Redundant SOA Silicon Photonics for Multi-Lane Optical Transmitters
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Solution Overview
Problem
Optical transmitters require high power consumption and have short laser lifetimes due to the use of multiple lasers or high-power lasers, leading to inefficiencies and complexity.
Innovation Solution
Implementing semiconductor optical amplifiers (SOAs) to amplify the power of a single laser output split into multiple lanes, paired with backup SOAs to mitigate failure and extend device lifetime, while using angled facets and anti-reflective coatings to manage reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple lasers are used to drive multiple lanes, then each lane can be driven independently, but power consumption increases and device complexity increases
Solution Approach 1:
The patent merges multiple laser functions into a single laser source that drives all lanes through optical splitting. Instead of having separate lasers for each lane, one laser output is split into multiple lanes using optical splitters, reducing the total number of lasers from N (for N lanes) to just 1, thereby significantly reducing power consumption while maintaining independent lane operation capability
Solution Approach 2:
The single laser is designed to serve multiple functions by driving multiple lanes simultaneously. The laser output is universally distributed to all lanes through optical splitting networks, allowing one laser to perform the work of multiple lasers while maintaining the ability to independently drive each lane
2Reliability
If multiple lasers are used to drive multiple lanes, then each lane can be driven independently, but device complexity increases
Solution Approach 1:
The patent combines multiple laser components into a single laser unit. By merging the functions of N lasers into 1 laser, the device complexity is reduced in terms of component count, integration points, and control electronics, while the optical splitting network maintains the capability for independent lane operation
Solution Approach 2:
The single laser is designed with universal functionality to drive multiple lanes. This multi-functional approach reduces device complexity by eliminating the need for multiple specialized laser components, each requiring separate mounting, control, and monitoring circuits
3Use of energy by moving object
If a single high-power laser is used to drive multiple lanes, then power consumption is reduced, but laser lifetime decreases
Solution Approach 1:
The patent segments the high-power laser output into multiple lower-power lanes using optical splitters. Instead of driving each lane directly with high power, the single laser output is divided into N portions, each lane receiving a fraction of the total power. This segmentation allows the laser to operate at optimal power levels while still driving multiple lanes, extending laser lifetime
Solution Approach 2:
Optical splitters act as intermediaries between the single laser and the multiple lanes. The splitter network distributes the laser output power evenly across all lanes, allowing the laser to operate at a power level that preserves its lifetime while still providing sufficient power to each lane through the intermediary splitting mechanism
4Use of energy by moving object
If semiconductor optical amplifiers are added to amplify laser output, then power efficiency improves, but device complexity and cost increase
Solution Approach 1:
The semiconductor optical amplifiers (SOAs) are positioned to perform preliminary amplification of the laser output before the light enters the optical splitting network. By amplifying the signal in advance, the system achieves better power efficiency at the source, and the subsequent splitting operations can proceed with adequate signal levels, reducing the need for additional amplification stages at each lane
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
Reduces power consumption and extends the lifetime of optical transmitters by leveraging SOAs, with backup SOAs ensuring reliability and efficiency in amplifying optical power for each lane.
Implementation Method 1
at least one semiconductor optical amplifier (SOA) configured to receive light and amplify the light to generate amplified light
Implementation Method 2
using angled facets and anti-reflective coatings to manage reflections
Data Source
AI summary
An optical transmitter includes a semiconductor optical amplifier (SOA) configured to receive light and amplify the light to generate amplified light. A backup SOA is also configured to receive light and amplify the light to generate backup amplified light. An SOA input switch selectively routes light toward either the SOA or the backup SOA. An output outputs the amplified light generated by the SOA or the backup SOA. Examples can include multiple lanes, each lane having an SOA, and each backup SOA being usable by one lane or two adjacent lanes.