Optical Transmitter Stabilizer for Multi-Carrier Phase Control
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Solution Overview
Problem
Existing optical transmitters face challenges in maintaining stable operation across varying temperatures while supporting both single carrier and multicarrier modulation schemes, which affects the quality of high-speed optical signal transmission.
Innovation Solution
The optical transmitter employs a Mach-Zehnder interferometer configuration with a phase shifter and an output stabilizer that applies bias dithering signals to maintain optimal operating conditions for the modulators, ensuring stable output by controlling the bias of each component through a feedback loop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an optical IQ modulator is used to support both single carrier and multicarrier schemes, then the transmitter becomes multi-functional, but maintaining stable operation across varying temperatures becomes difficult
Solution Approach 1:
The patent implements a feedback control system that continuously monitors the operating point of the optical IQ modulator and adjusts bias voltages accordingly. Temperature sensors detect environmental changes, and the system automatically compensates by modifying the bias conditions of the modulator to maintain optimal operation across both single carrier and multicarrier modes despite temperature variations.
Solution Approach 2:
The patent dynamically adjusts electrical parameters (bias voltages) of the optical IQ modulator in response to temperature changes. By changing these electrical parameters adaptively, the system maintains stable modulator operation and consistent signal quality across varying thermal conditions while supporting multiple transmission schemes.
2Device complexity
If the phase difference between Inphase and Quadrature components is not maintained at 90 degrees, then the device complexity is reduced, but the quality of modulated optical signal deteriorates
Solution Approach 1:
The patent employs a feedback mechanism that monitors the phase relationship between Inphase and Quadrature components and automatically adjusts the phase shifter control voltage to maintain the critical 90-degree phase difference. This feedback loop ensures high signal modulation quality without requiring complex manual calibration or overly sophisticated hardware design.
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 configuration enables stable and multi-functional optical transmission by maintaining the phase difference between Inphase and Quadrature components at 90 degrees, reducing RF power and maximizing signal amplitude, thus stabilizing the optical signal across different temperature conditions.
Implementation Method 1
an optical modulator, a high-speed signal generator and an output stabilizer. The optical modulator may include a first modulator and a second modulator connected in parallel to each other in the form of a Mach-Zehnder interferometer
Implementation Method 2
a phase shifter connected to the second modulator in series... stabilizing a final output optical signal by controlling a bias of each of the first modulator, the second modulator and the phase shifter
Data Source
AI summary
An optical transmitter including an optical modulator comprising a first modulator and a second modulator connected in parallel to each other in the form of a Mach-Zehnder interferometer, and a phase shifter connected to the second modulator in series, a high-speed generator configured to generate a single carrier signal or multi-carrier signals and apply the generated single carrier signal or multi-carrier signals to the optical modulator, and an output stabilizer configured to stabilize a final output optical signal of the optical modulator by controlling a bias of each of the first modulator, the second modulator and the phase shifter.