Monolithic Optical Transmitter for Advanced Modulation
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Solution Overview
Problem
Existing optical transmitters for advanced modulation formats are large and require complex fabrication processes, leading to high costs and inefficiencies due to low waveguide losses and the need for refined subcomponents.
Innovation Solution
A compact optical transmitter with a reduced die size, integrating a tunable laser and optical vector modulators on a single monolithic substrate, using simple integration platforms and techniques like semiconductor processing, to reduce fabrication complexity and improve yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large-scale monolithic photonic integrated circuits are used to generate advanced modulation formats, then optical signal generation capability is improved, but device size and fabrication complexity increase
Solution Approach 1:
The patent divides the optical transmitter into separate functional modules: a laser source unit, an optical vector modulator unit, and a polarization controller unit. Each module can be independently designed, fabricated, and tested before final assembly, reducing the overall fabrication complexity while maintaining the capability to generate advanced modulation formats through the coordinated operation of these segmented components.
2Reliability
If large-scale monolithic photonic integrated circuits are used, then modulation format generation is improved, but die size increases
Solution Approach 1:
The patent implements a compact architecture where the optical vector modulator is integrated within or adjacent to the laser source, and the polarization controller is embedded within the modulator structure. This nested arrangement allows the functional equivalents of a large-scale monolithic circuit to be packed into a much smaller footprint, reducing die size while preserving advanced modulation format generation capability.
3Manufacturing precision
If refined fabrication processes are used to reduce defects, then manufacturing precision is improved, but production time and cost increase
Solution Approach 1:
The patent extracts the most critical and difficult-to-fabricate components (such as the optical vector modulator with its precise waveguide structures) and designs them as separate, standardized modules that can be manufactured using optimized, specialized processes. The less critical components are fabricated using simpler, faster processes. This extraction allows each component to receive the precise fabrication treatment it needs without forcing the entire production process to be slow and complex.
4Ease of manufacture
If simple integration platforms are used, then ease of manufacture is improved, but device performance may deteriorate
Solution Approach 1:
The patent applies different fabrication qualities to different parts of the device based on their functional requirements. Critical components requiring high precision (such as the optical vector modulator waveguides) are fabricated using refined processes, while less sensitive components use simpler processes. This localized application of manufacturing quality allows the overall device to be manufacturable with simple integration platforms while maintaining the high performance required for advanced modulation formats in the critical functional areas.
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 compact, efficient, and stable optical transmitter with reduced footprint, improved performance, and tolerance for waveguide losses, allowing for precise phase control and efficient data throughput in optical networks.
Implementation Method 1
a tunable laser resonator... configured to emit optical radiation
Implementation Method 2
tunable laser resonator... wavelength of the emitted optical radiation is tunable
Implementation Method 3
an optical vector modulator... modulating both optical intensity and optical phase to generate optical vector modulation
Data Source
AI summary
In various embodiments, a monolithic integrated transmitter, comprising an on-chip laser source and a modulator structure capable of generating advanced modulation format signals based on amplitude and phase modulation are described.