100 Gbps Optical Transceiver Using WDM and PAM
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Solution Overview
Problem
Current optical transceivers lack a suitable architecture for high-speed data communications in the 100 Gbps range in a small, pluggable form factor, limiting their application in high-throughput optical fiber networks.
Innovation Solution
A high-speed optical transceiver module that utilizes multilevel digital pulse amplitude modulation (PAM) encoding and wavelength division multiplexing (WDM) technology, incorporating four 10 Gbps distributed feedback lasers, an optical multiplexer, and signal timing circuits to achieve 100 Gbps data transmission over a single optical fiber, with a compact and standardized form factor suitable for both short-range and long-haul applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional optical transceiver architecture is used, then device complexity is reduced, but data transmission speed cannot achieve 100 Gbps
Solution Approach 1:
The transceiver divides the 100 Gbps data transmission into four parallel lanes, each operating at 10 Gbps. This segmentation allows the system to achieve high overall throughput while keeping individual lane complexity manageable and enabling the use ofๆ็ technologies for each lane.
Solution Approach 2:
The patent combines four 10 Gbps optical signals into a single 100 Gbps transmission channel using wavelength division multiplexing (WDM). This merging technique aggregates the capacity of multiple simpler channels to achieve high-speed transmission without requiring a single complex transceiver architecture.
2Volume of moving object
If miniaturization is pursued for compact form factor, then device size is reduced, but transmission distance capability deteriorates
Solution Approach 1:
The transceiver is designed to provide multiple transmission distance capabilities (short reach up to 300 meters and long reach up to 40 kilometers) within a single compact device. This multi-functionality allows the same miniaturized transceiver to serve different application scenarios without requiring separate devices for each distance range.
Solution Approach 2:
The system achieves different transmission distances by changing operational parameters such as modulation schemes and signal processing techniques rather than requiring physical size changes. This allows the compact form factor to be maintained while adapting to different transmission distance requirements through software or configuration changes.
3Productivity
If wavelength division multiplexing is used to increase bandwidth, then data transmission capacity is improved, but device complexity increases
Solution Approach 1:
The patent introduces wavelength division multiplexing as an intermediary technique that operates at the optical layer, allowing four separate 10 Gbps data streams to be combined into a single 100 Gbps transmission. This intermediary approach increases capacity without requiring complex electrical signal processing for each individual data stream.
Solution Approach 2:
The system replaces complex electrical signal processing and data processing with optical-domain operations. By performing multiplexing and signal processing in the optical domain rather than the electrical domain, the system achieves high capacity transmission while reducing the complexity of electronic components and signal processing circuits.
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
Enables efficient transmission of 100 Gbps data over a single optical fiber, supporting distances up to 300 meters in multimode fibers or 40 kilometers in single-mode fibers, while maintaining a compact and standardized form factor, addressing the need for increased bandwidth and miniaturization in high-speed data communications.
Implementation Method 1
a modulator for converting between an information-containing electrical signal on each data line and a pulse amplitude modulated signal corresponding to the binary electrical signal
Implementation Method 2
an optical multiplexer for multiplexing the respective optical beams into a single optical beam for transmission over the optical fiber
Implementation Method 3
at least one electro-optical subassembly in the housing for converting between an information containing electrical signal and a modulated optical signal corresponding to the electrical signal including a transmitter subassembly including first and second lasers operating at different wavelengths
Data Source
AI summary
An optical transmitter for converting and coupling an information-containing electrical signal with an optical fiber having an electrical input for coupling with an external electrical cable or information system device having a plurality of parallel data lines, a modulator for converting between an information-containing electrical signal on each data line and a multi-level digital pulse amplitude modulated signal corresponding to the binary electrical signal; and a signal timing circuit coupled to said modulator for aligning the data signal to a predetermined clock signal. The transmitter is preferably wavelength division multiplexed, using an electro-optical subassembly coupled to each respective timer circuit for converting between the information-containing electrical signal and a modulated optical signal corresponding to the electrical signal at a predetermined wavelength. The transceiver is preferably implemented in a pluggable standardized form factor.