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Frequency Response of Op Amp Circuits

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Operational amplifiers (op-amp) are used in signal conditioning, filtering, or for performing mathematical operations such as addition, subtraction, integration, and differentiation. The frequency response of an op-amp is an important aspect that describes how the gain of the amplifier varies with frequency.
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Updated: Jul 1, 2025

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Quantum State Engineering of Light with Continuous-wave Optical Parametric Oscillators

Published on: May 30, 2014

Integrated frequency-modulated optical parametric oscillator.

Hubert S Stokowski¹, Devin J Dean¹, Alexander Y Hwang¹

¹Department of Applied Physics and Ginzton Laboratory, Stanford University, Stanford, CA, USA.

|March 6, 2024

Summary

This summary is machine-generated.

We developed a new type of microcomb using electro-optics and parametric amplification. This frequency-modulated optical parametric oscillator (FM-OPO) offers high efficiency and broad bandwidth for precision measurement tools.

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Area of Science:

Photonics
Quantum Optics
Integrated Optics

Background:

Optical frequency combs are crucial for precision measurement and spectroscopy.
Microcombs integrate comb generation into compact photonic platforms.
Existing microcombs (electro-optic, Kerr) face challenges in efficiency and bandwidth.

Purpose of the Study:

Introduce a novel class of microcomb: the frequency-modulated optical parametric oscillator (FM-OPO).
Demonstrate a compact, integrated device combining electro-optics and parametric amplification.
Address limitations of current microcomb technologies regarding efficiency and bandwidth.

Main Methods:

Fabricated an integrated FM-OPO device using thin-film lithium niobate.
Utilized a hybrid approach combining electro-optic modulation and parametric amplification.
Characterized the device's spectral properties and conversion efficiency.

Main Results:

Achieved pump-to-comb internal conversion efficiency over 93% (34% out-coupled).
Generated a nearly flat-top spectrum spanning approximately 200 modes (>1 THz).
Demonstrated broadband comb generation determined by cavity dispersion, requiring lower RF modulation power.

Conclusions:

The FM-OPO microcomb offers a new paradigm for compact, high-performance optical frequency combs.
This technology promises robust operation, high efficiency, and broad bandwidth.
Potential applications include metrology, spectroscopy, telecommunications, sensing, and computing.