Optical Receiver Amplitude Control for Wavelength Dispersion
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Solution Overview
Problem
In digital coherent reception systems, the existing methods for controlling dynamic range in analog/digital conversion do not effectively adjust reception sensitivity according to varying wavelength dispersion, leading to suboptimal signal resolution and sensitivity, especially when wavelength dispersion is small or large.
Innovation Solution
An optical communication system that dynamically adjusts the gain of analog amplifiers based on wavelength dispersion estimates, using a comparator and reference generation circuit to set optimal reference values for ADC input amplitude, ensuring the amplitude remains within the ADC's dynamic range and optimizing reception sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the dynamic range is reduced when wavelength dispersion is small, then the analog/digital conversion resolution is maintained, but the reception sensitivity is not improved
Solution Approach 1:
The patent applies dynamics by making the dynamic range of the ADC adjustable rather than fixed. The system dynamically changes the dynamic range based on the detected wavelength dispersion amount. When wavelength dispersion is small, the dynamic range is increased to improve reception sensitivity. When wavelength dispersion is large, the dynamic range is reduced to prevent waveform collapse and expansion. This dynamic adjustment resolves the contradiction between maintaining conversion resolution and improving reception sensitivity under different dispersion conditions.
Solution Approach 2:
The patent changes the parameter of dynamic range based on the wavelength dispersion amount. By detecting the wavelength dispersion and accordingly adjusting the dynamic range parameter of the ADC, the system optimizes both the analog/digital conversion resolution and reception sensitivity. This parameter change approach allows the system to adapt to varying transmission conditions and resolve the technical contradiction.
2Reliability
If the dynamic range is increased to improve reception sensitivity, then sensitivity is enhanced, but the ADC may exceed its dynamic range when wavelength dispersion is large
Solution Approach 1:
The patent implements feedback by detecting the wavelength dispersion amount and using this information to control the dynamic range of the ADC. The system continuously monitors the transmission conditions and adjusts the dynamic range accordingly. This feedback mechanism prevents the ADC from exceeding its dynamic range when wavelength dispersion is large, thereby avoiding waveform collapse and expansion while maintaining optimal reception sensitivity when dispersion is small.
Solution Approach 2:
The patent applies preliminary anti-action by proactively adjusting the dynamic range before waveform collapse or expansion occurs. By detecting the wavelength dispersion amount in advance and setting the appropriate dynamic range, the system prevents the harmful effects of waveform degradation before they occur, rather than attempting to correct them after the fact.
3Ease of operation
If a fixed dynamic range is used for ADC, then the system is simple to operate, but reception sensitivity cannot be optimized for varying wavelength dispersion
Solution Approach 1:
The patent applies self-service by enabling the system to automatically adjust its own dynamic range based on detected wavelength dispersion conditions. The optical receiver autonomously monitors the transmission characteristics and configures the ADC dynamic range without requiring external intervention or complex manual operation. This self-adjusting capability maintains ease of operation while optimizing reception sensitivity for varying dispersion conditions.
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 optimally adjusts the analog signal amplitude for the ADC, enhancing reception sensitivity by matching the amplitude to the wavelength dispersion conditions, thereby preventing sensitivity reduction and maintaining signal quality across varying dispersion levels.
Implementation Method 1
a photoelectric conversion unit to which the optical signal is input and which converts the optical signal into an electric signal
Data Source
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AI summary
Present invention provides an optical communication system that controls reception sensitivity of an optical receiver. The communication system(100) according to the present invention comprising: an optical transmitter(1) to which an transmission signal is input, and which modulates the transmission signal to an optical signal and transmits the optical signal; and an optical receiver(2) that receives the optical signal and demodulates the optical signal to an transmission signal. And the optical receiver(2) includes a photoelectric conversion means(10) for converting the optical signal into an analog electric signal, a conversion and demodulation means(25) for converting the analog electric signal into a digital signal and demodulating the signal to the transmission signal, and an amplitude control means(102) for controlling amplitude of the analog electric signal, and the amplitude control means(102) controls the amplitude of the analog electric signal in accordance with wavelength dispersion of the optical signal.