Phys.org July 27, 2023 The formation of a broadband optical frequency comb relies on careful engineering of the group velocity dispersion (GVD) of the waveguide, which is challenging for platforms where the GVD is mainly determined by the material. An international team of researchers (USA – UC Santa Barbara, Egypt) has generated a 60 GHz quantum-dot (QD) mode-locked laser in which both the amplitude-modulated (AM) and the frequency-modulated (FM) comb could be generated independently. The high four-wave-modulated (FWM) efficiency of –5 dB allowed the QD laser to generate FM comb efficiently. They demonstrated that the Kerr nonlinearity could be practically engineered to […]
Tag Archives: Optical frequency comb
Breakthrough research to revolutionise internet communication
Phys.org April 18, 2019 To reduce the power consumed by the internet an international team of researchers (Germany, Austria, New Zealand, Russia) has created a device called a microresonator optical frequency comb made of a tiny disc of crystal. The device transforms a single colour of laser light into a rainbow of 160 different frequencies – each beam totally in sync with each other and perfectly stable. One such device could replace hundreds of power-consuming lasers currently used to encode and send data around the world. They expect the devices to be incorporated in sub-oceanic landing stations where all the […]