Optical Gain System Using Wavelength Exchange for OSNR Preservation
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Solution Overview
Problem
Higher-level modulation formats in optical networks require a higher optical signal-to-noise ratio (OSNR) that is difficult to maintain due to signal power degradation during transmission, as typical optical amplifiers add noise, limiting the transmission distance.
Innovation Solution
An optical gain system using wavelength exchange devices that multiplex an optical data signal with a pump signal onto a non-linear optical medium to generate an idler signal without significant noise, thereby suppressing OSNR degradation before amplification, allowing for increased signal power with minimal noise addition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If typical optical amplifiers are used to amplify signals, then signal power is increased, but noise is added which degrades OSNR
Solution Approach 1:
The patent introduces a wavelength exchange device as an intermediary component between the optical signal and the amplifier. This device uses optical parametric amplification with a pump signal to generate an idler signal that interferes constructively with the input signal, providing signal power enhancement without the noise addition characteristic of traditional amplifiers. The wavelength exchange device acts as a mediator that enables power gain while preserving OSNR.
2Length of moving object
If optical signals are transmitted over long distances, then transmission coverage is increased, but signal power degradation occurs
Solution Approach 1:
The patent applies preliminary action by using the wavelength exchange device to boost signal power before the signal undergoes significant power degradation during transmission. By placing the wavelength exchange device at strategic points in the transmission path, the system performs power enhancement in advance, allowing the signal to maintain acceptable power levels and OSNR over longer transmission distances without requiring traditional amplifiers that would add noise.
3Productivity
If higher-level modulation formats are used, then data transmission capacity is increased, but OSNR requirement increases which limits transmission distance
Solution Approach 1:
The patent changes the fundamental parameter of how optical signals are amplified by using optical parametric amplification instead of traditional amplification. This parameter change enables the system to provide power gain without adding noise, thereby maintaining high OSNR levels even when using higher-level modulation formats that require stricter OSNR requirements, thus enabling longer transmission distances for high-capacity data communication.
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 enables the maintenance of an acceptable OSNR even with higher-level modulation formats, allowing optical signals to be transmitted further without degrading the signal-to-noise ratio, overcoming the limitations of traditional amplifiers.
Implementation Method 1
The optical coupler may be configured to multiplex an optical data signal and an optical pump signal onto the optical medium such that an optical idler signal is generated
Implementation Method 2
an amplifier coupled to the optical medium and configured to amplify the optical data signal
Data Source
AI summary
An optical device may include a non-linear optical medium and an optical coupler coupled to the optical medium. The optical coupler may be configured to multiplex an optical data signal and an optical pump signal onto the optical medium such that an optical idler signal is generated. The power of the optical pump signal may be below a level that results in optical parametric amplification of the optical idler signal. The optical device may further include an amplifier coupled to the optical medium and configured to amplify the optical data signal.