Idler Carriers for Dynamic Spectral Shaping in Optical Networks
Solution Overview
Problem
The unpredictable nature of accumulated line spread in fiber-optic networks due to changes in optical carrier loading conditions leads to performance degradation, requiring large dynamic ranges in hardware design and increased complexity in power management and control loops.
Innovation Solution
The introduction of idler carriers with similar average power spectral density to data-carrying optical signal carriers at specific frequencies within the spectral band, allowing for consistent optical signal power spectra, even with additions or removals of optical carriers, thereby minimizing changes in accumulated line spread.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If optical carriers are dynamically added or removed from the transmitted optical signal power spectrum, then the spectral utilization and data capacity are improved, but the accumulated line spread becomes unpredictable and performance degrades
Solution Approach 1:
The patent introduces idler carriers as intermediary optical signals that fill unused spectral bands. These idler carriers act as mediators between the dynamic data-carrying channels and the static fiber amplifier response, maintaining consistent total optical power and spectral shape. By using idler carriers as a buffer, the system can dynamically add or remove data channels without causing unpredictable changes in accumulated line spread, thus resolving the contradiction between productivity and reliability.
2Adaptability or versatility
If the optical signal power spectrum is dynamically adjusted, then the adaptability to different loading conditions is improved, but the hardware dynamic range requirements and control complexity increase
Solution Approach 1:
The patent applies homogeneity by ensuring that idler carriers have the same average power spectral density characteristics as the data-carrying optical carriers. This homogeneous power distribution across all optical channels (data and idler) ensures that the total optical power and spectral shape remain consistent regardless of how many data channels are active. This eliminates the need for complex control loops to manage power variations, as the system naturally maintains uniformity through the homogeneous power spectral density of idler carriers.
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 approach reduces the dynamic range needed for hardware design, improves link performance by optimizing noise figures and calibration, and maintains optimal fiber loading, enhancing signal reach and capacity while simplifying power management and control requirements.
Implementation Method 1
The optical amplifier includes an Erbium Doped Fiber Amplifier
Implementation Method 2
Wave-division multiplexing is a type of multiplexing in which two or more optical carriers are multiplexed onto a single optical fiber by using different wavelengths (that is, colors) of laser light
Implementation Method 3
the first optical signal power spectrum includes a relatively flat level of amplifier noise (Amplified Spontaneous Emission (ASE))
Data Source
AI summary
A method is described in which a loss of spectrum in an optical signal having an optical signal spectrum is detected. The optical signal is transmitted from a first node to a second node. In response to detecting the loss of spectrum in the optical signal, at least one idler carrier without data imposed is supplied into the optical signal spectrum transmitted from the first node to the second node, the optical signal spectrum encompassing a frequency band including a plurality of optical channels, the idler carrier being amplified stimulated emission light having a frequency corresponding to a first optical channel of the plurality of optical channels.