AWG Multiplexing Polarization-Multiplexed Signals
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Solution Overview
Problem
The integration of multiple wavelength division multiplexers on a photonic integrated circuit (PIC) complicates the design and reduces yields in wavelength division multiplexed (WDM) optical communication systems, particularly due to the need for multiple polarization beam combiners.
Innovation Solution
An arrayed waveguide grating (AWG) is used to multiplex optical signals with the same wavelengths but different polarizations, simplifying the design by combining them into a single component, which reduces the number of required multiplexers and combiners.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple WDM combiners are integrated on a PIC to handle polarization-multiplexed signals, then data transmission rate is improved, but device complexity increases and manufacturing yield decreases
Solution Approach 1:
The patent combines two separate WDM combiners into a single WDM combiner by integrating a polarization beam combiner (PBC) with the WDM combiner structure. This merging allows the single combiner to handle both polarization-multiplexed signals and wavelength-division multiplexed signals simultaneously, thereby reducing the total number of combiners from two to one while maintaining high data transmission rates
2Productivity
If multiple WDM combiners are integrated on a PIC to handle polarization-multiplexed signals, then data transmission rate is improved, but manufacturing yield decreases
Solution Approach 1:
The patent merges multiple combiner functions into a single integrated component, reducing the number of separate WDM combiners and PBCs from two to one. This consolidation simplifies the fabrication process, reduces alignment requirements, and minimizes potential failure points, thereby improving manufacturing yield while maintaining the capability to transmit multiple polarization-multiplexed channels at high data rates
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 allows for a simpler PIC design, increasing data transmission rates by eliminating the need for multiple combiners and improving yield, while maintaining efficient signal multiplexing capabilities.
Implementation Method 1
An arrayed waveguide grating (AWG) is used to multiplex optical signals with the same wavelengths but different polarizations
Data Source
AI summary
Consistent with the present disclosure, an arrayed waveguide grating (AWG) is provided that includes first inputs and second inputs. Each of the first inputs receives a corresponding one of a plurality of first optical signals, each of which has a corresponding one of a plurality of wavelengths. Second inputs are also provided, such that each second input is preferably provided between two adjacent first inputs. Each of the second inputs receives a corresponding one of a plurality of second optical signals, and each of the second plurality of optical signals has a corresponding one of those wavelengths. Each of the first plurality of optical signals, however, has a first polarization and each of the second plurality of optical signals has a second polarization different than the first polarization. Since the first optical signals are supplied through AWG inputs that are offset from the inputs that receives second optical signals, the first optical signals are supplied at a first AWG output that is spaced from a second AWG output that supplies the second optical signals. The second optical signals are supplied through the second output even though the second optical signals have the same (or substantially the same) wavelengths as the first optical signals. Accordingly, a single AWG may be provided to multiplex both first and second optical signals, thereby simplifying PIC design.