Integrated Driver IC and Optical Modulator Substrate
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Solution Overview
Problem
Existing optical communication systems face challenges in integrating high-speed driver ICs and optical modulators within a common package due to differences in fabrication techniques and materials, leading to separate packaging and increased power requirements.
Innovation Solution
The integration of a driver IC and optical modulator on a common substrate, using compatible technologies like Indium-Phosphide or Galium-Arsenide, with digital signal processing to control the effective length of the modulator's control region, allowing for direct binary logic state control without signal conditioning or power amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If driver IC and optical modulator are packaged separately using different fabrication techniques, then manufacturing flexibility is maintained, but device complexity and power requirements increase
Solution Approach 1:
The patent combines the driver IC and optical modulator into a single integrated device fabricated on a common substrate using compatible semiconductor processes. This merging eliminates the need for separate packaging and interconnection, directly resolving the contradiction by achieving both manufacturing simplicity and reduced device complexity simultaneously.
2Loss of energy
If driver IC and optical modulator are packaged separately, then impedance matching is easier to achieve, but power consumption increases due to signal conditioning requirements
Solution Approach 1:
By integrating the driver IC and optical modulator on the same substrate, the patent eliminates power-consuming signal conditioning circuits and external impedance matching networks. The direct integration ensures inherent impedance matching, simultaneously reducing power consumption and maintaining manufacturing precision.
3Volume of moving object
If separate packaging is used for driver IC and optical modulator, then thermal management is simpler, but the assembly size increases
Solution Approach 1:
The patent integrates both components on a single substrate, dramatically reducing the overall assembly size. The shared substrate provides inherent thermal pathways, and the close proximity of components enables efficient heat dissipation, simultaneously achieving compact form factor and effective thermal management.
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 approach enables a compact, low-power assembly capable of high-speed operation, reducing manufacturing complexities and improving impedance matching, while maintaining precision and control for optical signal modulation.
Implementation Method 1
The optical modulator 4 operates to modulate the amplitude and/or phase the carrier signal 6 to generate the optical communications signal 8 based on a drive signal 10
Implementation Method 2
The laser 2 generates a narrow-band continuous wave (CW) optical carrier signal 6 having a desired wavelength
Data Source
AI summary
A method of modulating an optical carrier. A target carrier modulation is computed based on an input data signal. An effective length of an optical modulator is then controlled based on the target carrier modulation.