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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis

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Published on: December 22, 2015

A wideband, high-resolution vector spectrum analyzer for integrated photonics.

Yi-Han Luo^1,2, Baoqi Shi^1,3, Wei Sun¹

¹International Quantum Academy, 518048, Shenzhen, China.

Light, Science & Applications

|April 7, 2024

Summary

We developed a new vector spectrum analyzer (VSA) for optical spectrum analysis. This compact device accurately measures passive device properties and maps broadband laser spectra, advancing photonic systems.

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Area of Science:

Photonics and Spectroscopy
Optical Engineering
Laser Physics

Background:

Optical spectrum analysis is crucial for understanding matter, with spectrometers enabling trace gas detection and isotope analysis.
Increasing data demands higher spectral bandwidth and frequency resolution for spectrum analysis, especially for broadband lasers and dispersive devices.
Spectrum analyzers are needed to probe phase response for encoded information, driving innovation in measurement techniques.

Purpose of the Study:

To demonstrate a novel vector spectrum analyzer (VSA) capable of characterizing both passive devices and active laser sources in a single setup.
To enable comprehensive analysis of passive devices, including loss, phase response, and dispersion.
To coherently map broadband laser spectra into the radio frequency (RF) domain for advanced applications.

Main Methods:

Development of a novel, compact, and robust fiber-based vector spectrum analyzer (VSA).
The VSA operates without high-speed modulators, photodetectors, or active feedback control.
Utilized the VSA for characterizing integrated dispersive waveguides, mapping frequency comb spectra, and coherent light detection and ranging (LiDAR).

Main Results:

The VSA achieved a bandwidth of 55.1 THz (1260-1640 nm) with a frequency resolution of 471 kHz and a dynamic range of 56 dB.
Successfully characterized passive devices, measuring loss, phase response, and dispersion properties.
Demonstrated coherent mapping of broadband laser spectra into the RF domain.

Conclusions:

The novel dual-mode VSA offers an innovative approach for device analysis and laser spectroscopy.
This compact and robust VSA is suitable for diverse applications in sensing, communication, imaging, and quantum information processing.
The VSA can play a critical role in the advancement of future photonic systems.