Photonic Integrated Circuit Optical Transmitter Emitter Lifetime Management
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Solution Overview
Problem
Current optical transmitter systems using discrete optical devices on printed circuit boards face challenges in reducing costs and increasing efficiency, particularly in implementing photonic integrated circuits similar to electric integrated circuits.
Innovation Solution
The development of optical transmitters that include multiple photonic integrated circuits configured to output optical signals across different wavelength ranges, with a wavelength division multiplexer to combine these signals, and a power management system to extend the lifetime of emitters by using auxiliary emitters when main emitters reach threshold intensity values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If discrete optical devices are assembled on a printed circuit board, then the system can be easily manufactured and maintained, but the cost reduction and efficiency improvement are limited
Solution Approach 1:
The patent integrates multiple optical devices (lasers, modulators, filters, detectors) onto a single photonic integrated circuit substrate, merging previously discrete components into one unified device. This integration maintains manufacturing ease while dramatically improving data transmission efficiency through compact interconnections and reduced signal loss.
Solution Approach 2:
The patent transitions from two-dimensional PCB assembly to three-dimensional photonic integration, stacking optical components in multiple layers on the substrate. This dimensional change enables higher component density and more efficient light paths, improving productivity without sacrificing manufacturability.
2Adaptability or versatility
If multiple discrete optical devices are used to achieve different wavelength ranges, then the system can provide diverse optical signals, but the cost increases and scale economy is lost
Solution Approach 1:
The photonic integrated circuit substrate serves multiple functions simultaneously: it hosts laser emitters for different wavelength ranges (C-band, L-band), integrates modulators for signal encoding, includes filters for wavelength selection, and incorporates detectors for reception. This multi-functionality on a single substrate provides diverse optical signals while reducing device complexity.
Solution Approach 2:
The patent segments the photonic integrated circuit into functional modules (emitter arrays, modulator sections, filter banks, detector arrays) that can be independently designed and optimized. Each segment handles specific wavelength ranges or functions, enabling versatility while maintaining manageable complexity through modular architecture.
3Productivity
If multiple emitters are operated simultaneously to increase data transmission capacity, then the productivity increases, but the lifetime of individual emitters decreases due to higher stress
Solution Approach 1:
The patent implements dynamic emitter management where the system can selectively activate or deactivate specific laser emitters based on real-time conditions. When one emitter approaches its operational limit, the system dynamically switches to another emitter within the same wavelength range, maintaining high data transmission capacity while extending the effective lifetime of the emitter array through load distribution and rotational usage.
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 multiplexing of optical signals, reduces costs by minimizing the need for multiple discrete devices, and extends the operational lifetime of the optical transmitter by selectively using spare emitters when main emitters reach end-of-life, thereby enhancing the overall performance and reliability of the system.
Implementation Method 1
a first emitter configured to emit a first beam having a first wavelength in the first wavelength range
Implementation Method 2
a wavelength division multiplexer configured to combine the first optical transmission signal with the second optical transmission signal
Data Source
AI summary
An optical transmitter includes photonic integrated circuits configured to respectively output optical transmission signals in different wavelength ranges. A photonic integrated circuit may include emitters configured to emit beams having different wavelengths; drivers configured to respectively provide power to the emitters, and a wavelength division multiplexer configured to transmit the beams emitted by the emitters. A photonic integrated circuit may include a switch device that controls the drivers, and light detectors configured to detect intensities of the beams emitted from the emitters. The switch device may selectively operate at least one driver of the plurality of drivers based on information associated with intensities of the beams. The switch device may selectively operate a driver connected to an emitter, based on a determination that an intensity of a beam emitted by another emitter is less than a threshold intensity value.