Sevensix Launches Optical Frequency Comb Generator “Frush” in the U.S. Market

TOKYO--(BUSINESS WIRE)--May 30, 2025--

Sevensix Inc. (Headquarters: Minato-ku, Tokyo; CEO: Yosuke Hane) is pleased to announce the full-scale launch of its proprietary optical frequency comb generator, Frush, in the U.S. market starting October 2025.

This press release features multimedia. View the full release here: https://www.businesswire.com/news/home/20250520744574/en/

Frush is a next-generation optical platform that enables the generation of optical frequency combs—essential for advanced optical communications, quantum optics, and precision spectroscopy—with remarkably simple operation. Designed for both research and industrial environments, Frush delivers exceptional reliability and repeatability. The system has already earned strong endorsements from leading universities and research institutions in Japan and abroad.

As part of the U.S. rollout, Sevensix is partnering with a nationwide network of distributors and technical support providers to ensure responsive local service. This structure is tailored to meet the rigorous reliability and support expectations of American researchers and engineers.

Optical Frequency Comb Generator “Frush”
Details: https://www.sevensix.co.jp/eng/products/frush/

Features

Frush is a highly reliable and robust EO-based optical comb generator that utilizes a single dual-drive Mach-Zehnder modulator combined with Sevensix’s proprietary auto-bias control system. With turnkey operation, Frush generates a stable optical frequency comb spectrum within just 10 seconds of startup.

Frush accepts two external signal sources—a narrow-linewidth laser and an RF signal generator—allowing users to fully leverage their existing equipment. This enables the generation of optical frequency combs with minimal initial investment and offers the flexibility to easily switch signal sources depending on the application or environment.

By passing the Frush output through a high-power EDFA and a highly nonlinear optical fiber, the optical comb spectrum can be broadened to several tens of nanometers and compressed to sub-picosecond pulse durations. Additionally, Frush enables advanced functionalities such as phase-locking two narrow-linewidth lasers separated by approximately 300 GHz. A wide range of upgrades is available to meet diverse application needs.

Specifications

Center wavelength: 1550 ± 20 nm
-20 dB spectral width: > 200 GHz
Average output power: > -5 dBm at 13 dBm optical input
Pulse duration: ≦ 6 ps (Compressed)
Comb spacing: 12 to 18 GHz (Factory default fixed)
Input/Output fiber port: FC/APC
Polarization: Linearly polarization is possible
Size H×W×D: 148×480×430 mm

 

Optical Frequency Comb Platform

DENVER (AP) — A Frontier Airlines plane hit and killed a pedestrian on the runway of the Denver International Airport during takeoff, airport authorities said, sparking an engine fire and forcing passengers to evacuate.

The plane, on route from Denver to Los Angeles International Airport, “reported striking a pedestrian during takeoff at DEN at approximately 11:19 p.m. on Friday," the airport's official X account wrote.

A spokesperson for the airport said the pedestrian, who jumped a perimeter fence, has died. They said the unidentified person was hit two minutes after entering the airport. The person is not believed to be an airport employee.

“We're stopping on the runway,” the pilot tells the control tower according to the site ATC.com. “We just hit somebody. We have an engine fire.”

The pilot tells the air traffic controller they have “231 souls” on board and that an “individual was walking across the runway.”

The air traffic controller responds that they are “rolling the trucks now" before the pilot tells the tower they “have smoke in the aircraft. We are going to evacuate on the runway.”

Frontier Airlines said in a statement flight 4345 was the one involved in the collision and that “smoke was reported in the cabin and the pilots aborted takeoff.” It was not clear whether the smoke was linked to the crash with the pedestrian.

“The Airbus A321 was carrying 224 passengers and seven crew members,” the airline said. “We are investigating this incident and gathering more information in coordination with the airport and other safety authorities.”

Passengers were then evacuated via slides and the emergency crew bused them to the terminal. The airport spokesperson said 12 passengers suffered minor injuries and five were taken to local hospitals.

Denver Airport said the National Transportation Safety Board had been notified and that runway 17L, where the incident took place, will remain closed while an investigation is conducted. It is expected to open later today.

The pedestrian death came a day after a Delta Air Lines employee was killed while on the job at the Orlando International Airport. In a statement, the airline said the employee was killed Thursday night without providing details of the incident nor the name of the employee.

“We are focused on extending our full support to family and taking care of our Orlando team during this difficult time,” the airline said. "We are working with local authorities as a full investigation gets underway to determine what occurred.”

FILE - A Frontier Airlines jetliner taxis down a runway for take off from Denver International airport on Nov. 25, 2025, in Denver. (AP Photo/David Zalubowski, File)