispersion compensation modules are installed at distant distributed units, then chromatic dispersion is compensated accurately, but labor cost and facility cost increase
Solution Approach 1:
The patent merges the chromatic dispersion compensation function from multiple distributed units into a single centralized location. This eliminates the need for field installations at distant units, significantly reducing labor costs and facility costs while maintaining compensation accuracy through proper module configuration.
Solution Approach 2:
Instead of physically installing compensation modules at each distributed unit, the system uses a single centralized module that virtually serves all paths. The module is configured to compensate for the chromatic dispersion characteristics of multiple optical transmission lines with different lengths, effectively copying the compensation function across all paths without physical presence at each endpoint.
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 effectively improves signal quality by compensating for chromatic dispersion while minimizing construction costs, particularly labor and facility costs, by centralizing the chromatic dispersion compensation and eliminating the need for individual module installations at distant units.
Implementation Method 1
when an optical signal propagates through an optical fiber, waveform distortion occurs due to the chromatic dispersion effect of the optical fiber. Chromatic dispersion is a phenomenon caused as the propagation speed of an optical signal through an optical fiber differs depending on the wavelength of the signal.
Implementation Method 2
Waveform distortion resulting from chromatic dispersion can be compensated for by using a dispersion compensation fiber (hereinafter referred to as a 'DCF') with a chromatic dispersion property opposite to that of an optical fiber
Implementation Method 3
an optical splitter 131 is a 1:N optical splitter that splits a path at one end thereof into N paths
Data Source
AI summary
An optical communication system includes a first optical communication device; a plurality of second optical communication devices configured to perform communication with the first optical communication device; a chromatic dispersion compensation device connected to the first optical communication device; and an optical transmission line connected to the chromatic dispersion compensation device, a path of the optical transmission line connected to the chromatic dispersion compensation device being split into a plurality of paths at a branch point, the resulting paths being respectively connected to the plurality of second optical communication devices, and the optical transmission line being configured to transmit optical signals through the paths, in which the chromatic dispersion compensation device includes a chromatic dispersion compensator configured to perform chromatic dispersion compensation corresponding to amounts of chromatic dispersion generated in optical signals propagated through respective paths between the first optical communication device and the plurality of second optical communication devices.