Optical Signal Processing via Idler Light Generation
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Solution Overview
Problem
In optical communication systems, the conversion between optical and electric signals at repeater nodes leads to complex equipment and high power consumption, and branching carrier light for signal multiplexing results in power loss and inefficiency.
Innovation Solution
An optical signal processing apparatus that uses a nonlinear optical medium, an optical combiner, and an optical splitter to generate idler light, which allows for data signal multiplexing and reception without branching the carrier light, thereby reducing power loss and equipment complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If carrier light is branched from optical transmission line to receive signals, then signal reception is enabled, but power loss is exerted on carrier light
Solution Approach 1:
The patent uses a nonlinear optical medium to generate idler light as a copy of the carrier light. The idler light contains the same signal information as the carrier light but at a different wavelength. By receiving signals from the idler light instead of branching the carrier light, the system avoids power loss to the transmission line while still enabling signal reception.
Solution Approach 2:
The patent introduces idler light as an intermediary carrier. The idler light acts as a mediator between the carrier light and the receiver. It is generated through four-wave mixing in a nonlinear optical medium using the carrier light and control light, and serves as the actual signal carrier for reception without affecting the original carrier light in the transmission line.
2Ease of operation
If conversions between optical signals and electric signals are used in repeater nodes, then signal processing is enabled, but equipment structure becomes complicated and power consumption increases
Solution Approach 1:
The patent replaces the conventional optical-electric-optical conversion system with a fully optical signal processing system. Instead of converting signals to electric signals for processing and back to optical signals, the system uses optical mixing in a nonlinear optical medium to directly process signals in the optical domain, eliminating the need for electro-optical converters and reducing system complexity.
Solution Approach 2:
The patent combines multiple functions into a single optical processing stage. The nonlinear optical medium simultaneously performs signal mixing, wavelength conversion, and signal generation in one component, replacing what would traditionally require separate optical-electric converters, electric signal processors, and optical modulators distributed throughout the system.
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 data signal multiplexing and reception without affecting the carrier light's power or signal-to-noise ratio, reducing power loss and maintaining efficient energy use in optical communication systems.
Implementation Method 1
a nonlinear optical medium through which carrier light propagates; an optical combiner configured to optically combine control light for generating idler light of the carrier light with the carrier light
Data Source
AI summary
In an optical signal processing apparatus, carrier light propagates through a nonlinear optical medium. An optical combiner optically combines output control light for generating idler light of the carrier light with the carrier light. An optical splitter splits the idler light from the carrier light. A receiver acquires a signal multiplexed on the carrier light from the idler light split by the optical splitter.