When a system's specifications call for a lowpass filter with a steep frequency-cutoff characteristic, an engineer can opt for a “brick-wall”- filter design that features a sharp transition band. For ...

(Nanowerk News) Researchers at Tohoku University have addressed one of the key challenges of electromagnetic waves in the terahertz frequency range by developing a new type of tuneable filter for ...

Optical frequency combs, generated by means of self-referenced and stabilized mode-locked lasers, have enabled revolutionary progress in precision optical frequency synthesis and metrology 1,2,3,4.

The path toward an even faster internet has been hindered by energy consumption and cost per optical component. Researchers have designed a tunable filter -- an important component of high-capacity ...

Scientists have developed a new filter with the widest tuning span ever demonstrated on a silicon chip that could help provide the low-cost flexibility needed for next generation of high-speed optical ...

A new filter with the widest tuning span on a silicon chip could provide the low-cost flexibility needed for the next gen of high-speed optical networks The amount of data that flows over the internet ...

Schematic concept of the developed tunable filter. (a) Cross-sectional view of the filter; (b) relationship between period and refractive index; (c) frequency shift due to the change of refractive ...

A new filter with the widest tuning span ever demonstrated on a silicon chip could help provide the low-cost flexibility needed for the next generation of high-speed optical networks WASHINGTON - The ...

The filter tuning is achieved with micro-heaters in the silicon chip that control the local temperature, which in turns affects the nanostructures and the frequencies they separate. The wide tuning ...