Optical Transmitter Feedback Control for Power Stability
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical transmitters face challenges in maintaining constant power dissipation and output voltage amplitude across varying temperatures, leading to increased power consumption and reduced efficiency due to temperature-dependent voltage gain degradation.
Innovation Solution
An optical transmitter system that includes a signal processor, driver, current detector, amplitude detector, and controller, which adjusts the supply current and modulation signal amplitude to maintain a constant power dissipation and output voltage amplitude by controlling the voltage gain and supply current based on detected values, using a feedback loop to compensate for temperature fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the driver amplifies the modulation signal to maintain output voltage amplitude, then the transmission quality is improved, but the power dissipation increases due to temperature-dependent voltage gain degradation
Solution Approach 1:
The patent implements a feedback control mechanism where the detection circuit continuously monitors the output voltage amplitude and supply current of the driver. The control circuit receives these detection signals and adjusts the drive signal to the variable gain amplifier to maintain constant output voltage amplitude while compensating for temperature-induced voltage gain degradation, thereby preventing excessive power dissipation.
Solution Approach 2:
The patent changes the operating parameters of the driver by dynamically adjusting the supply current based on detected temperature variations and output voltage amplitude. The control circuit modifies the drive signal parameters to the variable gain amplifier, enabling the system to adapt to temperature changes and maintain optimal performance without excessive power consumption.
2Reliability
If the supply current is increased to compensate for voltage gain degradation, then the output voltage amplitude is maintained, but the power dissipation increases
Solution Approach 1:
The detection circuit monitors both the output voltage amplitude and supply current in real-time. The control circuit uses this feedback information to precisely adjust the drive signal to the variable gain amplifier, ensuring that supply current is only increased to the extent necessary to maintain output voltage amplitude, rather than using a fixed high current setting that would waste energy.
Solution Approach 2:
The system transitions from a static supply current setting to a dynamic adjustment mechanism. The supply current to the variable gain amplifier is continuously adapted based on detected temperature changes and output voltage amplitude, allowing the system to use minimal necessary current under varying conditions rather than operating at a constant high current level.
3Device complexity
If the driver operates without temperature compensation, then the device complexity is reduced, but the power dissipation varies uncontrollably with temperature
Solution Approach 1:
The patent introduces a feedback control system where detection circuits monitor output voltage amplitude and supply current, and the control circuit adjusts the drive signal to the variable gain amplifier based on these detections. This feedback mechanism provides temperature compensation with relatively simple additional circuitry compared to the benefits of stable power dissipation.
Solution Approach 2:
The system performs self-compensation for temperature effects through automatic detection and control. The detection circuit identifies temperature-induced voltage gain degradation, and the control circuit automatically adjusts the drive signal to maintain stable operation, eliminating the need for complex external temperature compensation mechanisms.
Data Source
AI summary
An optical transmitter including a signal processor, a driver, a current detector, an amplitude detector, and a controller is disclosed. The signal processor outputs a modulation signal that has first amplitude. The driver amplifies the modulation signal for generating a driving signal that has second amplitude. The current detector detects a supply current that the driver consumes for the amplification. The amplitude detector detects the second amplitude of the driving signal. The controller keeps the driver based at least in part on the supply current detected by the current detector for maintaining the supply current of the driver in a first target value. The controller varies the first amplitude of the modulation signal based at least in part on the second amplitude of the driving signal detected by the amplitude detector for maintaining the second amplitude of the driving signal in a second target value.