Coexistence Module for OTDR Testing in Optical Networks
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Solution Overview
Problem
In optical networks with ring structures, OTDR testing becomes complex due to the need for a separate fiber to bypass routers at secondary locations, making it inefficient.
Innovation Solution
The implementation of an optical testing coexistence module that uses wavelength division components to separate OTDR wavelengths from transmission wavelengths, allowing them to bypass router equipment at secondary locations on the same fiber, enabling OTDR testing without a dedicated separate fiber.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate fiber is used for OTDR testing to bypass routers at secondary locations, then OTDR testing can be performed, but fiber infrastructure complexity and cost increase
Solution Approach 1:
The patent combines OTDR testing wavelengths and transmission wavelengths onto a single fiber by using wavelength division multiplexing. The coexistence module separates incoming wavelengths, routes OTDR wavelengths through a bypass path avoiding routers, and recombines them with transmission wavelengths on the same fiber, eliminating the need for separate testing fibers.
Solution Approach 2:
The coexistence module enables the single fiber to serve multiple functions: carrying both transmission wavelengths for optical services and OTDR wavelengths for testing. The module acts as a multi-functional component that handles both service transmission and network testing on the same physical medium.
2Ease of operation
If OTDR wavelengths are routed through routers at secondary locations, then wavelength routing is simplified, but OTDR signals are blocked by router wavelength filtering
Solution Approach 1:
The patent segments the wavelength spectrum into different ranges: transmission wavelengths (1260-1625 nm) that pass through routers, and OTDR wavelengths (1625-1675 nm) that are separated and routed through a bypass path. This segmentation allows each wavelength range to be handled appropriately according to its specific requirements.
Solution Approach 2:
The coexistence module acts as an intermediary device that intercepts OTDR wavelengths before they reach the router, redirects them through a bypass path, and then recombines them with transmission wavelengths. This intermediary function protects the router from receiving inappropriate wavelengths while ensuring OTDR signals reach their destination.
3Reliability
If dedicated separate fiber is installed for OTDR testing, then testing can be performed, but bandwidth utilization decreases
Solution Approach 1:
The patent merges OTDR testing traffic and transmission traffic onto a single fiber using wavelength division multiplexing. By separating wavelengths at the coexistence module and recombining them downstream, the system maximizes fiber utilization while maintaining both testing and transmission functions simultaneously.
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
This solution reduces the need for additional fiber installation, enhances bandwidth utilization, and allows for efficient OTDR testing across the network by recombining signals on a common downstream fiber, thereby identifying transmission loss locations and detecting discontinuities in optical services.
Implementation Method 1
a first wavelength division component configured for receipt of optical signals within a transmission wavelength range and a testing wavelength range that is outside of the transmission wavelength range. The first wavelength division component is configured for separation of the optical signals onto a transmission optical path carrying the transmission wavelength range and optically connectable to optical distribution equipment, and a bypass optical path carrying the testing wavelength range.
Implementation Method 2
a second wavelength division component configured to receive the transmission wavelength range via a transmission fiber connection from the optical distribution equipment and the testing wavelength range via the bypass path, the second wavelength division component recombining the received optical signals in the transmission wavelength range and the testing wavelength range onto a common downstream optical fiber.
Data Source
AI summary
A coexistence module usable at secondary locations within a routing optical network is disclosed, which accommodates OTDR testing on the optical network without requiring a separate, dedicated fiber connected between secondary locations for such testing. Rather, a filter arrangement is used in which OTDR wavelengths are separated from transmission wavelengths and optically connected to bypass router equipment at the secondary location.