Plastic Waveguide PAM4 Link With PI-Based Carrier Synchronization
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Solution Overview
Problem
Conventional high-speed interconnects face challenges due to bandwidth limitations in copper-based electrical links and high equipment costs for optical links, while plastic waveguide links offer low loss and wideband characteristics but are limited by single waveguide transmission and carrier synchronization requirements.
Innovation Solution
A 50 GB/S PAM4 bi-directional plastic waveguide link is developed, utilizing a PI-based Costas loop for carrier synchronization, which includes a phase detector, loop filter, and phase adjuster to synchronize the clock signal and enhance phase adjustment capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If copper-based electrical links are used for high-speed interconnects, then electrical signal transmission is achieved, but bandwidth limitation occurs due to skin loss
Solution Approach 1:
The patent replaces copper-based electrical transmission with plastic waveguide-based optical transmission. This substitution eliminates skin loss effects inherent in electrical conductors and enables wider bandwidth operation through the waveguide structure, directly resolving the bandwidth limitation caused by skin loss in copper links.
2Speed
If optical links are used for high-speed interconnects, then bandwidth is improved, but equipment costs increase due to E/O and O/E conversion devices and chip-to-fiber assembly
Solution Approach 1:
The patent extracts and eliminates the complex E/O and O/E conversion devices from the system by implementing direct optical transmission through plastic waveguides. This removal of unnecessary conversion components significantly reduces equipment costs and device complexity while maintaining high bandwidth performance.
Solution Approach 2:
The patent employs cost-effective plastic waveguide materials instead of expensive traditional optical components. The plastic waveguide structure provides a economical solution that achieves high-speed transmission without requiring costly E/O and O/E conversion devices, directly addressing the equipment cost issue.
3Loss of energy
If plastic waveguide links are used, then low loss and wideband characteristics are achieved, but single waveguide transmission is limited due to low confinement
Solution Approach 1:
The patent segments the single waveguide into multiple waveguides within the same physical structure. By creating multi-waveguide configurations, the system overcomes the single waveguide transmission limitation while maintaining the low loss characteristics of plastic waveguides and increasing overall transmission capacity.
4Speed
If plastic waveguide links are used, then wideband channel characteristic is achieved, but carrier synchronization is limited requiring external local oscillator phase tuning
Solution Approach 1:
The patent implements self-service carrier synchronization through integrated phase detection and adjustment circuits within the receiver. This self-synchronizing mechanism eliminates the need for external local oscillator phase tuning, reducing device complexity while maintaining wideband operation capabilities.
Data Source
AI summary
According to the present disclosure, an RF communication system using a bi-directional plastic waveguide link is suggested. The system may comprise: an RF transmitter configured to up-convert a transmission signal to a carrier frequency, and transmit same; an RF receiver configured to down-convert a reception signal received on the carrier frequency, and receive same; a bi-directional plastic waveguide device configured to provide a channel for transmission of the transmission signal and a channel for reception of the reception signal; and a microstrip-to-waveguide transition (MWT) configured to transfer a signal between the RF transmitter or the RF receiver and the bi-directional plastic waveguide device. The RF receiver may comprise: a phase detector configured to detect the phase of the down-converted reception signal by using a clock signal; and a phase synchronization device configured to regulate the phase of the clock signal on the basis of the detected phase. Through such configuration, the present disclosure may suggest a 50 GB/S PAM4 bi-directional plastic waveguide link having carrier synchronization using a PI-based Costas loop, which can exhibit very excellent performance from the perspective of a throughput-distance and energy efficiency, compared to conventional technology.