QSFP Optical Transceiver PLC Multiplexer Cross-Talk
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Solution Overview
Problem
The rapid increase in global communication traffic necessitates faster and smaller communications components, particularly optical transceivers that can support high data transmission rates while being compact in size, as existing solutions struggle to efficiently multiplex and demultiplex signals across multiple optical channels with minimal cross-talk and size constraints.
Innovation Solution
The development of a small optical transceiver module using Planar Lightwave Circuit (PLC) technology, incorporating Mach Zehnder Interferometers (MZIs) and thin film filters, which demultiplexes optical signals into electrical signals and multiplexes them for transmission across a single optical fiber, reducing cross-talk and size, and is integrated into a Quad Small Form-factor Pluggable (QSFP) compliant housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If standard SFP transceivers are used to support high data transmission rates, then data transmission capability is improved, but device size and space occupation increase
Solution Approach 1:
The patent combines four independent optical transceiver channels into a single integrated QSFP module, merging multiple SFP transceivers into one unified device that occupies only 30% more space than a single SFP while providing 40 Gbps aggregate bandwidth through parallel optical channels
Solution Approach 2:
The QSFP transceiver module provides multi-functional capability by supporting four independent optical channels (4x10Gbps) within a single device, enabling it to replace multiple standard SFP transceivers and serve diverse communication needs through a universal form factor
2Productivity
If optical signals are multiplexed across multiple channels in a compact transceiver, then data transmission rate is improved, but signal cross-talk increases
Solution Approach 1:
The patent introduces planar lightwave circuit (PLC) technology as an intermediary component that provides optical isolation between multiple channels, enabling efficient signal multiplexing and demultiplexing while minimizing cross-talk through the inherent optical filtering and waveguide isolation properties of PLCs
3Volume of moving object
If four independent optical transceiver channels are integrated into one module, then space occupation is reduced, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical and discrete optical component assemblies with integrated planar lightwave circuit (PLC) technology, where optical paths, filters, and waveguides are fabricated as monolithic planar structures, significantly reducing assembly complexity and enabling compact integration of four channels
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
This solution enables efficient high-speed data transmission by effectively demultiplexing and multiplexing signals across multiple channels with reduced cross-talk, meeting the demand for compact and high-data-rate communication components, thereby supporting the growing global communication traffic.
Implementation Method 1
each optical sensor is shielded by a thin film filter that transmits light in one of the plurality of optical channels and blocks light in the other of the plurality of optical channels
Implementation Method 2
an optical filter, optionally a thin film filter (TFF), optically coupled to an output port of a Mach Zehnder Interferometer (MZI) for each optical channel for demultiplexing optical signals received by the receiving module to the optical channel
Implementation Method 3
An optical sensor, optionally a photodiode (PD), is coupled to the channel's TFF and generates electrical signals responsive to the optical signals demultiplexed to the channel
Implementation Method 4
the light source comprises a laser diode. Optionally the laser diode is a coarse wavelength division multiplexing (CWDM) distributed feedback (DFB) laser diode
Data Source
AI summary
An optical transceiver comprising: an optical transmitter having plurality of light sources controllable to generate optical signals in different optical channels, an output aperture, an optical multiplexer that multiplexes optical signals generated by the light sources and transmits them to exit the transceiver from the output aperture; an optical receiver having a plurality of optical sensors, an input aperture for receiving optical signals in a plurality of optical channels, a demultiplexer that demultiplexes signals received at the input aperture, and directs signals received in different channels to different optical sensors of the plurality of optical sensors; and a QSFP compliant housing that houses the transmitter and receiver.