We disclose herein an optical apparatus comprising an optical signal path which is driven by a plurality of electrical drivers. The electrical drivers are configured to optimize delays between two adjacent electrical drivers. The delays are optimized such that power loss in the optical apparatus is reduced.

Disclosed is a generator for generating an anti-Kerr modulated light signal, including a primary light source having four longitudinal modes or fewer and configured to generate a light signal and a modulator configured to modulate the power of the light signal by way of a square-wave or rectangular-wave control signal the duty cycle of which is less than or equal to 50%, and which are adapted such that the modulated light signal is periodic and has: at a first point of the signal, a first power value equal to the product of its average power and a gain between 1.6 and 2.4; at a second point of the signal, a second, non-zero power value, that is different from the first power value. Also disclosed is a modulation method and to a measuring device.

Devices, systems and methods for encoding information using optical components are described. An example photonic filtered sampler includes a spectral shaper configured to receive an optical pulse train, a dispersive element positioned to receive an output of the spectral shaper and to expand spectral contents thereof in time, and a modulator configured to receive an output of the dispersive element and a radio frequency (RF) signal, and to produce a modulated output optical signal in accordance with the RF signal. In this configuration, one or more characteristics of the modulated output optical signal is determined based on a spectral shape provided by the spectral shaper and dispersive properties of the dispersive element.

Systems and methods/processes for optical interferometric sensing using digitally enhanced interferometry (DI).

A pulsed light generation device includes: an optical coupler having four input/output ports including a first port, a second port, a third port and a fourth port; a connection optical path that connects the third port with the fourth port; and a phase modulation element disposed in the connection optical path. The optical coupler branches pulsed light input to the first port and outputs the branched input pulsed light as first-direction pulsed light and second-direction pulsed light to the third port and to the fourth port. The modulation element applies phase modulation to either one of the first-direction pulsed light and the second-direction pulsed light, thereby outputs output pulsed lights through the first port and the second port, wherein a waveform of one of the pulsed lights output through the first port is different from a waveform of the other of the output pulsed lights output through the second port.

We disclose herein an optical apparatus comprising an optical signal path which is driven by a plurality of electrical drivers. The electrical drivers are configured to optimise delays between two adjacent electrical drivers. The delays are optimised such that power loss in the optical apparatus is reduced.

Disclosed is an optical fiber interferometric system including a light source (1), a fiber optic coil (8), a coil splitter (3), a photodetector (2), and a polarization filtering unit. According to an embodiment, the polarization filtering unit includes a first waveguide polarizer (51), at least one second thin-plate polarizer (52) and an optical waveguide section (12), the at least one second polarizer (52) being disposed in the Rayleigh zone between a first waveguide end (21) of the first polarizer (51) and a second waveguide end (22) of the optical waveguide section (12).

Disclosed is an optical fiber interferometric system including a light source (1), a fiber optic coil (8), a coil splitter (3), a photodetector (2), and a polarization filtering unit. According to an embodiment, the polarization filtering unit includes a first waveguide polarizer (51), at least one second thin-plate polarizer (52) and an optical waveguide section (12), the at least one second polarizer (52) being disposed in the Rayleigh zone between a first waveguide end (21) of the first polarizer (51) and a second waveguide end (22) of the optical waveguide section (12).

An optical device capable of an ultrafast and large change of its reflection or absorption coefficient upon being excited by an ultrafast optical pulse with wavelength in the visible, near-infrared, or infrared spectral regions. The optical device includes, in sequential order, a first thick metallic layer, a first dielectric layer, a second thin metallic layer, and a second dielectric layer. The optical device acts as a nonlinear mirror that presents a large reflectance at low irradiance and a low reflectance at large irradiance. The optical device can further act as a nonlinear mirror that presents a linear and nonlinear reflectance with a large angular bandwidth.