Separate Supervisory Light Amplifier for Reliable OSC Transmission
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Solution Overview
Problem
Conventional optical communication systems face reliability issues due to increased transmission path losses as the repeating distance lengthens, particularly for supervisory light, which is often amplified alongside main signal light using the same optical amplifiers, leading to potential failures in both signals if the amplifiers malfunction.
Innovation Solution
An optical transmission apparatus with a supervisory light amplifying device separate from the main signal light amplifiers, allowing for independent amplification and power control of supervisory light, ensuring reliable transmission even with large span losses, and reducing the need for Raman amplification of supervisory light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same optical amplifier is used for both main signal light and supervisory light, then device complexity is reduced, but reliability deteriorates because both signals fail if the amplifier malfunctions
Solution Approach 1:
The patent divides the amplification function into separate units: a main signal light amplifier for amplifying main signal light and a supervisory light amplifier for amplifying supervisory light. This segmentation ensures that failures in one amplifier do not affect the other signal, thereby improving reliability while maintaining manageable system complexity through modular design.
2Loss of energy
If Raman amplification is applied to both main signal light and supervisory light, then transmission loss is reduced, but power consumption increases due to additional pumping light
Solution Approach 1:
The patent extracts the Raman amplification function for supervisory light from the main signal light Raman amplification system. By providing a separate supervisory light amplifier, the system avoids the need for additional pumping light sources for supervisory light Raman amplification, thereby reducing power consumption while still achieving effective amplification of both signal types.
3Device complexity
If supervisory light is transmitted without separate amplification, then device complexity is reduced, but transmission characteristic deterioration occurs over long distances
Solution Approach 1:
The supervisory light amplifier is designed to independently amplify supervisory light without requiring coordination with the main signal light amplification system. This self-service capability allows the supervisory light to maintain its transmission characteristics over long distances through dedicated amplification, improving reliability while keeping the added complexity minimal through autonomous operation.
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 configuration ensures high reliability by maintaining normal supervisory light transmission even if main signal light transmission fails, enabling quick fault identification and recovery, while reducing power consumption and increasing safety by minimizing the total power of pumping light.
Implementation Method 1
a supervisory light amplifying device for amplifying the supervisory light
Implementation Method 2
the transmission path distributed Raman amplification (DRA) such as known from the document; M. Takeda et al., 'Active Gain-Tilt Equalization by Preferentially 1.43 μm- or 1.48 μm-Pumped Raman Amplification'
Data Source
AI summary
An optical communication system, where in an optical transmission apparatus arranged on a transmission side of respective repeating sections, an OSC optical amplifier is provided on an OSC light optical path between from an OSC transmitter to a multiplexer, and the OSC optical amplifier is controlled so that the power of OSC light transmitted on the transmission path becomes a previously set target value. As a result the OSC light is amplified by a different amplifying device to that for the main signal lights at the time of transmission. Therefore even in the case where the span losses are large, OSC light can be reliably received by the optical transmission apparatus on the reception side.