Monolithic Optical Transceiver With Three Grating Couplers
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Solution Overview
Problem
Conventional optical communications systems employing transceivers are physically large, expensive, and have many optical interconnects, making them costly and inefficient.
Innovation Solution
A monolithic, phase- and polarization-diversity coherent transceiver photonic integrated circuit with three grating couplers, reducing the number of optical I/O ports and using a single laser for both transmitter and local oscillator, thereby minimizing size, cost, and optical interconnections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional optical transceivers are used, then optical communication function is achieved, but device size and cost increase
Solution Approach 1:
The patent merges the transmitter and receiver functions into a single integrated photonic device on one substrate. The transceiver includes a modulator and a coherent receiver integrated on the same substrate, eliminating the need for separate transmitter and receiver components. This consolidation directly reduces the device footprint while maintaining full optical communication functionality.
Solution Approach 2:
The patent employs a single laser source that serves dual purposes: as the local oscillator for the receiver and as the pump laser for the modulator. This multi-functional use of the laser source eliminates the need for separate laser sources for transmission and reception, further reducing component count and device area.
2Reliability
If conventional optical transceivers are used, then optical communication function is achieved, but manufacturing cost increases
Solution Approach 1:
By integrating multiple functions (modulator, coherent receiver, local oscillator, and pump laser) into a single photonic integrated circuit on one substrate, the patent reduces the number of discrete components that need to be manufactured, assembled, and tested separately. This integration simplifies the manufacturing process and reduces assembly costs.
Solution Approach 2:
The single laser source performing multiple functions (local oscillator and pump laser) reduces the bill of materials and eliminates the need for precise alignment and coupling between separate laser sources, thereby reducing manufacturing complexity and cost.
3Reliability
If multiple optical interconnects are used, then signal transmission is achieved, but device complexity and cost increase
Solution Approach 1:
The integration of the modulator and coherent receiver on the same substrate eliminates the need for external optical interconnects between separate transmitter and receiver modules. The optical signals are coupled directly between integrated components through on-chip waveguides, significantly reducing the number of optical interconnects and associated alignment requirements.
4Reliability
If separate laser sources are used for transmitter and local oscillator, then signal quality is maintained, but device size and cost increase
Solution Approach 1:
The patent uses a single laser source that functions as both the local oscillator for the coherent receiver and the pump laser for the modulator. This is achieved by directing portions of the laser output to different functional blocks on the integrated circuit. This approach maintains signal quality while reducing the device footprint by eliminating redundant laser sources.
Data Source
AI summary
An optical coherent transceiver comprising a polarization and phase-diversity coherent receiver and a polarization and phase-diversity modulator on the same substrate interfaced by three grating couplers, one grating coupler coupling in a signal, one grating coupler coupling in a laser signal, and a third grating coupler coupling out a modulated signal.