Optical Node Rotation Angle Deviation Compensation
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Solution Overview
Problem
Existing optical nodes lack means to check for minimum connection loss and recover optical fiber core positions deviated due to disturbances like motor vibration, leading to potential excessive loss and misalignment in optical switches.
Innovation Solution
An optical node system that inputs test light, rotates optical switches by minute angles to maximize optical intensity, and stores optimal rotation angles for each channel, using a control unit to perform rotation angle deviation compensation and update a database, thereby compensating for deviations and reducing connection loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If optical switches are used without rotation angle deviation compensation, then device complexity is reduced, but connection loss increases due to misalignment
Solution Approach 1:
The system measures actual optical intensity after rotation and uses this feedback to determine the optimal rotation angle, storing it for future operations. This closed-loop feedback mechanism ensures minimal connection loss while maintaining system simplicity.
Solution Approach 2:
The system performs rotation angle optimization in advance and stores the optimal angles in a database. When switching occurs, the pre-determined optimal angle is retrieved and applied, avoiding the need for real-time optimization during actual switching operations.
2Speed
If motor-driven optical fiber rotation is used, then switching speed is improved, but reliability deteriorates due to vibration and sliding causing core position deviation
Solution Approach 1:
The system continuously monitors optical intensity and uses this information to detect and correct core position deviations caused by vibration or sliding, ensuring reliable alignment despite mechanical disturbances.
Solution Approach 2:
The system dynamically adjusts the rotation angle parameter based on measured optical intensity, allowing the optical fiber core position to be realigned after deviations caused by mechanical disturbances.
3Manufacturing precision
If no optical intensity measurement is performed, then device complexity is reduced, but manufacturing precision deteriorates due to inability to verify minimum connection loss
Solution Approach 1:
The optical intensity measurement provides feedback on connection quality, allowing the system to verify optimal alignment and ensure minimum connection loss without requiring complex manufacturing processes.
Solution Approach 2:
The system performs self-verification of connection quality through optical intensity measurement, eliminating the need for external verification equipment or complex manufacturing precision requirements.
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
The system effectively compensates for rotation angle deviations in optical fiber cores, reducing connection loss and ensuring reliable optical switching operations.
Implementation Method 1
an optical switch which switches a plurality of channels by rotating an input-side ferrule in which centers of one or a plurality of optical fiber cores are arranged on a circumference of a circle centered on a center in a cross section perpendicular to a long axis direction, and an output-side ferrule in which the centers of one or a plurality of optical fiber cores are arranged on a circumference of a circle centered on a center in a cross section perpendicular to a long axis direction, abut each other with central axes thereof in the long axis direction aligned
Implementation Method 2
an optical port monitoring unit which performs optical intensity measurement of optical test light output from the output side port
Implementation Method 3
an optical node control unit which extracts a rotation angle of the optical switch at which the optical intensity of the optical test light becomes a maximum value, and performs rotation angle deviation compensation for updating a database indicating the rotation angle of each designated channel
Data Source
AI summary
An object of the present invention is to provide an optical node capable of compensating for a rotation angle deviation of an optical fiber core of a ferrule rotation type optical switch and reducing a connection loss generated in the optical switch.An optical node according to the present disclosure includes: an input-side optical port to which optical test light is input; a first optical switch connected to the input-side optical port and having a plurality of channels; a first rotation mechanism that rotates the first optical switch; a second optical switch connected to the first optical switch and having a plurality of channels; a second rotation mechanism that rotates the second optical switch; an output-side port which is connected to the second optical switch and from which the optical test light is output; an optical port monitoring unit that performs optical intensity measurement of the optical test light passing through the output-side port; and an optical node control unit that is connected to the first rotation mechanism, the second rotation mechanism, and the optical port monitoring unit, causes the optical port monitoring unit to perform the optical intensity measurement after rotating the optical switch by a minute angle for each of a designated channel of the first optical switch and a designated channel of the second optical switch, extracts a rotation angle of the optical switch at which the optical intensity of the optical test light becomes a maximum value, and performs rotation angle deviation compensation for updating a database representing the rotation angle of each designated channel.