Optical Path Control for Nonoverlapping Uplink and Downlink Signals
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In optical communication systems, uplink control signals at the same wavelength as main signals can interfere with downlink control signals, causing interference and preventing correct reception of downlink control signals by subscriber devices.
Innovation Solution
A communication control device that includes a detection unit to identify the transmission timing of uplink control signals, a determination unit to set the timing of downlink control signals to avoid overlap, and a transmission unit to send downlink control signals at determined timings using time division multiplexing to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If optical multiplexing/demultiplexing means is provided to transmit both main signal and control signal on the optical fiber transmission path, then the control channel is established for transmitting control signals after optical path opening, but uplink control signals at the same wavelength as main signal interfere with downlink control signals at different wavelength
Solution Approach 1:
The patent applies periodic action by implementing time-division multiplexing where uplink control signals and downlink control signals are transmitted in different time slots. The transmission timing of downlink control signals is determined based on the transmission timing of uplink control signals to ensure they do not overlap, thereby preventing interference while maintaining the control channel functionality.
2Reliability
If downlink control signal is transmitted at a different wavelength from main signal, then the control signal can be separated from main signal, but it may overlap in timing with uplink control signal at same wavelength as main signal causing interference
Solution Approach 1:
The patent uses periodic action by implementing time-division multiplexing where uplink control signals and downlink control signals are transmitted in different time slots. The transmission timing of downlink control signals is determined based on the transmission timing of uplink control signals to ensure they do not overlap, thereby preventing interference while maintaining the control channel functionality.
3Speed
If optical path is opened directly between subscriber devices, then communication speed is maximized, but control channel between subscriber device and management control unit is cut off
Solution Approach 1:
The patent applies segmentation by separating the control signal transmission path from the main signal transmission path. Optical multiplexing/demultiplexing means are provided on the optical fiber transmission path to multiplex and demultiplex optical signals carrying main signals and control signals, respectively. This allows the optical path to be opened for high-speed communication while maintaining a separate control channel through the multiplexing infrastructure.
Data Source
AI summary
A communication control device that controls setting of an optical path between a first communication device and a second communication device includes: a detection unit that detects a main signal on which an uplink control signal transmitted from the first communication device is superimposed and detects a transmission timing of the uplink control signal; a determination unit that determines a transmission timing of a downlink control signal so as not to overlap with the transmission timing of the uplink control signal on the basis of the transmission timing of the uplink control signal detected by the detection unit and a predetermined control signal transmission rule; and a transmission unit that transmits the downlink control signal to the second communication device at the transmission timing of the downlink control signal determined by the determination unit.