Silicon Photonics Transceiver Module Using Soliton Frequency Combs
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current pluggable optical modules in data centers are limited by connector density, heat dissipation, and signal integrity, and traditional wavelength division multiplexing technologies cannot meet the increasing bandwidth demands of future high-speed optical switches, particularly for 102.4 T and 204.8 T switches, leading to bottlenecks in bandwidth density and energy efficiency.
Innovation Solution
A silicon-based photonics engine transceiver chip module utilizing a silicon photonic integration technology with indium phosphide (InP)-based lasers and semiconductor optical amplifiers, combined with an ultra-low loss SiN resonator cavity and dense wavelength division multiplexing, to generate a soliton-based optical frequency comb, achieving a 6.4 Tbps transmission rate with reduced power consumption and size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If traditional coarse wavelength division multiplexing technology is used in photonics engines, then the system can be implemented with existing technology, but the transmission rate cannot meet the requirements of future 102.4 T and 204.8 T switches
Solution Approach 1:
The patent transitions from coarse wavelength division multiplexing to dense wavelength division multiplexing, changing the wavelength spacing parameter from 100 GHz to 50 GHz or finer. This parameter change enables the transmission rate to reach 6.4 Tbps, meeting the requirements of future high-speed switches while maintaining system implementability
Solution Approach 2:
The patent employs soliton-based optical frequency comb generation using mode-locked lasers, which produce periodic pulse trains with precise temporal and spectral characteristics. This periodic action enables stable, high-rate data transmission across multiple wavelength channels simultaneously, achieving the required transmission rate
2Productivity
If the number of lasers is increased to achieve higher transmission rates, then the bandwidth capacity increases, but the power consumption and volume of the photonics engine increase
Solution Approach 1:
The patent merges multiple wavelength channels into a single optical fiber using dense wavelength division multiplexing. Instead of using separate lasers and fibers for each channel, multiple wavelength channels are combined and transmitted simultaneously through one fiber, reducing the number of physical components while increasing total bandwidth capacity
Solution Approach 2:
The patent uses a single mode-locked laser to generate an optical frequency comb that provides multiple wavelength channels simultaneously. This multi-functional approach allows one laser source to serve multiple wavelength channels, reducing the total number of lasers needed while maintaining high bandwidth capacity
3Adaptability or versatility
If pluggable optical modules are used for high-speed data exchange, then flexibility and interoperability are improved, but connector density, heat dissipation, and signal integrity become limiting factors
Solution Approach 1:
The patent integrates the photonics engine directly into the switch chip substrate using co-packaging technology, nesting the optical engine within the electronic switching fabric. This eliminates the need for external pluggable modules and their associated connectors, solving heat dissipation and signal integrity issues while maintaining flexibility through direct integration
Solution Approach 2:
The patent replaces mechanical pluggable module connectors with direct optical coupling between the photonics engine and switch chip. This substitution eliminates mechanical connection issues, reduces heat dissipation problems, and improves signal integrity while maintaining system adaptability through software-configurable optical paths
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
The solution enables a high-speed, low-power, and compact photonics engine transceiver chip with a 6.4 Tbps capacity, reducing the number of lasers and power consumption while enhancing integration and miniaturization, thus addressing the limitations of traditional technologies.
Implementation Method 1
soliton-based optical frequency comb generated by an ultra-low loss SiN resonator cavity
Implementation Method 2
ultra-low loss SiN resonator cavity
Implementation Method 3
indium phosphide (InP)-based laser
Implementation Method 4
semiconductor optical amplifier (SOA)
Implementation Method 5
32 silicon photonic carrier-depletion modulators
Implementation Method 6
silicon photonic carrier-depletion modulators
Implementation Method 7
Si—SiN waveguide transition structure
Data Source
AI summary
A 6.4 Tbps silicon-based photonics engine transceiver chip module for high-speed optical communication manufactured based on processing techniques of semiconductors such as silicon-on-insulator (SOI) and indium phosphide (InP). The photonics engine transceiver chip module uses a silicon photonic chip as a substrate, and optical chips of an InP laser and an optical amplifier are heterogeneously integrated with the silicon photonic chip through bonding or flip-chip soldering. As a pump light source, the laser generates a soliton-based optical frequency comb by using an ultra-low loss silicon nitride (SiN) resonator cavity, and can be used as a multi-wavelength laser. This reduces use of a single-wavelength laser chip, reduces a power consumption and heat conduction of a laser in an optical chip of a photonic engine, and improves an integration level of an optical device. The optical frequency comb generates an optical carrier with wide bandwidth coverage and a large quantity of wavelengths.