Slow Waveguide Band Gap and Loss Optimization
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Solution Overview
Problem
Existing slow wave guides for optical signals face challenges with significant transmission losses at certain operating points and a narrow photonic band gap, limiting their efficiency in slowing down optical signals while maintaining low losses.
Innovation Solution
The proposed slow wave guide design incorporates overlapping widening and narrowing regions along with the initial and final regions, which widens the photonic band gap and maintains or reduces transmission losses, allowing for improved optical signal slowdown with reduced oscillations in transmission losses as a function of wavelength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If known slow wave guide designs are used to slow down optical signals, then optical signal slowdown is achieved, but transmission losses become significant at certain operating points
Solution Approach 1:
The slow wave guide is divided into multiple functional sections: a first section with a first period for strong slowdown, a second section with a second period for transition, and a third section with a third period for maintaining low losses. This segmentation allows each section to be optimized for its specific function, resolving the contradiction between slowdown and transmission losses by distributing these functions across different spatial zones rather than requiring the entire structure to simultaneously achieve both goals.
2Speed
If known slow wave guide designs are used to achieve strong optical signal slowdown, then the photonic band gap remains narrow
Solution Approach 1:
Different sections of the slow wave guide are assigned different local qualities through varying the period values. The first section uses a first period optimized for strong slowdown, the second section uses a second period for adiabatic transition, and the third section uses a third period for maintaining low losses and wide band gap. This local quality variation allows the structure to achieve both strong slowdown capability and wide photonic band gap by optimizing each local region for its specific function rather than using a uniform structure.
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 design achieves better optical signal slowdown with lower transmission losses and a wider photonic band gap, providing improved performance by maintaining identical transmission losses to known slow wave guides while enhancing signal slowdown, and reducing oscillations in transmission losses near the photonic band gap.
Implementation Method 1
the slowing down section being arranged to slow down the propagation of the optical signal... the photonic band gap is wider than in the absence of the initial and final regions
Data Source
Figure 1~4
Figure 5~8
Figure 9~12
AI summary
This slow-wave waveguide comprises: - an initial region (28) extending along an optical axis (10) from a starting point (33) where the width of a central waveguide (12) begins to decrease continuously to an end point (34) beyond which the width of the central waveguide no longer decreases until the end of a slowing section (18), this initial region overlapping a widening region (56) where the length of lateral teeth (40) increases continuously; - a final region (32) extending along the optical axis from a starting point (36) where the width of the central waveguide begins to increase continuously to an end point (37) beyond which the width of the central waveguide no longer increases, this final region overlapping a narrowing region (60) where the length of lateral teeth (40) decreases continuously.