Integrated Photonic Optical Assembly for Compact TOSA Coupling
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Solution Overview
Problem
Existing TOSA designs are challenging to assemble, costly, and difficult to fit into enclosures due to multiple components and the use of glass substrates that are poor thermal conductors.
Innovation Solution
An optical assembly comprising a laser unit with integrated circuits, a lightwave unit for phase shifting and combining optical signals, and an optical unit for focusing and outputting signals to a fiber-optic cable, utilizing ceramic substrates and semiconductor fabrication techniques to improve assembly and thermal management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate components are used in TOSA design, then optical signal processing capability is improved, but device complexity and assembly difficulty increase
Solution Approach 1:
The patent combines multiple separate optical components (laser, isolator, lens, waveguide) into a single integrated photonic chip. This merging eliminates the need for complex assembly of multiple discrete parts while maintaining all necessary optical signal processing functions, directly resolving the contradiction between capability and complexity
Solution Approach 2:
The integrated photonic chip serves multiple functions simultaneously - generating optical signals, isolating them, guiding them through waveguides, and focusing them through lenses. This multi-functionality consolidates what would traditionally require separate components into a single universal device, reducing assembly complexity while preserving full optical processing capability
2Reliability
If glass substrate is used for supporting carrier, then optical signal transmission is improved, but thermal conductivity deteriorates
Solution Approach 1:
The patent employs a composite material structure where a ceramic substrate provides mechanical support and thermal management, while integrated photonic structures made of optical-compatible materials handle signal transmission. This composite approach combines the thermal benefits of ceramics with the optical properties needed for signal transmission, resolving the contradiction between optical performance and thermal conductivity
3Adaptability or versatility
If wire bonds are made long to account for mechanical variations, then adaptability is improved, but RF performance deteriorates
Solution Approach 1:
The patent replaces traditional mechanical wire bond connections with integrated photonic waveguide structures that are monolithically formed on the chip. This substitution eliminates the need for long wire bonds while providing inherent mechanical stability through the integrated structure, maintaining adaptability to mechanical variations without compromising RF performance
4Adaptability or versatility
If multiple separate components are used in TOSA design, then optical function is improved, but manufacturing time and cost increase
Solution Approach 1:
By merging multiple optical components into a single integrated photonic chip, the patent enables all optical functions to be manufactured in one fabrication process rather than requiring separate manufacturing and assembly steps for each component, directly reducing manufacturing time and cost while maintaining full optical functionality
Solution Approach 2:
The patent transitions from discrete component parameters to integrated chip parameters, allowing all optical functions to be defined and manufactured with unified fabrication parameters. This parameter consolidation streamlines the manufacturing process, reducing both time and cost while preserving complete optical functionality
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 reduces assembly time and cost while enabling a compact design that fits into enclosures, enhancing thermal conductivity and signal processing efficiency.
Implementation Method 1
The lightwave circuit includes means for producing a phase shift between the first optical signal and the second optical signal
Implementation Method 2
an optical unit including a lens for focusing the phase shifted and combined first optical signal and second optical signal
Data Source
AI summary
An optical assembly includes a number of laser integrated circuits operative for outputting a like number of optical or laser signals. A lightwave circuit is positioned to receive the optical or laser signals and is operative to phase shift the optical or laser signals, combine the phase shifted optical or laser signals, and output the phase shifted and combined optical or laser signals. A lens is positioned to receive, focus and output the phase shifted and combined optical or laser signals output by the lightwave circuit to a core of a fiber-optic cable.