Silicon Photonics Multicarrier Transceiver for High Data Rate Optical Links
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Solution Overview
Problem
Current optical communications systems face challenges in achieving high data rates without requiring higher speed analog-to-digital converters (ADCs) or digital-to-analog converters (DACs) and suffer from poor spectral efficiency due to limited wavelength stability and narrow-band channels.
Innovation Solution
A silicon photonics multicarrier coherent transceiver is integrated onto a single silicon substrate, using a single laser and on-chip modulators to generate multiple carriers, with off-chip amplifiers for power boosting and basis formers to create orthogonal sets of carriers, reducing the need for high-speed converters and improving spectral efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher speed ADCs and DACs are used to achieve higher data rates, then data rate is improved, but device complexity and cost increase
Solution Approach 1:
The patent segments the high data rate transmission into multiple parallel lower-rate channels using multicarrier modulation. Instead of requiring a single high-speed ADC/DAC, the system divides the data stream across multiple carriers (e.g., OFDM subcarriers), each processed at lower speeds, thereby achieving high aggregate data rates without high-speed converters
Solution Approach 2:
The patent changes the modulation parameters by using advanced modulation schemes (e.g., high-order QAM) and coherent detection to increase the information capacity per symbol. This allows higher data rates to be achieved through parameter optimization rather than increasing converter speed
2Device complexity
If narrow-band channels are used in existing systems, then device complexity is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent transitions from single-carrier narrow-band channels to multicarrier wide-band channels, effectively adding a frequency dimension to the transmission. By utilizing multiple carriers across a broader spectrum, the system achieves higher spectral efficiency while maintaining manageable device complexity through standardized channel processing
3Device complexity
If limited wavelength stability is used in conventional systems, then device complexity is reduced, but spectral efficiency deteriorates
Solution Approach 1:
The patent replaces mechanical/wavelength-stabilization systems with electronic/digital compensation methods. Coherent detection and digital signal processing algorithms compensate for wavelength drift and phase noise, eliminating the need for complex wavelength stabilization mechanisms while enabling high spectral efficiency
Data Source
AI summary
Disclosed herein are techniques, methods, structures and apparatus that provide a silicon photonics multicarrier optical transceiver wherein both the transmitter and receiver are integrated on a single silicon chip and which generates a plurality of carriers through the effect of an on-chip modulator, amplifies the optical power of the carriers through the effect of an off-chip amplifier, and generates M orthogonal sets of carriers through the effect of an on-chip basis former.