PIN Diode Tuned Ring Waveguide Optical Switch
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Solution Overview
Problem
Existing optical switches in multi-core microprocessor systems face challenges in achieving low distortion of high bandwidth signals and robustness against temperature changes, while also requiring efficient hitless tuning across multiple wavelengths without affecting other data wavelengths.
Innovation Solution
A multiple ring waveguide resonant optical cavity structure with a PIN diode integrated into one of the ring waveguides, fabricated using a semiconductor-on-insulator substrate, allowing for independent tuning of each ring waveguide resonant optical cavity to achieve hitless operation by changing the refractive index through free carrier injection and extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical switch structures are used, then fabrication is simpler, but the switch cannot achieve low distortion of high bandwidth signals and robustness against temperature changes
Solution Approach 1:
The optical switch is divided into multiple independent ring waveguide resonant cavities, each capable of independent tuning. This segmentation allows each cavity to be optimized for specific wavelength channels while maintaining overall system robustness against temperature variations through distributed control.
Solution Approach 2:
The patent employs PIN diodes to dynamically change the refractive index of the ring waveguide materials through electrical biasing. This parameter change enables active tuning of resonance wavelengths, allowing the switch to maintain low signal distortion and robust performance across varying temperature conditions by adjusting operational parameters in real-time.
2Adaptability or versatility
If conventional optical switch structures are used, then device structure is simpler, but hitless tuning across multiple wavelengths cannot be achieved
Solution Approach 1:
Multiple ring waveguide resonant cavities are configured with independent PIN diode control, allowing each cavity to be tuned independently to specific wavelength channels. This segmentation enables hitless tuning where one wavelength can be switched without affecting others, as each ring operates as an independently controllable resonator.
Solution Approach 2:
The array of ring waveguide resonant cavities provides multi-functionality by simultaneously handling multiple wavelength channels. Each ring can be assigned to different wavelengths, enabling the single device structure to perform multiple switching functions across the broadband spectrum without interference between channels.
3Adaptability or versatility
If broader bandwidth is achieved, then more wavelengths can be switched, but distortion of high bandwidth signals increases
Solution Approach 1:
The broadband spectrum is divided into multiple discrete wavelength channels, each handled by a dedicated ring waveguide resonant cavity. This segmentation allows each cavity to be optimized for its specific wavelength range, maintaining low distortion within each channel while collectively covering a broad bandwidth across all channels.
Solution Approach 2:
By independently adjusting the refractive index parameters of each ring cavity through PIN diode control, the resonance wavelengths can be precisely tuned to match desired channel frequencies. This parameter adjustment ensures optimal performance and minimal distortion across the entire bandwidth spectrum.
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 broadband optical switch with low distortion and robustness against temperature changes, enabling efficient hitless tuning across multiple wavelengths, with a high ON/OFF ratio and low power consumption, suitable for high-performance on-chip optical networks.
Implementation Method 1
independent tuning of each ring waveguide resonant optical cavity to achieve hitless operation by changing the refractive index through free carrier injection and extraction
Data Source
AI summary
An optical switch structure and a method for fabricating the optical switch structure provide at least two ring waveguides located and formed supported over a substrate. At least one of the at least two ring waveguides includes at least one PIN diode integral with the ring waveguide as a tuning component for an optical switch device that derives from the optical switch structure. The PIN diode includes different doped silicon slab regions internal to and external to the ring waveguide, and an intrinsic region there between that includes the ring waveguide. The method uses two photolithographic process steps, and also preferably a silicon-on-insulator substrate, to provide the ring waveguides formed of a monocrystalline silicon semiconductor material.