GCSEL Optical Source for Coherent Transceivers
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Solution Overview
Problem
Current coherent optical communication systems are limited by high cost, power consumption, and complexity, particularly due to the need for two distinct optical sources which introduce noise and fail to achieve coherence, and face challenges in optical-carrier phase tracking and PMD removal.
Innovation Solution
A single optical source with dual functionality is used, bifurcating the optical signal to both transmitter and receiver circuits via a photonic integrated circuitry and silicon interposer, eliminating the need for a secondary source and addressing issues like asymmetric loss and phase shift, using a grating-coupled surface-emitting laser (GCSEL) or vertical-cavity surface-emitting laser (VCSEL) with quantum dots for stable emission across a wide temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two distinct optical sources are used in coherent optical communication systems, then the system can provide optical signals for both transmitter and receiver, but the system complexity and cost increase, power consumption increases, and noise is introduced that prevents achieving coherence
Solution Approach 1:
The patent merges the function of two distinct optical sources into a single optical source that simultaneously provides optical signals for both the transmitter and receiver. This single source eliminates the coherence issues introduced by multiple sources while reducing system complexity and power consumption, directly resolving the technical contradiction between achieving coherence and reducing system complexity.
Solution Approach 2:
The single optical source is designed with multi-functionality, serving dual purposes as both the transmitter optical source and the receiver local oscillator source. This universal approach allows one component to fulfill multiple roles in the coherent optical communication system, thereby reducing overall system complexity while maintaining the coherence required for high-speed communication.
2Reliability
If two distinct optical sources are used, then optical signals can be provided for transmitter and receiver, but power consumption increases
Solution Approach 1:
By combining the functions of two separate optical sources into one, the patent reduces the total power consumption of the system. The single optical source consumes less power than two independent sources would require, while still providing the necessary optical signals for both transmission and reception, thus resolving the contradiction between maintaining coherence and reducing power consumption.
3Reliability
If two distinct optical sources are used, then optical signals can be provided for transmitter and receiver, but noise is introduced that fails to achieve coherence
Solution Approach 1:
The patent eliminates noise by merging the functions of two distinct optical sources into one. A single optical source inherently reduces the noise introduced by multiple independent sources, as there are no relative phase fluctuations or frequency offsets between separate sources. This directly resolves the technical contradiction by removing the harmful noise factor while maintaining coherence.
4Device complexity
If a single optical source is used for both transmitter and receiver, then system complexity and power consumption are reduced, but optical-carrier phase tracking and PMD removal challenges remain
Solution Approach 1:
The patent incorporates feedback mechanisms that monitor and adjust the optical carrier phase in real-time. By using feedback from the received signal to correct phase deviations and compensate for polarization mode dispersion, the system maintains coherence and achieves accurate phase tracking despite using a single optical source, thus resolving the contradiction between reduced complexity and phase tracking difficulty.
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 solution reduces costs, power consumption, and complexity while ensuring coherence and stability, enabling higher bit-rates and spectral efficiency by using a single optical source for both transmitter and receiver, thereby enhancing optical power efficiency and simplifying photonic line systems.
Implementation Method 1
using a grating-coupled surface-emitting laser (GCSEL) or vertical-cavity surface-emitting laser (VCSEL) with quantum dots for stable emission across a wide temperature range
Data Source
AI summary
Improved systems and methods are provided to implement coherent communication. The system includes an interposer to route the components of an integrated photonic circuit. The interposer provides an interface to couple the components of the integrated photonic circuit including an optical source, modulator, coherent transmitter, coherent receiver, and interconnects therebetween. The optical source can be a grating-coupled surface-emitting laser (GCSEL). The GCSEL splits an optical signal into two symmetrical optical signals that are directed by a waveguide to a coherent transmitter and/or a coherent receiver of the integrated photonic circuit. Coherent communication is maintained and the need for a second laser in the coherent receiver is avoided through the structure of the GCSEL granting dual functional to the optical source.