Direct-Coupling AWG Device for Optical Transceiver Loss Reduction
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Solution Overview
Problem
Optical transceivers face challenges in scaling down while maintaining performance due to issues like insertion loss, thermal management, and manufacturing yield, particularly in reducing fiber use and minimizing insertion loss for higher channel density.
Innovation Solution
A direct-coupling arrayed waveguide grating (AWG) device is used, eliminating the need for intermediate fibers by directly coupling output channels to detector devices, formed using planar lightwave circuit (PLC) techniques with a tapered output interface to enhance light reflection and reduce insertion loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If intermediate fibers are used to couple AWG outputs to detectors, then alignment flexibility is improved, but insertion loss increases and device compactness deteriorates
Solution Approach 1:
The patent merges the AWG device and detector array into a single integrated package with direct optical coupling. The AWG output waveguides are directly coupled to the detector array without intermediate fibers, eliminating connection interfaces and reducing insertion loss while maintaining alignment flexibility through integrated design.
Solution Approach 2:
The patent extracts and eliminates the intermediate fiber components from the optical coupling path. By removing these unnecessary intermediate elements, the system achieves direct coupling between AWG outputs and detectors, reducing insertion loss and improving device compactness.
2Ease of operation
If intermediate fibers are used to couple AWG outputs to detectors, then alignment flexibility is improved, but device compactness deteriorates
Solution Approach 1:
The patent merges the AWG device and detector array into a single integrated package with direct optical coupling. This integration eliminates the space required for intermediate fibers and their connectors, significantly improving device compactness while maintaining alignment flexibility through the integrated design.
Solution Approach 2:
The patent extracts and eliminates the intermediate fiber components from the optical coupling path. By removing these unnecessary intermediate elements, the system achieves direct coupling between AWG outputs and detectors, reducing device volume and improving compactness.
3Productivity
If channel density is increased in optical transceivers, then transmission capacity is improved, but maintaining performance becomes more difficult due to insertion loss and thermal management
Solution Approach 1:
The patent merges multiple optical channels into a single integrated AWG device with direct coupling to a multi-element detector array. This integration reduces the cumulative insertion loss that would otherwise accumulate across multiple fiber connections, enabling higher channel density while maintaining reliable performance.
Solution Approach 2:
The patent extracts and eliminates intermediate fiber components that contribute to insertion loss. By achieving direct coupling, the system reduces total insertion loss and improves optical efficiency, enabling higher channel density while maintaining transceiver performance reliability.
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 overall insertion loss by 1 to 2 dB, improving the sensitivity and performance of receiver optical subassemblies (ROSAs) and allowing for more compact designs in small form-factor configurations.
Implementation Method 1
an array of waveguides, with each of the array of waveguides having a different length, configured to receive light corresponding to an associated channel wavelength launched from the planar lightwave circuit
Implementation Method 2
arrayed waveguide grating (AWG) device
Implementation Method 3
a tapered region disposed at a second end of the AWG chip configured to receive light via the plurality of output waveguides and reflect the light towards an output interface region of the AWG chip
Implementation Method 4
directly coupling the output channels to a detector array
Data Source
AI summary
An arrayed waveguide grating (AWG) device for use in an optical transceiver is disclosed, and can de-multiplex an optical signal into N number of channel wavelengths. The AWG device can include an AWG chip, with the AWG chip providing a planar lightwave (PLC) circuit configured to de-multiplex channel wavelengths and launch the same into output waveguides. A region of the AWG chip may be tapered such that light traveling via the output waveguides encounters an angled surface of the tapered region and reflects towards an output interface region of the AWG chip. Thus detector devices may optically couple to the output interface region of the AWG chip directly, and can avoid losses introduced by other approaches which couple an output of an AWG to detectors by way of a fiber array or other intermediate device.