Embodiments relate to a noise suppressor for suppressing noise of an optical signal, including a core through which the optical signal travels, a clad that is wrapped around the core and configured to expose part of the core, and a graphene layer formed on the part of the core, and a digital optical signal generation system including the same.

A system includes a processor communicatively coupled to an Amplifier Stimulated Emission (ASE) source and an optical receiver, wherein the processor is configured to cause transmission of one or more shaped ASE signals, from the ASE source, on an optical fiber, obtain received spectrum of the one or more shaped ASE signals from the optical receiver connected to the optical fiber, and characterize the optical fiber based in part on a nonlinear skirt and/or center dip depth in the received spectrum of the one or more shaped ASE signals. The one or more shaped ASE signals can be formed by the ASE source communicatively coupled to a Wavelength Selective Switch (WSS) that is configured to shape ASE from the ASE source to form the one or more shaped ASE signals with one or two or multiple peaks and with associated frequency.

An apparatus includes a laser system that includes a first fiber having an output end and situated to propagate a first laser beam with a first beam parameter product (bpp) and a second fiber having an input end spliced to the output end of the first fiber at a fiber splice so as to receive the first laser beam and to form a second laser beam having a second bpp that is greater than the first bpp, wherein the output end of the first fiber and the input end of the second fiber are spliced at a tilt angle so as to increase the first bpp to the second bpp.

An electro-optical modulator (EOM) array that simultaneously modulates a plurality of optical beams. The EOM array has particular application for use in a seed beam source for an SBC fiber laser amplifier system, where the seed beam source includes a plurality of master oscillators each providing an optical seed beam at a different wavelength on a fiber. The EOM array has a common substrate, a plurality of parallel waveguides and an electrode structure, where each waveguide is coupled to one of the fibers to receive one of the seed beams. An RF source provides an RF drive signal to the electrode structure that modulates the seed beams. The fiber laser amplifier system amplifies each of the seed beams from the EOM array, and includes an SBC grating that spatially combines the amplified beams at the different wavelengths so that they are directed in the same direction as an output beam.

The present disclosure relates to a fiber encapsulation mechanism for energy dissipation in a fiber amplifying system. One example embodiment includes an optical fiber amplifier. The optical fiber amplifier includes an optical fiber that includes a gain medium, as well as a polymer layer that at least partially surrounds the optical fiber. The polymer layer is optically transparent. In addition, the optical fiber amplifier includes a pump source. Optical pumping by the pump source amplifies optical signals in the optical fiber and generates excess heat and excess photons. The optical fiber amplifier additionally includes a heatsink layer disposed adjacent to the polymer layer. The heatsink layer conducts the excess heat away from the optical fiber. Further, the optical fiber amplifier includes an optically transparent layer disposed adjacent to the polymer layer. The optically transparent layer transmits the excess photons away from the optical fiber.

A fiber amplifier system including a plurality of seed beam sources each generating a seed beam at a different wavelength and a plurality of fiber amplifiers that amplify the seed beams. The system also includes a spectral beam combining (SBC) grating that spatially combines the amplified beams and directs them in the same direction as an output beam, and a first fiber sampler and a second fiber sampler that generate a first fiber sample beam having a first intensity and a second fiber sample beam having a second intensity. The system further includes a configuration of optical and electrical feedback components that determine a difference between the first intensity and the second intensity and use the difference to control the wavelength of all of the seed beams so that all of the amplified beams are spatially aligned and propagating in the same direction in the output beam.

A method for generating amplified laser radiation includes generating a forward-propagating laser beam in a first waveguiding gain stage, amplifying the forward-propagating laser beam in a second waveguiding gain stage, and directing the forward-propagating laser beam from an output waveguide of the first waveguiding gain stage to an input waveguide of the second waveguiding gain stage via a propagation path passing through a Kerr medium. The Kerr medium suppresses coupling, between the first and second waveguiding gain stages, of high-peak-power laser radiation exceeding a threshold intensity in the Kerr medium. Self-focusing in the Kerr medium causes a majority of the high-peak-power laser radiation to be outside at least one of an acceptance aperture and an acceptance angle of a receiving one of the output waveguide of the first waveguiding gain stage and the input waveguide of the second waveguiding gain stage. Each waveguiding gain stage may include a gain fiber.

A transmission device includes an input/output unit that inputs or outputs an optical signal, and an optical amplifier that amplifies the optical signal passing through an optical fiber by excitation light. The optical amplifier includes a fiber-bundle set that includes a plurality of fiber bundles each formed by winding the optical fiber, and a plate-shaped heating member that has one surface along which the fiber bundles are arranged, and the fiber bundles have mutually different winding radii and are concentrically arranged on the surface of the plate-shaped heating member.

A combiner, that optically combines input fibers that propagate pumping light launched from pumping light sources and a relay fiber connected to an amplification fiber, includes: a bundle portion where the input fibers are bundled together; and a melting portion where the input fibers are melted and integrated together. In an interface between the relay fiber and the melting portion, the input fibers are fused together without a gap between the input fibers.

A pulsed laser device includes: a semiconductor laser device that outputs laser light having a single wavelength; a semiconductor optical amplifier that receives the laser light output from the semiconductor laser device and amplifies the laser light to output; and a semiconductor-optical-amplifier driver that supplies a pulse-modulated semiconductor-optical-amplifier driving current to the semiconductor optical amplifier.