Deformable Reflector Dispersion Compensator for Slope Tuning
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Solution Overview
Problem
Current tunable chromatic dispersion compensators are inadequate for next-generation optical networks as they cannot effectively compensate the chromatic dispersion slope over a specific wavelength range, particularly in DWDM systems, and are often expensive and non-reconfigurable.
Innovation Solution
A dispersion compensator device featuring a deformable reflector formed by strips of materials with different thermal expansion coefficients, coupled with a thermoelectric unit to adjust the shape and a support member for positioning, allowing for tunable dispersion compensation by varying the focal length of the telescope structure and introducing a temperature gradient along the grating array for slope compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional tunable dispersion compensators (e.g., FBG, etalon based DCMs) are used, then chromatic dispersion can be tuned, but chromatic dispersion slope cannot be compensated
Solution Approach 1:
The dispersive grating is segmented into multiple independently controllable sections along the dispersion direction. Each section can be independently heated or cooled to create localized thermal expansion/contraction, enabling independent control of dispersion and dispersion slope compensation. This segmentation allows the system to simultaneously achieve chromatic dispersion tuning and dispersion slope compensation that conventional single-structure compensators cannot provide.
Solution Approach 2:
The invention changes physical parameters (temperature) of specific grating sections to dynamically adjust optical properties. By controlling the temperature of each grating section, the refractive index and physical dimensions change, thereby tuning both chromatic dispersion and dispersion slope. This parameter change approach enables continuous and independent control of multiple dispersion parameters.
2Reliability
If specially designed optical fibers are used for dispersion compensation, then chromatic dispersion can be compensated, but the device becomes expensive and non-tunable
Solution Approach 1:
The invention transforms a static dispersion compensation structure into a dynamic one by introducing thermal control to the grating sections. The deformable mirror with variable focal length allows real-time adjustment of the optical path, while independent temperature control of grating sections enables dynamic tuning of dispersion characteristics. This dynamic capability replaces expensive fixed fiber solutions with a reconfigurable device.
Solution Approach 2:
The invention replaces mechanical/fiber-based dispersion compensation with a grating-based optical system controlled by thermal and deformable mirror mechanisms. This substitution allows for electronic control of dispersion parameters without requiring physical fiber replacement or complex mechanical adjustments, achieving both cost-effectiveness and tunability.
3Device complexity
If the focal length of the object lens is fixed, then the telescope structure is simple, but the dispersion compensation range is limited
Solution Approach 1:
Instead of changing the focal length of the object lens which would complicate the telescope structure, the invention changes the focal length of the deformable mirror (eye piece) through mechanical deformation control. This allows the telescope magnification to be adjusted while keeping the object lens fixed, thereby expanding the dispersion compensation range without significantly increasing device complexity.
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
Enables tunable dispersion compensation, multi-channel operation, and wide-band slope compensation, making it suitable for dynamically reconfigurable optical networks with improved agility and cost-effectiveness compared to existing solutions.
Implementation Method 1
the second material having an expansion coefficient different than the first material
Implementation Method 2
a dispersive grating disperses the light to a small angle
Data Source
AI summary
In an example embodiment, lightwave device for use in a dispersion compensator, includes a light coupler configured to direct light toward a grating structure. The light coupler includes a first strip including a first material and a second strip attached to the first strip. The second strip includes a second material, and the second material has an expansion coefficient different than the first material. The first and second strips form a deformable reflector. A thermoelectric unit is coupled to the light coupler and is configured to adjust a shape of the deformable reflector based on a temperature of the thermoelectric unit. A support member is connected to the light coupler and is configured to position the deformable reflector so to receive light for transmission to the grating structure. Another embodiment provides a dispersion compensator using the lightwave device.