Raman Amplifier Light Source Package for Optical Path Switching
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Solution Overview
Problem
Optical path switching in optical networks with distributed Raman amplification faces issues of high optical power loss and depolarization due to the placement of switches outside the amplifier node, which also poses safety risks and reduces the effectiveness of Raman amplification.
Innovation Solution
A light source package with separate primary and secondary lasers for each optical fibre, integrated within the Raman amplifier node, allowing for efficient switching between fibres without the need for external switches, thereby minimizing optical loss and maintaining laser depolarization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the switch is placed outside the optical amplifier node to enable optical path switching between primary and secondary fibres, then the system can restore traffic during fibre damage, but the switch experiences high optical power loss and depolarization which reduces Raman amplification effectiveness
Solution Approach 1:
The patent divides the Raman amplification system into separate functional units: a first Raman amplifier unit coupled to the primary optical fibre and a second Raman amplifier unit coupled to the secondary optical fibre. Each amplifier unit is independently configured with its own pump lasers and amplification components, allowing the system to maintain amplification effectiveness regardless of which fibre is active, thereby eliminating the need for a switch outside the amplifier node.
Solution Approach 2:
The patent introduces a controller that acts as an intermediary to manage the switching between primary and secondary optical fibres. The controller receives status information about fibre conditions and automatically activates the appropriate Raman amplifier unit and pump lasers, enabling seamless traffic restoration without requiring external switches to handle high optical powers.
2Adaptability or versatility
If the switch is placed outside the optical amplifier node, then optical path switching is enabled, but the switch introduces loss and reduces the available pump power in the optical fibre
Solution Approach 1:
The patent segments the amplification function into separate units for each optical fibre, with the second Raman amplifier unit being specifically configured to work with the secondary optical fibre. This segmentation ensures that pump power is delivered directly to the active fibre without passing through external switches, maintaining maximum pump power availability.
Solution Approach 2:
The patent implements preliminary configuration where the second Raman amplifier unit and its pump lasers are pre-configured and ready to activate immediately when the secondary optical fibre is selected. The controller is pre-programmed to automatically activate the appropriate amplifier unit upon detecting fibre damage or maintenance requirements, eliminating delays and power losses associated with switch activation.
3Adaptability or versatility
If the switch is placed outside the optical amplifier node, then path switching is possible, but the arrangement impacts the depolarisation of the lasers and reduces the effectiveness of the Raman amplification process
Solution Approach 1:
The patent segments the pump laser system into separate first and second pump laser units, each coupled to its respective Raman amplifier unit. This segmentation allows each laser unit to operate independently with optimized polarisation characteristics for its designated fibre, eliminating the depolarisation effects that would occur if a single external switch handled both paths.
Solution Approach 2:
The patent applies local quality by configuring each Raman amplifier unit with pump lasers specifically optimized for its designated optical fibre. The first pump laser unit is optimized for the primary fibre while the second pump laser unit is optimized for the secondary fibre, ensuring maximum amplification effectiveness for each path without compromising polarisation characteristics.
4Reliability
If separate pieces of equipment are used for primary and secondary optical fibres, then each fibre can be independently amplified, but the system becomes more complex and less efficient
Solution Approach 1:
The patent implements universality by designing the Raman amplifier units to be modular and interchangeable. Each unit can function independently with its own pump lasers and amplification components, but the overall system architecture allows both fibres to be managed through a unified control framework. The controller provides multi-functional capability by managing both primary and secondary fibre amplification paths, reducing the need for completely separate equipment systems.
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 configuration reduces optical loss and maintains laser depolarization, enhancing the effectiveness of Raman amplification while improving safety by eliminating the need for external switches and reducing the complexity of polarisation maintaining switches.
Implementation Method 1
Raman amplifiers are optical amplifiers based on Raman gain, which results from the effect of stimulated Raman scattering. The optical signal is amplified by providing co-propagating and/or or counter-propagating pump light
Implementation Method 2
A switch is coupled to the fibre outside the amplifier node and configured to switch optical paths between a primary optical fibre and a secondary optical fibre
Data Source
AI summary
A light source package is disclosed for a Raman amplifier node having a primary optical fiber for carrying an optical signal and a secondary optical fiber for carrying the optical signal when the signal is rerouted from the primary optical fiber. The light source package includes a primary light source for emitting light into the primary optical fiber when the optical signal is carried by the primary optical fiber to induce Raman gain of the optical signal, and a secondary light source for emitting light into the secondary optical fiber when the optical signal is carried by the secondary optical fiber to induce Raman gain of the optical signal.