Optical Repeater Supervisory Signal Transmission
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Solution Overview
Problem
Existing optical repeaters in CATV systems face challenges in supervision due to the need for costly and impractical new electrical communication lines for monitoring, especially outdoors, and the difficulty in integrating supervisory functions without affecting existing optical transmission systems.
Innovation Solution
An optical repeater system with electrical/optical conversion means connected to both center and subscriber side optical line terminations, allowing for supervisory signals to be transmitted through existing optical transmission lines without requiring new electrical or optical communication lines, using electrical signal connectors and optical network units for efficient supervision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a new electrical communication line is built to supervise the optical repeater, then the supervision reliability is improved, but the construction cost and system complexity increase significantly
Solution Approach 1:
The supervisory signal transmission function is merged with the existing optical transmission line. The optical repeater uses the same optical fiber infrastructure that carries user data to also carry supervisory signals from the OLT, eliminating the need for separate supervisory communication lines and reducing system complexity.
Solution Approach 2:
The optical transmission line is given multiple functions: it simultaneously carries user data signals and supervisory signals for monitoring the optical repeater. The OLT can send both data and supervisory commands through the same optical fiber, making the infrastructure more versatile and cost-effective.
2Adaptability or versatility
If an optical wavelength multiplexer is used to transmit supervisory signals, then the supervision function is integrated, but the cost and space requirements increase
Solution Approach 1:
The supervisory signal transmission capability is extracted from the electrical domain and integrated directly into the optical domain. By using the electrical/optical conversion means within the optical repeater itself, the system eliminates the need for separate optical wavelength multiplexing equipment, reducing both cost and space requirements.
Solution Approach 2:
The optical repeater performs its own electrical/optical conversion for supervisory signals using its built-in conversion means. The repeater converts received optical supervisory signals to electrical signals and converts electrical responses back to optical signals, eliminating the need for external conversion equipment at the repeater location.
3Length of stationary object
If the optical repeater is located outdoors at a distance from the OLT, then the transmission distance is extended, but the difficulty of supervision and maintenance increases
Solution Approach 1:
The system establishes a feedback loop where the OLT continuously sends supervisory commands to the optical repeater and receives status information in return. The electrical/optical conversion means enable bidirectional communication, allowing the remote repeater to report its operational status, power state, and error conditions back to the centralized OLT for monitoring and control.
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
Enables cost-effective and practical supervision of optical repeaters without disrupting existing systems, allowing for remote monitoring and control of optical repeaters without the need for additional infrastructure.
Implementation Method 1
the light-receiving elements 104 and 109 respectively convert optical signals output from the first and second 3 dB couplers 102 and 103 into electrical signals
Implementation Method 2
the driving circuits 106 and 111, the light-emitting elements 107 and 112 convert the signals subjected to the 3R or 2R operation into optical signals
Data Source
AI summary
An optical repeater connected to an optical transmission line between an optical network unit having an optical network unit (ONU) function on the side of a subscriber and an optical line termination (OLT) on the side of a center includes first electrical/optical conversion means connected to a first optical transmission line on the side of the center, a second electrical/optical conversion means connected to a second optical transmission line on the side of the subscriber, and transmission means connected between the first electrical/optical conversion means and the second electrical/optical conversion means to transmit an optical repeater supervisory signal between the optical transmission lines.