Flexible Grid Optical Spectrum Management via Data Model Segmentation
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Solution Overview
Problem
The existing fixed grid approach in optical networks is inadequate for managing high-speed optical channels and supercarriers, as it restricts spectral efficiency and flexibility, especially with the advancement of coherent modems exceeding 50 GBaud symbol rates, and fails to efficiently accommodate future generations of modems.
Innovation Solution
The implementation of a data model using Media Channel (MC) and Network Media Channel (NMC) models to manage optical spectrum, allowing flexible grid allocation, decoupling optical control granularity from modem spectrum assignment, and enabling efficient use of optical spectrum across various network topologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed grid approach is used for optical channel assignment, then the network management is simple and straightforward, but the spectral efficiency decreases and flexibility is lost for high-speed modems exceeding 50 GBaud
Solution Approach 1:
The patent segments the optical spectrum into flexible grid channels with variable bandwidth allocations. Instead of a uniform fixed grid, the spectrum is divided into segments that can be dynamically assigned different widths based on the specific requirements of each optical channel and modem type, allowing efficient accommodation of high-speed modems exceeding 50 GBaud while maintaining organized network management through the structured channel assignment framework
Solution Approach 2:
The patent implements dynamic spectrum allocation where the bandwidth of each optical channel can be adjusted based on the symbol rate and spectral requirements of the connected modem. This dynamic approach allows the network to adapt to different modem generations and speed requirements, optimizing spectral efficiency for high-speed applications while preserving the ability to manage lower-speed channels with simpler allocations
2Device complexity
If the optical channel is tightly coupled with the physical port, then the data model is simple, but the adaptability to future modem technologies and flexible grid allocations is limited
Solution Approach 1:
The patent segments the data model into separate functional components: a flexible grid channel assignment layer that handles spectrum allocation independently, and a physical port layer that manages hardware interfaces. This segmentation allows the channel assignment logic to evolve with future modem technologies without requiring changes to the underlying physical port data model, enhancing adaptability while maintaining manageable complexity through modular design
Solution Approach 2:
The patent introduces an intermediary flexible grid channel assignment mechanism between the physical port and the optical spectrum. This intermediary layer acts as an abstraction that decouples the direct coupling, allowing the physical port data model to remain relatively simple while the flexible grid layer provides the adaptability needed for future modem technologies and dynamic spectrum allocations
Data Source
AI summary
A controller includes a processor; and memory storing instructions that, when executed, cause the processor to obtain measurements of optical spectrum from an Optical Power Monitor (OPM) connected to a fiber having thereon, one or more optical signals from one or more optical transmitters, wherein the optical signals are based on a flexible grid, manage the one or more optical signals utilizing a first model and manage attenuation control granularity of a Wavelength Selective Switch (WSS) connected to the fiber utilizing a second model, and configure one or more of the WSS and the one or more optical transmitters based on the first model and the second model.