Coherent Transceiver Clock Architecture for Programmable Optical Networks
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Solution Overview
Problem
Current communication systems face challenges in efficiently managing low power optical transmission in high-speed optical networks, particularly in accommodating varying baud rates, sampling rates, and clock rates, which affects the compatibility and efficiency of data transmission across different modulation and error correction schemes.
Innovation Solution
A coherent transceiver architecture that supports multiple programmable operating modes, allowing components to operate at different sampling and clock rates, and incorporates advanced signal processing techniques such as spectral shaping, pre-equalization, and carrier recovery to optimize data transmission over optical channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a coherent transceiver architecture supports multiple programmable operating modes with different sampling and clock rates, then adaptability to varying baud rates and modulation schemes is improved, but device complexity increases
Solution Approach 1:
The transceiver employs dynamically reconfigurable clock and timing circuitry that can adapt its operating parameters in real-time. The system includes programmable phase-locked loops (PLLs) and clock generators that can be configured through software to support different baud rates, sampling rates, and clock rates, allowing the hardware to dynamically adjust to various modulation schemes without physical reconfiguration
Solution Approach 2:
The patent implements a universal transceiver architecture where a single device can perform multiple functions by supporting various operating modes. The clock and timing circuitry is designed to provide a single reference clock signal that can be divided and distributed to multiple components at different rates, enabling the same hardware to support QPSK, 16-QAM, 64-QAM, and other modulation schemes through programmable configuration rather than requiring separate dedicated hardware for each mode
2Reliability
If advanced signal processing techniques such as spectral shaping, pre-equalization, and carrier recovery are incorporated, then signal integrity is improved, but device complexity and power consumption increase
Solution Approach 1:
The transceiver implements pre-equalization and spectral shaping as preliminary signal processing steps before transmission. The spectral shaper filter applies pre-compensation for expected channel effects, and the pre-equalizer adjusts the signal spectrum in advance to counteract anticipated attenuation and distortion, reducing the need for complex post-processing at the receiver and simplifying the overall system while maintaining signal integrity
Solution Approach 2:
The system incorporates carrier recovery mechanisms that use feedback from the received signal to continuously adjust and track the carrier frequency and phase. The receiver extracts timing and frequency information from the incoming signal and feeds this back to the local oscillator and sampling clock, enabling automatic adaptation to frequency offsets and phase rotations without requiring complex manual calibration or additional hardware
3Use of energy by moving object
If a single reference clock signal is used to provide multiple modified clock signals at different rates, then power consumption is reduced, but the difficulty of detecting and measuring timing relationships increases
Solution Approach 1:
The patent introduces an intermediary clock and timing circuitry block that acts as a mediator between the single reference clock source and the multiple components requiring different clock rates. This intermediary contains programmable clock dividers and phase shifters that take the single reference clock and generate the required multiple clock signals with precise timing relationships, making the timing relationships measurable and controllable while still benefiting from the power efficiency of a single clock source
Data Source
AI summary
A coherent receiver comprises an ingress signal path having an ingress line-side interface, and an ingress host-side interface. The ingress signal path is configured to receive an analog signal vector at the ingress line-side interface, to demodulate the analog signal vector, and to output a digital data signal Fat the ingress host-side interface. The coherent receiver also comprises clock and timing circuitry configured to receive a single reference clock signal and to provide a plurality of modified ingress path clock signals to different components of the ingress signal path, the plurality of modified ingress path clock signals derived from the single reference clock signal and the plurality of modified ingress path clock signals having different clock rates. The receiver, transmitter, or transceiver can operate in a plurality of programmable operating modes to accommodate different modulation/de-modulation schemes, error correction code schemes, framing/mapping protocols, or other programmable features.