Electro-Optic Modulation Chip for Fast Tunable Laser Wavelength Control
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Solution Overview
Problem
Tunable lasers based on current control technology face challenges in achieving increased modulation speed and improved operating performance, particularly in terms of nanosecond-level tuning speed and wide tuning bandwidth while maintaining high output power.
Innovation Solution
An optical modulation chip incorporating an electro-optic phase modulation module and a passband module, which utilizes the electro-optic effect to modulate the wavelength of laser light, enabling higher modulation speed and improved performance by selectively amplifying and filtering target wavelength modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If current control technology is used for wavelength tuning, then nanosecond-level tuning speed and wide tuning bandwidth are achieved, but output power is reduced
Solution Approach 1:
The invention divides the laser cavity into multiple sections with independent current control, allowing different regions to be optimized for different functions (tuning vs. power generation), thus resolving the contradiction between fast tuning speed and high output power
Solution Approach 2:
The patent implements dynamic current control where injection currents can be independently adjusted in different cavity sections, enabling real-time optimization of both tuning speed and output power based on operational requirements
2Device complexity
If temperature control technology is used to change refractive index, then technology simplicity is improved, but modulation speed is reduced and tunable bandwidth is narrowed
Solution Approach 1:
The invention replaces temperature control (thermal field) with current control (electrical field) for wavelength tuning, achieving faster response speeds while maintaining manageable system complexity through electronic control mechanisms
Solution Approach 2:
The patent changes the control parameter from temperature to injection current, fundamentally altering the tuning mechanism to achieve nanosecond-level speed while keeping the system relatively simple through standard laser diode control interfaces
3Power
If mechanical control technology based on MEMS is used, then tunable bandwidth and output power are improved, but device complexity and size increase
Solution Approach 1:
The invention replaces mechanical MEMS control with electrical current control, maintaining high output power and wide tuning bandwidth while dramatically reducing device complexity and eliminating moving parts
Solution Approach 2:
The patent changes from mechanical displacement control to electrical current control, achieving the same functional outcomes (wavelength tuning, power control) through electrical parameters that are easier to manage and integrate
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
The solution significantly enhances the modulation speed and operating performance of tunable lasers by leveraging the electro-optic phase modulation module and passband module to achieve efficient wavelength modulation and amplification, overcoming limitations of existing technologies.
Implementation Method 1
an electro-optic phase modulation module configured to modulate a wavelength of laser light input based on an electro-optic effect
Data Source
AI summary
An optical modulation chip and a tunable laser are provided. The optical modulation chip includes: an electro-optic phase modulation circuit configured to modulate a wavelength of laser light input based on an electro-optic effect and a target wavelength mode; and a passband circuit configured to receive laser light output by the electro-optic phase modulation circuit, reflect and output at least a portion of laser light of the target wavelength mode of laser light input, and dissipate laser light outside the target wavelength mode of the laser light input.