Ring Filter Wavelength Modulation for Optical Link BER
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Solution Overview
Problem
Optical communication networks face increased bit error rates due to spectral filtering caused by ring filters, which attenuate optical sidebands and reduce signal quality.
Innovation Solution
Periodically varying the central wavelength of ring filters at both transmitters and receivers, using control signals to adjust the resonance frequency in synchronization with data signal frequencies, thereby minimizing attenuation and enhancing signal strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If ring filters are used for spectral filtering in optical communication, then signal routing and wavelength selection are improved, but optical sidebands are attenuated and bit error rate increases
Solution Approach 1:
The patent applies periodic modulation to the resonance frequency of the ring filter at the receiver端, synchronizing it with the data signal frequency. This periodic action creates constructive interference that recovers the attenuated optical sidebands, thereby reducing bit error rate while maintaining the wavelength selection capability provided by the ring filter structure
Solution Approach 2:
The patent dynamically changes the resonance frequency parameter of the ring filter by applying a control signal that modulates it at the data signal frequency. This parameter change allows the filter to periodically align with the optical sidebands, compensating for the attenuation caused by spectral filtering and improving signal reliability
2Productivity
If ring filters attenuate optical sidebands for spectral filtering, then wavelength division multiplexing is enabled, but signal strength is reduced and transmission reliability deteriorates
Solution Approach 1:
The patent converts the harmful attenuation effect of the ring filter into a beneficial effect by applying periodic modulation. The same ring filter structure that causes sideband attenuation is made to resonate at the data signal frequency, transforming it into a signal enhancement mechanism that recovers and amplifies the attenuated optical sidebands through constructive interference
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
This approach improves the bit error rate by maintaining signal strength and reducing attenuation, leading to more reliable data transmission in optical communication networks.
Implementation Method 1
a resonant wavelength of the receiver ring filter
Implementation Method 2
Periodically varying the central wavelength of ring filters at both transmitters and receivers, using control signals to adjust the resonance frequency
Data Source
AI summary
An optical transceiver module includes an optical transceiver and a controller. The optical transceiver has a ring filter configured to transmit optical signals from or receive optical signals for the optical transceiver module. The controller is configured to: detect a carrier frequency at the optical transceiver; detect a data signal frequency of data at the optical transceiver; determine a bit error rate of the data; and in response to determining that the bit error rate of the data is greater than a threshold, periodically vary a central wavelength of the ring filter at a frequency at least three orders slower than the data signal frequency.