Abstract: A source of femtosecond pulses at center wavelengths of about 940 nm and about 1140 nanometers (nm) includes a mode-locked fiber MOPA delivering pulses having a center wavelength of about 1040 nm. The 1040-nanometer pulses are spectrally spread into a continuum spectrum extending in range between about 900 nm and about 1200 nm and having well defined side-lobes around the 940-nm and 1140-wavelengths. Radiation is spatially selected from these side-lobes and delivered as the 940-nm and 1140-nm pulses.

Abstract: A source of optical supercontinuum radiation comprises a length of microstructured optical fiber and a pump laser adapted to generate lasing radiation at a pump wavelength. The length of microstructured optical fiber is arranged to receive lasing radiation at the pump wavelength to generate optical supercontinuum radiation and comprises a core region and a cladding region which surrounds the core region.

Abstract: A fiber optic geometric isolator is disclosed which is inserted between two cascaded, high-power fiber optic lasers and, in conjunction with a cladding mode stripper, provides improved optical Isolation between the two fiber optic lasers while maintaining highly-efficient laser operation. The isolator achieves this without the need for electromagnetic isolation between the two cascaded lasers. The isolator is an optical fiber designed to operate as a monolithic, continuous waveguide to enable a specific mode-coupling condition that converts the light of a first laser to that of a second, cascaded laser, with the light moving from the core of the first laser to both the core and the cladding of the second laser.

Abstract: A high brightness diode laser package includes a plurality of flared laser oscillator waveguides arranged on a stepped surface to emit respective laser beams in one or more emission directions, a plurality of optical components situated to receive the laser beams from the plurality of flared laser oscillator waveguides and to provide the beams in a closely packed relationship, and an optical fiber optically coupled to the closely packed beams for coupling the laser beams out of the diode laser package.

Abstract: A method for example of irradiating a light-curable material, may comprise irradiating light about a first axis from an array of light-emitting elements towards a light-curable surface, directing the irradiated light through an optical element interposed between the array of light-emitting elements and the light-curable surface, wherein a central axis of the optical element is offset from the first axis, and deflecting the irradiated light directed through the optical element asymmetrically away from the first axis towards the light-curable surface.

Abstract: Optical fiber combiner includes a plurality of input optical fibers having a core and a cladding surrounding the core, a bridge fiber having a portion that transmits a light beam entered from each of the input optical fibers, and a glass member fusion-spliced to an end face of the cladding and to a first end face of the bridge fiber. The end portions of the claddings of the plurality of input optical fibers are bundled on at least a first end face side, with the adjacent side surfaces of the claddings being in contact with each other. The glass member has an outer diameter greater than the diameter of the core and smaller than the outer diameter of the cladding. The adjacent glass members are in a non-fusion-spliced state.

Abstract: A super-continuum system including: a fiber laser configured to output a pulse having a center wavelength; a first nonlinear waveguide configured to shift the wavelength of the pulse from the fiber laser; a first fiber amplifier of at least one stage configured to amplify the output from the first nonlinear waveguide; and a second nonlinear waveguide configured to spectrally broaden the output from the first fiber amplifier.

Abstract: A microwave-frequency source, generating an output electrical signal at an output frequency fM, comprises a pump laser source, an optical resonator, and a photodetector. Free spectral range vFSR of the optical resonator equals an integer submultiple of a Brillouin shift frequency vB of the optical resonator (i.e., vB=MvFSR). The pump laser source is frequency-locked to a corresponding resonant optical mode of the optical resonator. Pumping the optical resonator with output of the pump laser source at a pump frequency vpump results in stimulated Brillouin laser oscillation in the optical resonator at respective first, second, and third Stokes Brillouin-shifted frequencies v1=vpump?vB, v2=vpump?2vB, and v3=vpump?3vB. The photodetector receives stimulated Brillouin laser outputs at the first and third Stokes Brillouin-shifted frequencies v1 and v3 and generates therefrom the output electrical signal at a beat frequency fM=v1?v3=2vB.

Abstract: A laser utilizes a cavity design which allows the stable generation of high peak power pulses from mode-locked multi-mode fiber lasers, greatly extending the peak power limits of conventional mode-locked single-mode fiber lasers. Mode-locking may be induced by insertion of a saturable absorber into the cavity and by inserting one or more mode-filters to ensure the oscillation of the fundamental mode in the multi-mode fiber. The probability of damage of the absorber may be minimized by the insertion of an additional semiconductor optical power limiter into the cavity.

Abstract: A composite optical waveguide is constructed using an array of waveguide cores, in which one core is tapered to a larger dimension, so that all the cores are used as a composite input port, and the one larger core is used as an output port. In addition, transverse couplers can be fabricated in a similar fashion. The waveguide cores are preferably made of SiN. In some cases, a layer of SiN which is provided as an etch stop is used as at least one of the waveguide cores. The waveguide cores can be spaced away from a semiconductor layer so as to minimize loses.

Abstract: A laser utilizes a cavity design which allows the stable generation of high peak power pulses from mode-locked multi-mode fiber lasers, greatly extending the peak power limits of conventional mode-locked single-mode fiber lasers. Mode-locking may be induced by insertion of a saturable absorber into the cavity and by inserting one or more mode-filters to ensure the oscillation of the fundamental mode in the multi-mode fiber. The probability of damage of the absorber may be minimized by the insertion of an additional semiconductor optical power limiter into the cavity.

Abstract: The disclosed embodiments provide systems and methods for mitigating lensing and scattering as an optical fiber is being inscribed with a grating. The disclosed systems and methods mitigate the lensing phenomenon by surrounding an optical fiber with an index-matching material that is held in a vessel with an integrated interferometer (e.g., phase mask, etc.). The index-matching material has a refractive index that is sufficient to reduce intensity variations of the actinic radiation within the optical fiber. Some embodiments of the system include different vessels for holding the index-matching material, with the vessel having an interferometer integrated into the vessel. These vessels permit the optical fiber to be surrounded by the index-matching material while the gratings are written to the optical fiber.

Abstract: A dual wavelength pumping system and method have been developed to improve the efficiency of laser systems operating in the raid infrared region has been developed, in a conventional system the ions are excited from a ground state to an upper lasing state using a light pump. They then undergo a laser transition to leave the ion in a long lived post lasing excited state from which it eventually decays back to the ground state. In contrast they present system uses a first light pump to pump ions from the ground state to the post lasing state, and a second light pump to pump ions from the post lasing state to the upper lasing state. This system thus exploits the long lifetime of the post lasing state to enable it to become a virtual ground state for the second laser allowing continued cycling of ions between the upper lasing state and the post lasing state. A system using an Erbium, doped fiber generated a 3.5 ?m laser output with an average power of over 250 mW and an initial slope, efficiency of 25.

Abstract: An optical fiber assembly includes at least one optical component configured to deliver light from a first end to a second end opposite the first end. The at least one optical component includes at least one localized heat-sensitive area that emits increased temperatures with respect to remaining areas of the at least one optical fiber in response to light traveling through the localized heat-sensitive area. The optical fiber assembly further includes a nanoparticle heat sink that contacts the optical component and that completely surrounds the localized heat-sensitive area such that the nanoparticle heat sink dissipates heat from the at least one optical component.

Abstract: A light source module of an optical apparatus is disclosed. The light source module includes a laser pump unit, a lens unit, and a fiber unit. The laser pump unit generates a laser source. The lens unit converts the laser source into a condensed beam. The fiber unit receives the condensed beam and emits an optical signal. The light source module can achieve effects of low cost, large bandwidth, high resolution, and high stability with well-designed pump power of the laser pump unit, and length, doping material, and core size of the fiber unit.

Abstract: A method and system for updating physical location data associated with a VoIP endpoint device is implemented in a variety of embodiments. In one such embodiment, a VoIP endpoint device stores an identifier for a packet-communicating device which is subject to changing. The VoIP endpoint device has an interface for communication over the Internet via the packet-communicating device and uses a circuit-implemented method for prompting a VoIP user to update physical location data associated with the VoIP endpoint device. In response to a power state transition and a change in the stored identifier, the VoIP endpoint device facilitates an update to the physical location data associated with the VoIP service.

Abstract: Described are embodiments of apparatuses and systems including a hybrid laser including anti-resonant waveguides, and methods for making such apparatuses and systems. A hybrid laser apparatus may include a first semiconductor region including an active region of one or more layers of semiconductor materials from group III, group IV, or group V semiconductor, and a second semiconductor region coupled with the first semiconductor region and having an optical waveguide, a first trench disposed on a first side of the optical waveguide, and a second trench disposed on a second side, opposite the first side, of the optical waveguide. Other embodiments may be described and/or claimed.

Abstract: A mode-locked fiber MOPA delivers pulses of laser-radiation. A super-continuum generator including a bulk spectral-broadening element and a negative group-delay dispersion (NGDD) device is arranged to receive a pulse from the MOPA and cause the pulse to make a predetermined number of sequential interactions with the broadening element and the NGDD device. After making the predetermined interactions, the pulse is delivered from the super-continuum generator with a very broad spectral-bandwidth and a very short duration.

Abstract: A hybrid external cavity multi-wavelength laser using a QD RSOA and a silicon photonics chip is demonstrated. Four lasing modes at 2 nm spacing and less than 3 dB power non-uniformity were observed, with over 20 mW of total output power. Each lasing peak can be successfully modulated at 10 Gb/s. At 10?9 BER, the receiver power penalty is less than 2.6 dB compared to a conventional commercial laser. An expected application is the provision of a comb laser source for WDM transmission in optical interconnection systems.

Abstract: The present invention relates to a pulse laser device, and more particularly, to a pulse laser device which can be operated in a burst mode, in which the output of a low-output laser generator is adjusted so as to enable the uniform control of the profile of the peak output of a final output optical pulse train, and in a variable burst mode, in which the profile of the final output optical pulse train can be controlled into an arbitrary waveform.

Abstract: A clad absorber unit is provided on a passive fiber of a high power fiber laser system and operative to trap and remove high order modes propagating along the clad of the passive fiber. The mode absorber has a composition made from one or more liquid metals and alloys thereof which are placed in the opening formed in the sheath of the passive fiber. The composition is configured to remove from the cladding the MM light having a predetermined light power which heats the composition at a temperature lower than a threshold temperature at which the absorber may be damaged.

Abstract: The refractive index of the first core portion 11a is higher than that of a clad 12, and the refractive index of the second core portion 11b is higher than that of the first core portion 11a. When light of the LP01 mode and light of the LP11 mode are standardized by power, in the core 11, an active element that stimulates to emit light of the predetermined wavelength is doped at a higher concentration in at least a part of an area where power of light of the LP01 mode is larger than that of light of the LP11 mode than at least a part of an area where the power of light of the LP11 mode is larger than that of light of the LP01 mode.

Abstract: A laser beam-combining optical device according to the present invention includes a plurality of semiconductor laser arrays, and a reflective element that reflects a laser light beam emitted from at least one semiconductor laser array of the plurality of semiconductor laser arrays. When laser light beams emitted from respective ones of the plurality of semiconductor laser arrays are focused on a single focus point, the laser light beam emitted from the at least one semiconductor laser array is reflected by the reflective element, and is then focused on the focus point.

Abstract: The invention relates to sources of sub-picosecond optical pulses based on single-pass or double-pass optical amplifiers with an optical gain bandwidth in the 2-20 nm range. A passive pulse shaping filter is provided in front of the optical amplifier for pre-shaping seed optical pulses so as to passively pre-compensate for the gain narrowing effect in the optical amplifier. The passive pulse shaping filter may be based on a reflective thin film filter, which may be coupled to a mirror in a multi-pass configuration.

Abstract: A fiber optic connector for use with a fiber optic network having at least one predetermined operating wavelength is provided. First housing contains at least one optical fiber. The optical fiber has a free end forming a physical contact. The physical contact is coated with a protective film. The optical thickness of the protective film is at least 0.10 of the operating wavelength of the fiber optic network. Preferably, the physical contact is thermally shaped. Also preferably, the optical fiber is attached to a quick connect device forming a termini. The physical contact of the optical fiber can be readily coated with the protective film by placing the termini in a vacuum chamber.

Abstract: Systems and methods for reducing cost and amplifier module size are disclosed. One system comprises an arrayed optical fiber amplifier that uses a ribbonized fiber that permits reduction of amplifier module size and also reduction in the cost of manufacturing that are not readily achievable in other currently-available systems.

Abstract: A current Ii supplied to a pumping light source 20 is detected and time-averaged with a predetermined time constant to calculate a time-averaged current Iav. An optical output power Pi outputted from an amplifying optical fiber 12 is detected and time-averaged with the predetermined time constant to calculate a time-averaged optical output power Pav. A reference optical output power Pr and a reference current Ir supplied to the pumping light source 20 when the reference optical output power Pr is outputted from an optical fiber laser apparatus 1 are used to calculate an optical output power expectation value Pex=Iav×Pr/Ir. The time-averaged optical output power Pav and the optical output power expectation value Pex are compared with each other to determine a decrease of an optical output power of the optical amplifier apparatus 1 based on the comparison result.

Abstract: An optical switch includes a microresonator comprising a silicon-rich silicon oxide layer and a plurality of silicon nanoparticles within the silicon-rich silicon oxide layer. The microresonator further includes an optical coupler optically coupled to the microresonator and configured to be optically coupled to a signal source. The microresonator is configured to receive signal light having a signal wavelength, and at least a portion of the microresonator is responsive to the signal light by undergoing a refractive index change at the signal wavelength. The optical switch further includes an optical coupler optically coupled to the microresonator and configured to be optically coupled to a signal source. The optical coupler transmits the signal light from the signal source to the microresonator.

Abstract: A method and apparatus for launching optical pump signals into a disordered gain medium at two points thereby producing a narrow line-width random fiber laser within the disordered gain medium. The optical pump signals are propagated in a direction through the disordered gain medium towards one another. The apparatus may comprise an optical gain fiber having a first end configured to receive a first fiber pump signal and a second end configured to receive a second fiber pump signal such that the first fiber pump signal and the second fiber pump signal propagate within the optical gain fiber in a direction towards one another. An optical loss device is coupled to the optical gain fiber, wherein the optical loss device isolates a narrow line-width random fiber laser signal from a signal generated within the optical gain fiber.

Abstract: A laser device includes an optical fiber laser unit including an amplification optical fiber, a plurality of pumping light sources outputting pumping lights for optically pumping the amplification optical fiber, and a controller controlling the pumping light sources. When an instruction value for supplying a predetermined driving electric current to each of the pumping light sources is input to the controller, the controller conducts a control of supplying a compensated electric current value as a driving electric current obtained by multiplying an initial electric current value corresponding to the instruction value by a compensation coefficient and supplying the compensated electric current value to each of the pumping light sources. The compensation coefficient is set to restrain a decrease in a power with time of a laser light output from the optical fiber laser unit.

Abstract: A reinforcing fiber for reinforcing a transparent matrix composite. The fiber includes a substantially transparent fiber ribbon having an elongated cross-sectional geometry. The fiber ribbon includes edges that are substantially opaque. Light is substantially prevented from passing through the opaque edges to reduce or eliminate light distortion through the fiber. A composite utilizing the reinforcing fibers and a method for making a window assembly and a method for manufacturing a vehicle are also disclosed.

Abstract: A dynamic tunable chromatic dispersion compensator with low latency is provided that includes a chirped fiber Bragg grating in a compensating optical fiber core. The chirped fiber Bragg grating includes wavelength gratings spaced at distances varying with respect to the length of the compensating optical fiber core to compensate for differential delay in a synchronous time protocol for a bidirectional computer data communication link. The dynamic tunable chromatic dispersion compensator also includes one or more controllable elements to modify the length of the compensating optical fiber core in response to one or more commands, and an optical junction to optically couple the chirped fiber Bragg grating to an optical fiber of the bidirectional computer data communication link.

Abstract: High aspect ratio core optical fiber designs, which could be semi-guiding, including a core region having a first refractive index and a high aspect ratio elongated cross-section along a slow axis direction, are described. An internal cladding having a second refractive index sandwiches the core and acts as a fast-axis signal cladding. The core has an edge region at both of its short edges that is in contract with edge-cladding regions having a barbell shape. The refractive index of the core regions, the refractive index of the internal claddings, and the refractive index of the edge-cladding regions, are selected so as to maximize the optical power of a lowest-order mode propagating in the fiber core, and to minimize the optical power of the next-order modes in the fiber core. A process to fabricate such a high aspect ratio core fiber is also provided.

Abstract: A laser therapy method and apparatus is disclosed. The optical coherence property of the therapy laser is actively controlled to provide optimum therapy results for difference types of biological tissue and body parts.

Abstract: A method of forming an optically variable security device is provided. In the method, a photonic crystal material is provided and a process is performed upon the material which causes deformation of the material so as to form a first region (A) for which incident light received by the crystal material is selectively reflected or transmitted to generate a first optically variable effect, and a second region (B) for which incident light received generates an optical effect, different from the first optically variable effect. Corresponding devices having first and second regions are also disclosed.

Abstract: A broadband light source (e.g., an optical supercontinuum apparatus), can comprise a pump laser; a non-linear optical element configured for generating spectrally broadened light generated responsive to receiving pump laser pulses and one or more non-linear processes; an optical output for delivering spectrally broadened light to a target; a length of optical waveguide optically upstream of the output and in optical communication therewith; and a sensor apparatus. The length of optical waveguide can comprise at least a first waveguiding region configured for propagating spectrally broadened light in a forward direction toward the output and can be further configured for receiving backward propagating light responsive to the forward propagating light. The sensor apparatus can be configured for optical communication with the length of optical waveguide so as to sense the backward propagating light propagated by the length of optical waveguide.

Abstract: According to the invention, the intermediate sheath (13) is formed by assembling longitudinal elements (13A) and includes: a first optical material, the refractive index of which differs from the refractive index of the monomode core by at most 10?3; and a second optical material, the refractive index of which is lower than the refractive index of said monomode core and differs therefrom by at least 10?3.

Abstract: A laser includes an optical fiber having two ends of which a first end is configured to receive light therethrough, and a doped section configured to absorb at least part of the light received by the first end and for emitting light. The laser further includes a heat-conducting material which coats at least the doped section of the optical fiber.

Abstract: An optical transmission medium includes: a plurality of cores; a first cladding that covers each of the plurality of cores; a second cladding that covers a plurality of first claddings; and a reflection layer that covers the second cladding and has reflection characteristics with respect to a wavelength band of multimode light.

Abstract: A method and apparatus for producing single mode random fiber ring laser by inducing random distributed feedback in a short section of the fiber ring to thereby enable single mode lasing while reducing frequency jitter and relative intensity noise. The random distributed feedback maybe achieved through deep refractive index modulation at a series of randomly distributed laser-irradiated points inscribed along the length of the induced random distributed feedback fiber. The laser-processed random distributed feedback fiber maybe incorporated into the fiber ring in conjunction with a variable optical attenuator and band pass optical filter for enhancing the single mode operation.

Abstract: A tunable laser has a first mirror, a second mirror, a gain medium, and a directional coupler. The first mirror and the second mirror form an optical resonator. The gain medium and the directional coupler are, at least partially, in an optical path of the optical resonator. The first mirror and the second mirror comprise binary super gratings. Both the first mirror and the second mirror have high reflectivity. The directional coupler provides an output coupler for the tunable laser.

Abstract: Compact high brightness light sources for the mid and far IR spectral region, and exemplary applications are disclosed based on passively mode locked Tm fiber comb lasers. In at least one embodiment the coherence of the comb sources is increased in a system utilizing an amplified single-frequency laser to pump the Tm fiber comb laser. The optical bandwidth generated by the passively mode locked Tm fiber comb laser is further decreased by using simultaneous 2nd and 3rd order dispersion compensation using either appropriate chirped fiber Bragg gratings for dispersion compensation, or fibers with appropriately selected values of 2nd and 3rd order dispersion. Fibers with large anomalous values of third order dispersion, or fibers with large numerical apertures, for example fibers having air-holes formed in the fiber cladding may be utilized.

Abstract: The first cladding 52 has a two-layer structure formed of a solid inner layer 62A passed through the center axis of the first cladding 52 and an outer layer 62B enclosing the inner layer 62A and the plurality of cores 51 with no gap. A refractive index n1 of the core 51 is provided higher than refractive indexes n2A and n2B of the inner layer 62A and the outer layer 62B, the refractive indexes n2A and n2B of the inner layer 62A and the outer layer 62B are provided higher than a refractive index n3 of the second cladding 53, and the refractive index n2A of the inner layer 62A is provided lower than the refractive index n2B of the outer layer 62B.

Abstract: A pulse light source device for creating fs output pulses, includes a driver source device including a ps laser pulse source for creating a ps laser pulse output, a first beam splitting device for splitting the ps laser pulse output to first and second ps driver pulses, a first spectral broadening device for creating first fs driver pulses by spectrally broadening the first ps driver pulses, an optical parametric amplifier (OPA) device for creating CEP stabilized second fs driver pulses, and for seeding on the basis of the first fs driver pulses and pumping with the second ps driver pulses, wherein the second fs driver pulses include idler pulses of the OPA device, and a second spectral broadening device for creating the fs output pulses, and arranged to be driven on the basis of the second fs driver pulses. Furthermore, a method of creating fs output pulses is described.

Abstract: A method includes accumulating optical pump power in a first laser gain medium during a first period of time, where the first laser gain medium is optically located within a resonator. The method also includes providing at least some of the accumulated optical pump power as a first laser output with a feedback-controlled waveform from the first laser gain medium to a second laser gain medium during a second period of time, where the second period of time is substantially shorter than the first period of time. The method further includes generating a second laser output having a burst of laser pulses using the second laser gain medium as a power amplifier. The first and second laser outputs have higher power levels during the second period of time compared to a power level of the optical pump power during the first period of time.

Abstract: A method and passive device for the coherent combination of two amplified and/or spectrally broadened optical beams using at least one bidirectional optical component (A1, A2), the device includes an amplitude division ring interferometer having optical splitting and recombining elements disposed so as to receive an incident optical beam (S0) and to split it spatially into a first secondary input beam (H1) and a second secondary input beam (H2), optical guiding elements disposed so as to define an optical path in the form of a ring in the interferometer, the at least one bidirectional optical component being disposed on the optical path of the ring interferometer, the splitting and recombining elements being disposed in such a way as to receive and to recombine spatially, temporally and coherently the first secondary output beam (H1?) and the second secondary output beam (H2?), so as to form a coherent output beam.

Abstract: A fiber amplifier is disclosed having a core region embedded within a cladding. The core region further has multiple sections, each of which is doped with at least one rare-earth ion.

Abstract: A source of optical supercontinuum radiation comprises a length of microstructured optical fiber and a pump laser, the pump laser adapted to generate lasing radiation having a pump wavelength in the wavelength range of 900 nm to 1200 nm for generating an optical supercontinuum, the length of microstructured optical fibre comprising a core region having a diameter in the range of 1 ?m to 5 ?m and a cladding region which surrounds the core region; the cladding region comprising at least two capillary air holes having substantially the same diameter and which extend substantially along the length of the fibre; the fiber comprising a zero dispersion wavelength within ±200 nm of said pump wavelength; wherein the length of microstructured fiber can support a plurality of modes at said pump wavelength; and wherein said lasing radiation at said pump wavelength is launched into said core region of said length of microstructured optical fiber to excite the fundamental mode of the fiber.

Abstract: A high brightness diode laser package includes a plurality of flared laser oscillator waveguides arranged on a stepped surface to emit respective laser beams in one or more emission directions, a plurality of optical components situated to receive the laser beams from the plurality of flared laser oscillator waveguides and to provide the beams in a closely packed relationship, and an optical fiber optically coupled to the closely packed beams for coupling the laser beams out of the diode laser package.

Abstract: A laser device including lasing materials composed of nanoparticles in an aerosol phase. One example is Nd2O3 in DMDCS with DMSO which is sprayed into a cuvette, measures have to be taken to prevent for aggregation. The fluorescence life-time is significantly shorter compared to nanoparticles dissolved in a liquid.