Optical Transceiver Bias Voltage Control via Temperature Feedback
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Solution Overview
Problem
Existing optical transceivers face difficulties in accurately adjusting the reverse bias voltage of avalanche photodiodes due to changes in power consumption and heat generation during different communication states, making it challenging to maintain optimal performance.
Innovation Solution
An optical transceiver design that includes a temperature sensor, an integrated circuit, and a transmission driver, with a casing that has thermal conductivity, allowing for accurate temperature measurement and adjustment of the bias voltage using linear computation based on detected temperatures and drive rates, ensuring optimal performance across varying communication states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If feedforward control using temperature sensor and lookup table is used, then temperature compensation is achieved, but accurate bias voltage adjustment cannot be maintained when power consumption changes
Solution Approach 1:
The patent introduces feedback control by measuring the actual temperature of the light receiving element and adjusting the bias voltage based on the difference between actual and target values. This closed-loop feedback mechanism ensures accurate bias voltage adjustment even when power consumption changes during different communication states, resolving the contradiction between temperature measurement capability and bias voltage adjustment accuracy.
Solution Approach 2:
The patent pre-calculates and stores target bias voltage values corresponding to different temperature values in advance. When operation, the system quickly retrieves the appropriate target value based on measured temperature and uses it as reference for feedback control. This preliminary preparation enables rapid and accurate bias voltage adjustment without complex real-time calculations.
2Adaptability or versatility
If different operations are performed according to communication state, then communication flexibility is improved, but temperature changes cause inaccurate bias voltage adjustment
Solution Approach 1:
The patent implements dynamic bias voltage adjustment by continuously monitoring temperature and updating the bias voltage based on current operating conditions. The system adapts to different communication states by measuring real-time temperature and adjusting bias voltage dynamically, ensuring optimal performance across varying operational modes while maintaining control accuracy.
Solution Approach 2:
The patent changes the bias voltage parameter in response to temperature variations caused by different communication states. By continuously adjusting this critical parameter based on measured temperature and pre-stored target values, the system maintains reliable operation across diverse communication scenarios despite power consumption changes.
3Power
If transmission driver power consumption is high, then transmission performance is improved, but heat generation causes temperature changes affecting bias voltage
Solution Approach 1:
The patent uses feedback control to compensate for temperature changes caused by high transmission driver power. By continuously measuring the light receiving element temperature and adjusting bias voltage based on the difference from target values, the system maintains accurate bias voltage control even when high power transmission causes significant temperature variations.
Solution Approach 2:
The patent converts the harmful effect of heat generation into useful information by using temperature sensors to measure the temperature rise. This temperature information is then utilized through feedback control to adjust bias voltage accordingly, transforming the previously harmful thermal effect into a controllable parameter that enables precise bias voltage adjustment under high power 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 design enables effective adjustment of the bias voltage, maintaining optimal performance and communication quality by accurately accounting for temperature changes and power consumption variations, even during different operations.
Implementation Method 1
a temperature sensor; an integrated circuit capable of performing a computation process using a temperature detected by the temperature sensor
Implementation Method 2
a casing that has thermal conductivity and accommodates the temperature sensor, the integrated circuit, the optical module, and the transmission driver
Implementation Method 3
an optical module including a light emitting element and a light receiving element
Implementation Method 4
an optical module including a light emitting element and a light receiving element
Data Source
AI summary
An optical communication apparatus according to an embodiment of the present invention includes: a light emitting element; a transmission driver that drives the light emitting element; a light receiving element capable of changing a multiplication factor by a bias voltage; a temperature sensor; a computing unit that calculates a drive rate of the transmission driver; and an adjusting unit that adjusts the bias voltage applied to the light receiving element. The adjusting unit adjusts the bias voltage by linear computation using a plurality of target values of the bias voltage for combinations of a plurality of temperatures and a plurality of drive rates, based on a temperature detected by the temperature sensor and a result of calculation of the drive rate.