Optical Mixer Loss Compensation for Extinction Ratio
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical mixers in optical communication systems face challenges in compensating for loss when waveguides intersect, leading to degradation of the extinction ratio, which cannot be effectively addressed by existing techniques that only compensate for differences in optical path lengths.
Innovation Solution
The optical mixer incorporates loss compensating means on waveguides that intersect, ensuring equal loss compensation across all intersecting waveguides, thereby maintaining a high extinction ratio by adjusting waveguide lengths and incorporating loss compensation mechanisms at specific intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If waveguides are configured to intersect to achieve compact layout, then device area is reduced, but intersection loss occurs causing extinction ratio degradation
Solution Approach 1:
The patent introduces a loss compensating means as an intermediary element at the waveguide intersection point. This compensating means acts as a mediator that counteracts the intersection loss, allowing the waveguides to maintain equal effective loss despite the physical intersection. The compensating means enables the compact intersecting layout while preserving the extinction ratio by compensating for the energy loss at the intersection point.
2Reliability
If loss compensating means is added to intersecting waveguides, then extinction ratio is maintained, but device complexity increases
Solution Approach 1:
The loss compensating means is applied locally only at the specific waveguide intersection points where loss occurs, rather than throughout the entire waveguide structure. This localized approach maintains the extinction ratio by addressing the problem precisely where it arises, while minimizing the overall device complexity by avoiding unnecessary compensation mechanisms in non-intersecting regions.
3Reliability
If waveguide arm lengths are equalized to maintain extinction ratio, then signal balance is improved, but adaptability to different path requirements is reduced
Solution Approach 1:
The patent changes the parameter being controlled from physical waveguide length to effective loss. By introducing loss compensating means, the system can maintain equal effective loss (and thus equal extinction ratio) even when the physical path lengths of the waveguides differ. This allows the interferometer to adapt to different path length requirements while preserving signal balance through loss compensation rather than strict length equalization.
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 configuration allows for high-quality DP-QPSK demodulation processing by compensating for intersection losses, ensuring a high extinction ratio and maintaining signal integrity in optical communication systems.
Implementation Method 1
a first optical coupler that receives signal light, branches the signal light and outputs first and second signal light
Data Source
AI summary
When a waveguide of second signal light outputted from a first optical coupler intersects a waveguide of first local light outputted from a second optical coupler, a waveguide of a first signal light outputted from the first optical coupler and a waveguide of a second local light outputted from the second optical coupler are each provided with a loss compensation intersecting waveguide that compensates for loss that occurs when the waveguide of the second signal light outputted from the first optical coupler intersects the waveguide of the first local light outputted from the second optical coupler.