Auxiliary Transceiver Carrier Wave Frequency Control
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Solution Overview
Problem
Conventional carrier wave frequency control in optical transmission systems is inaccurate due to fluctuations in bit error rate caused by crosstalk and fiber nonlinear optical effects, leading to imprecise correction of frequency deviations.
Innovation Solution
A communication apparatus with multiple transceivers, a multiplexing unit for frequency multiplexing, an auxiliary transceiver for generating correction signals, and a control unit to accurately control carrier wave frequencies by mixing interference between frequency multiplexing signals and local emission light signals, allowing for precise frequency correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If bit error rate is used for carrier wave frequency control, then frequency correction can be performed, but measurement precision deteriorates due to fluctuations caused by crosstalk and fiber nonlinear optical effects
Solution Approach 1:
The patent introduces an auxiliary transceiver as an intermediary device that generates a test signal independent of the main transmission channels. This auxiliary transceiver mixes the frequency multiplexing signal with a local emission light signal to produce a control signal that directly indicates frequency deviation, bypassing the unreliable bit error rate measurement that is affected by crosstalk and nonlinear effects in the transmission path.
2Productivity
If high-density frequency multiplexing is implemented, then communication capacity increases, but frequency deviation causes crosstalk between subcarriers leading to characteristic deterioration
Solution Approach 1:
The patent implements a feedback control mechanism where the auxiliary transceiver continuously monitors the frequency deviation of each transceiver by mixing its output with the frequency multiplexing signal. The generated control signal provides real-time feedback about frequency deviations, enabling the system to actively compensate and maintain accurate frequency intervals between subcarriers, thereby preventing crosstalk while preserving high-density multiplexing capabilities.
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 apparatus achieves high-accuracy control of carrier wave frequencies, maintaining stable frequency intervals and correcting deviations caused by wavelength variable light source aging, even during system operation.
Implementation Method 1
an auxiliary transceiver to perform mixing interference of the frequency multiplexing signal and a local emission light signal having a same frequency setting as a carrier wave frequency used in a control target transceiver, to generate and output a control signal for correcting the carrier wave frequency
Data Source
AI summary
A communication apparatus including: an optical transmission device including transceivers to transmit and receive optical signals at carrier wave frequencies different from one another; a multiplexing unit to subject the optical signals input from the transceivers to frequency multiplexing; an auxiliary transceiver to perform mixing interference of a frequency multiplexing signal and a local emission light signal having the same frequency setting as a carrier wave frequency used in a control target transceiver, to generate and output a control signal for correcting the carrier wave frequency of the control target transceiver, the auxiliary transceiver being a spare transceiver for the plurality of transceivers; and a control unit to perform control to output, to the control target transceiver, the control signal input from the auxiliary transceiver.