Optical Path Opening with Dual-Wavelength Control Signal Reception
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Solution Overview
Problem
Subscriber devices in optical communication systems cannot receive downlink control signals due to mismatched wavelength filters before and after optical path opening, preventing effective communication and control channel establishment.
Innovation Solution
Implementing a communication device with separate reception units for optical signals of predetermined and different wavelengths, using optical multiplexing/demultiplexing means to transmit and receive downlink control signals before and after path opening, and configuring wavelength filters to match these signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the optical path is opened directly to enable high-speed communication between subscriber devices, then communication speed and capacity are improved, but the control channel for transmitting control signals from the control unit to the subscriber device is cut off
Solution Approach 1:
The optical communication system is segmented into two independent transmission paths: a high-speed optical path for data communication and a control path for management signals. This segmentation allows both functions to operate simultaneously without interference, resolving the contradiction between high-speed communication and control signal transmission.
Solution Approach 2:
An optical multiplexing/demultiplexing means acts as an intermediary device that combines and separates optical signals of different wavelengths. It enables the control unit to transmit downlink control signals through the optical fiber transmission line without blocking the high-speed data path, thus maintaining both communication speed and control capability.
2Loss of information
If a management control port is provided for communication with the subscriber device after optical path opening, then control signal transmission is improved, but the wavelength filter in the subscriber device blocks the downlink control signal if the wavelength is not within the transmission wavelength band
Solution Approach 1:
The system changes the wavelength parameter of the downlink control signal to match the transmission wavelength band of the subscriber device's wavelength filter. By adjusting this parameter, the control signal can pass through the wavelength filter without being blocked, enabling successful communication after optical path opening.
Solution Approach 2:
The optical multiplexing/demultiplexing means performs preliminary wavelength selection and signal preparation before the control signal reaches the subscriber device. This preliminary action ensures that the control signal's wavelength is compatible with the subscriber device's wavelength filter, preventing blocking in advance.
3Loss of information
If the wavelength of the downlink control signal is changed to match the transmission wavelength band, then the subscriber device can receive the control signal, but the optical multiplexing/demultiplexing means cannot simultaneously transmit the main signal
Solution Approach 1:
The optical multiplexing/demultiplexing means segments the optical spectrum into different wavelength bands for control signals and main signals. This wavelength division allows both types of signals to be transmitted simultaneously without interference, maintaining both control signal reception and overall transmission capacity.
Solution Approach 2:
The system transitions from a single-wavelength transmission approach to a multi-wavelength approach, utilizing the wavelength dimension to carry both control and main signals. This dimensional expansion allows the system to maintain high productivity while enabling proper control signal reception.
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 continuous reception of downlink control signals by subscriber devices, allowing for effective optical path management and control signal exchange before and after path opening, ensuring seamless communication and monitoring.
Implementation Method 1
an optical multiplexing/demultiplexing means is provided on an optical fiber transmission line and an optical signal carrying a main signal and an optical signal carrying a control signal are multiplex or demultiplexed
Implementation Method 2
the wavelength of the downlink control signal transmitted from the management control port for communication with the subscriber device before the optical path opening is not within a transmission wavelength band of a wavelength filter provided in the subscriber device
Data Source
AI summary
A communication device is a first communication device in an optical communication system including the first communication device, a second communication device, and a control device that controls opening of an optical path between the first communication device and the second communication device, and the communication device includes a first reception unit configured to receive a downlink control signal that is an optical signal having a predetermined wavelength transmitted from the control device; and a second reception unit configured to receive a main signal that is an optical signal having a wavelength different from the predetermined wavelength transmitted from the second communication device.