DWDM Optical Network Node Centralized Laser Bank
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Solution Overview
Problem
Conventional DWDM optical systems are inadequate for handling dynamic traffic due to unpredictable optical power at amplifiers, leading to transit noise, large variations in received signal and clock phase, and slow switching times between wavelengths, making them unsuitable for burst mode traffic.
Innovation Solution
An optical network node with a centralized laser bank that modulates and transmits DWDM signals, using optical amplifiers to maintain consistent input and output power levels, and employs a clock recovery unit to align data-clock phases, allowing for dynamic reconfiguration without wavelength pre-assignments and reducing the need for lasers at individual nodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional DWDM optical systems use optical amplifiers for power management, then optical power can be amplified, but unpredictable optical power results in transit noise and large variations in received signal
Solution Approach 1:
An optical power splitter is introduced as an intermediary device between the optical amplifier and receivers. The splitter divides the amplified optical signal into multiple portions with predictable power distribution, eliminating the unpredictability caused by direct amplifier output while maintaining the benefit of optical power amplification. This mediator stabilizes the received signal by ensuring consistent power levels at each receiver input.
2Adaptability or versatility
If conventional DWDM systems use multiple lasers at individual nodes for wavelength switching, then dynamic traffic handling is possible, but system complexity and cost increase
Solution Approach 1:
Multiple laser sources that would traditionally be distributed across individual nodes are merged into a single centralized optical laser bank. This consolidated laser bank generates all required DWDM wavelengths and distributes them through optical fibers to various network nodes. The merging eliminates the need for each node to maintain its own laser array, significantly reducing system complexity and cost while preserving dynamic traffic handling capabilities through centralized control of the laser bank.
3Device complexity
If conventional DWDM systems pre-assign wavelengths for static traffic, then optical power management is simplified, but adaptability to dynamic traffic is reduced
Solution Approach 1:
The system transitions from static wavelength pre-assignment to dynamic wavelength allocation. The centralized laser bank can dynamically adjust which wavelengths are active and route them to different nodes based on real-time traffic demands. This dynamic approach allows the system to adapt to varying traffic patterns while the optical power splitter maintains simplified power management by consistently dividing the available optical power regardless of which wavelengths are currently in use.
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 enables efficient, scalable, and cost-effective DWDM networks capable of handling dynamic traffic, reducing system complexity and power consumption while maintaining reliable communication over metropolitan distances.
Implementation Method 1
a modulator having an input optical power and an output optical power, the modulator comprising a Mach-Zehnder interferometer (MZI) with a first arm and a second arm, each arm having a respective electro-optic modulator
Data Source
AI summary
A dense wavelength-division multiplexing (DWDM) optical network includes an optical input port configured to receive unmodulated optical signals from the optical fiber comprising wavelength channels; one or more modulators coupled to the optical input port wherein the one or more modulators are each configured to modulate a respective first wavelength channel of the wavelength channels with respective data to produce a modulated first wavelength channel when the modulator is in a transmit state; wherein an input optical power of each modulator is kept at substantially a first level and an output optical power of the each modulator is kept at substantially a second level during operation of the modulator. A method and an optical network node are also disclosed therein.