Optical parametric mixer-based passive phase correction for stable transfer of millimeter waves

Area of Science:

• Optics and Photonics
• Telecommunications Engineering
• Signal Processing

Background:

• Stable distribution of high-frequency millimeter-wave signals over optical fiber is crucial for advanced communication and sensing.
• Conventional electronic devices face bandwidth limitations in handling such high frequencies.
• Transmission delay fluctuations in fiber links can degrade signal phase stability.

Purpose of the Study:

• To propose and experimentally validate a passive phase correction scheme for stable millimeter-wave signal distribution over fiber links.
• To overcome the bandwidth limitations of conventional electronic devices for high-frequency signal transmission.
• To achieve high remote frequency stability immune to transmission delay fluctuations.

Main Methods:

• Utilizing a parametric mixer realized via ultrafast four-wave mixing processes.
• Implementing a passive phase correction scheme.
• Mixing round-trip probe and local pump signals to generate a delay-immune signal.
• Experimentally distributing a 36-GHz millimeter-wave signal over a 20-km optical fiber link.

Main Results:

• The proposed scheme successfully distributed a 36-GHz millimeter-wave signal over a 20-km optical fiber.
• The remote frequency stability achieved was 4.0×10^-16 at 2000 s.
• The generated signal demonstrated immunity to transmission delay fluctuations.

Conclusions:

• The parametric mixer approach offers a promising solution for phase-stabilized delivery of high-frequency signals.
• This method overcomes the bandwidth limitations inherent in traditional electronic devices.
• The achieved frequency stability indicates suitability for demanding applications in optical fiber communication and metrology.