Arrayed Waveguide Grating Phase Shifting to Reduce Insertion Loss
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Solution Overview
Problem
Optical communication systems using arrayed waveguide gratings experience high insertion loss in waveguides configured to output optical signals due to the demultiplexing of optical signals with different wavelengths.
Innovation Solution
The arrayed waveguide grating incorporates phase shift structures between waveguides and couplers to adjust the amplitude of optical signals with different wavelengths, optimizing the divergence field distribution and reducing insertion loss by correlating light intensity with the square of the amplitude, and optionally using Powell prisms, metalenses, or liquid crystal lenses to achieve flat-top divergence angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If arrayed waveguide grating is used to demultiplex optical signals with different wavelengths, then wavelength separation capability is improved, but insertion loss of output waveguides increases
Solution Approach 1:
The patent introduces phase shift structures that change the phase parameters of optical signals at specific wavelengths. By adjusting these phase shifts, the patent redirects energy distribution within the waveguide array, ensuring that signals at target wavelengths are coupled into the correct output waveguides while minimizing energy loss. This parameter modification enables high wavelength separation capability while reducing insertion loss through optimized phase control.
2Loss of energy
If phase shift structures are added to adjust optical signal amplitude, then insertion loss is reduced, but device complexity increases
Solution Approach 1:
The patent applies phase shift structures only at specific locations within the waveguide array where they are most effective for redirecting energy. Rather than uniformly modifying all waveguides, the phase shift elements are strategically placed to affect only the critical energy distribution paths. This localized approach reduces the overall device complexity while still achieving significant insertion loss reduction through targeted phase control.
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 effectively reduces insertion loss in waveguides by enhancing light intensity and minimizing energy distribution outside the intended waveguides, thereby improving the efficiency of optical signal demultiplexing and communication capacity.
Implementation Method 1
A first phase shift structure is further disposed between the second waveguide and the second coupler. The first phase shift structure is configured to adjust an amplitude of one or more optical signals with different wavelengths in the second optical signal, to generate a third optical signal
Implementation Method 2
A second phase shift structure is further disposed between the first waveguide and the first coupler. The second phase shift structure is configured to adjust an amplitude of one or more optical signal with wavelengths in the first optical signal, to generate a fifth optical signal
Implementation Method 3
The first coupler is configured to: receive the first optical signal transmitted by the first waveguide, generate k second optical signals based on the first optical signal, and couple one second optical signal into one second waveguide for transmission
Data Source
AI summary
An arrayed waveguide grating includes m first waveguides, a first coupler, k second waveguides, a second coupler, and n third waveguides, where m, n, and k are all positive integers, and lengths of the k second waveguides sequentially increase. The first waveguide is configured to transmit a first optical signal to the first coupler. The first coupler is configured to generate k second optical signals based on the first optical signal. The second waveguide is configured to transmit the second optical signal to a first phase shift structure. The first phase shift structure is configured to adjust an amplitude of one or more optical signals with different wavelengths in the second optical signal to generate a third optical signal. The second coupler is configured to generate n fourth optical signals based on the third optical signal. The third waveguide is configured to output the fourth optical signal.