Photonic Clock Multiplier Circuit Using Phase-Shifted Signal Combining
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Solution Overview
Problem
Current photonic processors face limitations in achieving high processing speeds due to the need for substantially higher clock rates, which existing technologies are unable to support effectively.
Innovation Solution
A photonic circuit is designed to generate an ultrafast clock multiplier using a beam splitter, phase shifter, and photonic combiners, which splits and combines photonic seed clock signals to produce a photonic clock signal with a significantly higher rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If existing photonic circuit technologies are used, then device complexity is kept manageable, but processing speed and clock rate are insufficient for future high-speed applications
Solution Approach 1:
The photonic circuit is segmented into multiple functional modules including beam splitters, phase shifters, photonic combiners, delay circuits, and attenuators. Each module performs a specific function in the clock multiplication process, allowing the complex overall system to be managed through modular design where each segment can be optimized and replaced independently.
Solution Approach 2:
The patent implements nested clock multiplication stages where the output of one multiplication stage becomes the input for the next stage. This nested structure allows progressive clock rate multiplication (e.g., 2x, 4x, 8x, 16x) by cascading multiple identical or similar circuit modules, reducing the need to design entirely new complex circuits for each multiplication factor.
2Speed
If higher clock rates are implemented, then processing speed increases, but signal integrity and stability become more difficult to maintain
Solution Approach 1:
The circuit applies preliminary phase shifting and delay adjustments to clock signals before combining them. By pre-conditioning the signals with appropriate phase shifts (e.g., π/2, π, 3π/2) and delays, the system ensures that signals arrive at the photonic combiners in optimal conditions for constructive interference, maintaining signal integrity at higher clock rates.
Solution Approach 2:
The system incorporates feedback mechanisms where the output clock signal is monitored and used to adjust the operation of beam splitters, phase shifters, and delay circuits. This feedback allows real-time compensation for signal degradation, phase drift, and other instability issues that arise at ultrafast clock rates, ensuring consistent signal quality.
3Productivity
If photonic clock signals with rates up to several hundred gigabits per second are generated, then productivity increases, but energy consumption and switching energy requirements increase
Solution Approach 1:
The patent replaces traditional electronic switching mechanisms with photonic-based operations. By using beam splitters, phase shifters, and photonic combiners to manipulate light signals directly in the optical domain, the system eliminates the need for high-speed electronic switches and converters that consume significant energy, thereby achieving ultrafast clock rates with reduced switching energy consumption.
Solution Approach 2:
The circuit generates clock signals through periodic modulation and combination of input signals at different phases and delays. This periodic action allows the system to produce high-frequency output clocks by multiplying lower-frequency input clocks, achieving high productivity without requiring proportionally high energy input, as the photonic components operate passively or with minimal active control.
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 proposed solution enables the generation of photonic clock signals with rates up to several hundred gigabits per second, effectively supporting higher processing speeds and addressing the limitations of current photonic processors.
Implementation Method 1
the beam splitter is configured to split the photonic seed clock signal into a first photonic seed clock signal and a second photonic seed clock signal
Implementation Method 2
the phase shifter is configured to shift a phase of the received photonic signal to generate a phase-shifted version of the photonic signal
Implementation Method 3
The first photonic combiner is configured to combine the second photonic seed clock signal with the phase-shifted version of the photonic signal to generate a first combined photonic signal
Data Source
AI summary
A photonic circuit for generating an ultrafast clock for a photonic processor. The photonic circuit includes a beam splitter, a phase shifter, a first photonic combiner coupled to the beam splitter and the phase shifter, and a second photonic combiner coupled to the beam splitter and the first photonic combiner. The beam splitter splits a received photonic seed clock signal into a first photonic seed clock signal and a second photonic seed clock signal. The phase shifter shifts a phase of a received photonic signal to generate a phase-shifted version of the photonic signal. The first photonic combiner combines the second photonic seed clock signal with the phase-shifted version of the photonic signal to generate a first combined photonic signal. The second photonic combiner combines a delayed and attenuated version of the first photonic seed clock signal with the first combined photonic signal to generate a photonic clock signal.