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Bandpass Sampling01:17

Bandpass Sampling

681
In signal processing, bandpass sampling is an effective technique for sampling signals that have most of their energy concentrated within a narrow frequency band. This type of signal is known as a bandpass signal. The key principle of bandpass sampling involves sampling the signal at a rate that is greater than twice the signal's bandwidth to prevent aliasing.
A bandpass signal has a spectrum with a lower frequency limit, denoted as ω1, and an upper frequency limit, denoted as ω2....
681
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
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Updated: May 5, 2026

Quasi-light Storage for Optical Data Packets
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Wideband optical vector network analyzer based on optical single-sideband modulation and optical frequency comb.

Min Xue, Shilong Pan, Chao He

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    A new method expands the measurement range of optical vector network analyzers (OVNA) using optical single-sideband (OSSB) modulation and optical frequency combs. This technique enables precise characterization of optical devices over broad frequency spans.

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    Area of Science:

    • Photonics and Optical Engineering
    • Measurement Science and Instrumentation

    Background:

    • Optical Vector Network Analyzers (OVNA) are crucial for characterizing optical devices.
    • Increasing the measurement range of OVNA systems is a significant challenge in optical metrology.
    • Existing methods often face limitations in dynamic range and spectral coverage.

    Purpose of the Study:

    • To propose and demonstrate a novel approach for extending the measurement range of OVNA systems.
    • To leverage optical single-sideband (OSSB) modulation and optical frequency combs (OFC) for enhanced OVNA performance.
    • To accurately measure the magnitude and phase responses of optical devices over a wide frequency spectrum.

    Main Methods:

    • Utilizing an optical frequency comb (OFC) with selected comb lines as optical carriers.
    • Employing optical single-sideband (OSSB) modulation for each selected comb line.
    • Measuring the frequency responses of an optical device-under-test (ODUT) channel by channel.
    • Fitting the responses from multiple channels to reconstruct the device's overall magnitude and phase characteristics.

    Main Results:

    • Experimental demonstration of the proposed OSSB-based OVNA system.
    • Achieved a measurement range of 105 GHz.
    • Obtained a frequency resolution of 1 MHz.
    • Successfully measured the magnitude and phase responses of a fiber Bragg grating.

    Conclusions:

    • The proposed method effectively increases the measurement range of OVNA systems.
    • The combination of OSSB modulation and OFC provides accurate and broad spectral characterization.
    • This approach offers a promising solution for high-resolution, wide-range optical device measurements.