Phase noise of an electro-optic terahertz comb

Krause, Benedikt L. (author), Lavrič, Andrej (author), Tebart, Jonas (author), Stöhr, Andreas (author), Preu, Sascha (author)

Photonic millimeter wave and terahertz frequency generation and detection benefit from a large tunability of several octaves as opposed to electronic frequency generation and multiplication. However, reaching multiple 100 GHz continuous tuning range while simultaneously featuring a 3-dB linewidth in the Hz range and low phase noise is still very challenging. We present an electro-optical comb driving a photomixer with potential usability as an extension module based on side-band generation by an electro-optical phase modulator. This enables a Hz-level 3-dB linewidth from microwaves to terahertz frequencies. We discuss the working principle of the mentioned electro-optical comb, characterize the phase noise of the optical subsystem up to frequencies of 40 GHz where electronic phase noise analyzers are available and draw conclusions on the phase noise at higher frequencies in the THz domain.

• Language: English
• Keywords: phase noise, electro-optic THz comb, THz source, photomixer, phase modulation
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: FE - Faculty of Electrical Engineering
• Publication status: Published
• Publication version: Version of Record
• Year: 2024
• Number of pages: Str. 20948-20958
• Numbering: Vol. 32, no. 12
• PID: 20.500.12556/RUL-168751
• UDC: 621.39
• ISSN on article: 1094-4087
• DOI: 10.1364/OE.520197
• COBISS.SI-ID: 196599299
• Publication date in RUL: 23.04.2025

Record is a part of a journal

• Title: Optics express
• Shortened title: Opt. express
• Publisher: Optical Society of America
• ISSN: 1094-4087
• COBISS.SI-ID: 8636438

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: fazni šum, elektrootpični teraherčni glavnik, THz izvor, fotomešalnik, fazna modulacija