Ultrasound-modulated optical tomography (UOT) combines optical contrast with ultrasound spatial resolution and has great potential for soft tissue functional imaging. One current problem with this technique is the weak optical modulation signal, primarily due to strong optical scattering in diffuse media and minimal acoustically induced modulation. The acoustic radiation force (ARF) can create ...

A Wavelength Division Multiplexing (WDM) system is a high-speed optical transmission system that simultaneously transports optical signals of different wavelengths over a single optical fiber. WDM was developed as a next generation optical signal transport technology after traditional Time Division Multiplexed (TDM) systems offering much greater potential capacities. TDM is the most popular tec...

Optical modulators (OMs) are a key device in modern optical systems. Due to its unique optical properties, graphene has been recently utilized in the fabrication of optical modulators, which promise high performance such as broadband response, high modulation speed, and high modulation depth. In this paper, the latest experimental and theoretical demonstrations of graphene optical modulators (G...

Article history: Received 18 February 2017 Accepted 15 May 2017 Available online 18 May 2017

We have developed optically-addressed and electrically-addressed liquid crystal spatial phase-only light modulators without pixelized structures. We obtained a large depth of phase-only modulation based on the electro-optical characteristics of a parallel-aligned nematic liquid crystal. We also confirmed that the satisfactory phase modulation capability and high diffraction efficiency of these ...

It can be argued that optical communications had its origins in ancient times, where modulated sunlight was often used to convey information over large distances. For example, mirrors have been used to create bright flashes of light in certain directions, producing a form of on–off modulation. Similarly, blankets used to cover a signal fire periodically produced puffs of smoke that could be see...

This work describes an experimental system for sensing and transmission of electric signals using optical coherence modulation of light. The system consists of a Ti:LiNbO3 optical coherence modulator acting as electric signal sensor. The main characteristics of coherence-modulated transmissions include the need of using broad-band optical sources and integrated optics lithium niobate electro-op...

We report an improved approach to generate optical triangular-shaped pulse train using quadrupling RF modulation and fiber dispersion-induced power fading. In the proposal, quadrupling RF modulation (via a dual-parallel Mach–Zehnder modulator) is employed to generate four primary optical sidebands (±2nd and ±6th) in spectrum. Then a piece of single mode fiber is connected as the dispersive medi...