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Upsampling

Upsampling

Managing signal sampling rates is essential in digital signal processing to maintain signal integrity. A decimated signal, characterized by a reduced frequency range due to its lower sampling rate, can be upsampled by inserting zeros between each sample. This upsampling process expands the original spectrum and introduces repeated spectral replicas at intervals dictated by the new Nyquist frequency. To refine this zero-inserted sequence, it is passed through a lowpass filter with a cutoff...

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Accurate signal sampling and reconstruction are crucial in various signal-processing applications. A time-domain signal's spectrum can be revealed using its Fourier transform. When this signal is sampled at a specific frequency, it results in multiple scaled replicas of the original spectrum in the frequency domain. The spacing of these replicas is determined by the sampling frequency.
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Related Experiment Video

Updated: May 12, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Reducing noise in single-photon-level frequency conversion.

Paulina S Kuo¹, Jason S Pelc, Oliver Slattery

¹Information Technology Laboratory, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA. pkuo@nist.gov

|April 19, 2013

Summary

This summary is machine-generated.

We achieved high-efficiency, low-noise frequency conversion using a periodically poled lithium niobate (PPLN) waveguide. This breakthrough enhances single-photon upconversion detection for quantum information applications.

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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: June 8, 2018

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Last Updated: May 12, 2026

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source

Published on: April 4, 2017

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Area of Science:

Photonics
Quantum Optics
Materials Science

Background:

Frequency conversion is crucial for manipulating light properties.
Periodically poled lithium niobate (PPLN) waveguides offer efficient nonlinear optical processes.
Achieving both high efficiency and low noise simultaneously is a significant challenge.

Purpose of the Study:

To demonstrate low-noise and efficient frequency conversion using sum-frequency mixing in a PPLN waveguide.
To investigate the impact of spectral filtering on noise reduction.
To explore applications in single-photon upconversion detection and quantum information.

Main Methods:

Sum-frequency mixing in a PPLN waveguide.
Utilizing a 1556 nm pump laser to convert 1302 nm photons to 709 nm photons.
Implementing careful spectral filtering to minimize noise.

Main Results:

Achieved 70% internal and >50% external conversion efficiency.
Obtained low noise levels with 600 counts per second at peak conversion.
Demonstrated simultaneous high conversion efficiency and low noise operation.
Successful continuous-wave pumping was employed.

Conclusions:

Low-noise, high-efficiency frequency conversion is feasible in PPLN waveguides.
Spectral filtering is key to achieving simultaneous low noise and high efficiency.
This technique has significant implications for advancing single-photon upconversion detection and quantum information processing.