Tunable Booster Fiber Ring Laser for L-Band Stability
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Solution Overview
Problem
Conventional tunable fiber lasers face issues with stability, accuracy, and environmental sensitivity due to misalignment and extraneous modes, failing to provide consistent output power and frequency across a broad range of wavelengths.
Innovation Solution
A continuously tunable fiber optic ring laser is designed using a semiconductor booster optical amplifier (BOA) as a gain medium, a Fiber Fabry Perot Tunable Filter (FFP-TF) for wavelength selection, an optical isolator for unidirectional operation, and a polarization controller to achieve stable output power and wavelength, forming a ring configuration that operates in the L and extended L bands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional mechanical or temperature tuning is used to change cavity length, then wavelength can be tuned, but output power and frequency stability deteriorate
Solution Approach 1:
The patent replaces mechanical cavity length tuning with electronic wavelength selection using a Fabry-Perot tunable filter. The filter is controlled by applying different voltages to tune the wavelength, eliminating mechanical movements and contactless alignment issues. This substitution maintains wavelength tunability while significantly improving output power and frequency stability.
Solution Approach 2:
The patent changes the control parameter from mechanical displacement or temperature to electrical voltage. By applying different voltages to the Fabry-Perot filter, the wavelength is tuned electronically without affecting the cavity's mechanical stability. This parameter change enables precise wavelength control while maintaining stable output characteristics.
2Adaptability or versatility
If conventional tunable fiber lasers are used, then wavelength can be adjusted, but environmental sensitivity and misalignment increase
Solution Approach 1:
The patent replaces mechanical alignment components with an all-fiber integrated design featuring a Fabry-Perot filter. This eliminates sensitive mechanical joints and alignment-critical components that are prone to environmental degradation. The wavelength tuning is achieved through voltage control of the filter rather than mechanical adjustment, making the system immune to temperature-induced misalignment and vibration.
Solution Approach 2:
The patent employs an integrated fiber-optic design where the Fabry-Perot filter is nested within the laser cavity structure. This compact nested configuration minimizes the exposure of sensitive components to the external environment, reducing environmental sensitivity while maintaining full wavelength adjustability through electrical control.
3Adaptability or versatility
If conventional tunable fiber lasers are used, then wavelength can be tuned, but extraneous modes and side mode suppression deteriorate
Solution Approach 1:
The patent replaces mechanical wavelength selection methods with an electronically controlled Fabry-Perot filter that provides precise wavelength selection. The filter's high finesse and electronic control enable sharp wavelength selection, suppressing extraneous modes and side modes effectively. This electronic approach provides superior mode suppression compared to mechanical tuning methods.
Solution Approach 2:
The patent incorporates a feedback mechanism where the laser output is monitored and fed back through the Fabry-Perot filter to maintain single-mode operation. This feedback ensures that only the desired wavelength is amplified, automatically suppressing extraneous modes and maintaining high side mode suppression ratio across the tuning range.
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 provides a stable and highly tunable laser output with a side mode suppression ratio (SMSR) of approximately 55 dB and output power fluctuations within 0.2 dB, covering a 54 nm range from 1578 to 1632 nm, enhancing stability and accuracy compared to conventional systems.
Implementation Method 1
a semiconductor booster optical amplifier (BOA), as a gain medium
Implementation Method 2
a Fiber Fabry Perot Tunable Filter (FFP-TF), as a wavelength selection element
Implementation Method 3
an optical isolator (ISO) to insure unidirectional operation of the fiber optic ring laser
Implementation Method 4
a polarization controller (PC) for attaining an optimized polarization state in order to achieve a stable-generated output
Data Source
AI summary
A fiber optic ring laser, and non-transitory computer readable medium for using a fiber optic ring laser are disclosed. The disclosed fiber optic ring laser includes a semiconductor booster optical amplifier (BOA), as a gain medium; a Fiber Fabry Perot Tunable Filter (FFP-TF), as a wavelength selection element; an optical isolator (ISO) to insure unidirectional operation of the fiber optic ring laser; and a polarization controller (PC) for attaining an optimized polarization state in order to achieve a stable-generated output in terms of output power and wavelength, wherein the BOA, the FFP-TF, the ISO and the PC are coupled to form a ring configuration that implements a continuously tunable booster amplifier-based fiber ring laser.