Interleaved Echelle Grating Multiplexer Area Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing photonic integrated circuits face challenges in achieving a compact design while maintaining efficient wavelength multiplexing, as the size of echelle gratings increases with narrower wavelength spacing, leading to higher propagation loss and crosstalk when trying to reduce the footprint.
Innovation Solution
The use of two interleaved echelle gratings, where one receives every other wavelength, reduces the total area occupied by replacing a single large grating with two smaller ones, allowing for a more compact design without significant loss in performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single large echelle grating is used to multiplex narrow wavelength spacing, then wavelength multiplexing efficiency is maintained, but the device area increases and propagation loss increases
Solution Approach 1:
The single large echelle grating is divided into multiple smaller echelle gratings, each handling a subset of wavelengths. This segmentation reduces the area of each individual grating while maintaining the overall wavelength multiplexing capability through parallel processing of multiple wavelength subsets.
2Reliability
If a single large echelle grating is used to multiplex narrow wavelength spacing, then wavelength multiplexing efficiency is maintained, but propagation loss increases
Solution Approach 1:
By segmenting the single large grating into multiple smaller gratings, the optical path length and number of reflections are reduced for each grating element, thereby decreasing propagation loss while maintaining wavelength multiplexing efficiency through the combined operation of all gratings.
3Reliability
If a single large echelle grating is used to multiplex narrow wavelength spacing, then wavelength multiplexing efficiency is maintained, but crosstalk increases
Solution Approach 1:
Segmenting the grating system reduces the angular dispersion and spatial overlap between adjacent wavelengths in each smaller grating, thereby reducing crosstalk. The interleaved wavelength assignment to different gratings further isolates wavelength channels and minimizes harmful interactions.
4Area of stationary object
If the footprint is reduced by using a smaller grating, then device area is reduced, but wavelength spacing becomes too narrow for efficient multiplexing
Solution Approach 1:
Multiple smaller gratings are arranged in parallel, each optimized for a specific wavelength subset with appropriate spacing. This allows each grating to maintain sufficient physical dimensions for efficient multiplexing of its assigned wavelengths while the overall system footprint remains compact due to the distributed architecture.
Solution Approach 2:
The system transitions from a single-dimensional large grating to a two-dimensional array of smaller gratings, utilizing spatial distribution across multiple positions to achieve the same spectral multiplexing function with reduced individual element sizes and reduced overall footprint.
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 approach reduces the overall area required by approximately half while maintaining efficient wavelength multiplexing, allowing for a more compact photonic integrated circuit with reduced propagation loss and crosstalk.
Implementation Method 1
an array of lasers each generating laser light at a different respective wavelength of an array of wavelengths may be connected to one or more wavelength multiplexers, such as echelle gratings
Data Source
AI summary
A system including wavelength multiplexers. In some embodiments, the system includes: a first multiplexing element, having a first plurality of input waveguides, each configured to receive light at a respective wavelength of a first plurality of wavelengths; and a second multiplexing element, having a second plurality of input waveguides, each configured to receive light at a respective wavelength of a second plurality of wavelengths. A wavelength of the second plurality of wavelengths may fall between a first wavelength of the first plurality of wavelengths and a second wavelength of the first plurality of wavelengths.