16 results about "Double-clad fiber" patented technology

A cladding light stripper and a manufacturing method therefor, and an optical fiber laser, relating to the technical field of cladding light strippers. The cladding light stripper (100) comprises a double-clad optical fiber assembly (1) and triple-clad bare fibers (2); the double-clad optical fiber assembly (1) comprises two sections of double-clad optical fibers (11), each double-clad optical fiber (11) comprises a double-clad bare fiber (111) and a coating layer (112) which are concentrically arranged in sequence from inside to outside, and the double-clad bare fiber (111) extends out of the coating layer (112); there are multiple sections of triple-clad bare fibers (2), the multiple sections of triple-clad bare fibers (2) are sequentially welded to form a main body (3), the two sections of double-clad optical fibers (11) are respectively welded to two ends of the main body (3) by means of the double-clad bare fibers (111), and a stripper is formed on the main body (3). The cladding light stripper (100) can be constructed from multiple sections of triple-clad bare fibers (2) while preserving the original advantages of the double-clad optical fibers (11) and the triple-clad bare fibers (2); this design can avoid the formation of local hot spots in any section of triple-clad bare fiber (2) due to prolonged high-power operation, thereby significantly improving the cladding light stripping ability of the cladding light stripper (100).

An all-fiber inline optical tap adopts a configuration of a side-pump signal-and-pump combiner with a double-clad fiber (DCF) and one or more multimode fibers (MMFs). DCF comprises a first cladding and a coupling portion, whereas each of MMFs comprises a taper portion fused around the coupling portion. MMFs are configured to extract a part of combined optical energy and a part of an optical signal leaking in the first cladding of DCF with a sampled optical power proportional to a fiber laser power in a propagating direction. By pre-selecting a proper taper slope of the taper portion and an embedded depth the MMFs fused and embedded in the coupling portion, the all-fiber inline optical tap can be built with a customized ratio used in fiber laser power monitoring, diagnostics, and controls of a fiber laser system.

The application discloses a bladder cancer diagnosis and treatment integrated system and a control method thereof, which comprises a swept-frequency OCT light source, a treatment laser, a wavelength division multiplexer, a double-clad optical fiber, a flexible scanning probe, an endoscope imaging unit and an intelligent image processing and control terminal; imaging light and treatment laser are transmitted in a common light path by using the double-clad optical fiber, and scanning and light beam control are completed by means of a double-axis MEMS micro-mirror. The control method obtains tomographic structure information and depth information by reconstructing OCT data, and controls treatment laser power, galvanometer deflection and laser pause, recovery or stop by combining distance calculation, displacement compensation and blood perfusion monitoring, and is suitable for imaging navigation and closed-loop treatment in bladder cancer surgery.

Methods and systems for delivering power over an optical fiber are provided. In embodiments, light carrying optical power is provided by the optical fiber to a tapered fiber-bundle divider (TFBD), where the light is then divided into branches. In some embodiments, each branch is directed to a respective, further TFBD, where that branch is divided into subsequent branches. Electrical power is generated from each subsequent branch. In some embodiments, the light carries an optical signal, and a signal branch is created by the initial TFBD. In some of these embodiments, a multimode coupler is used to extract optical power from the signal branch. In some embodiments, each branch is matched to an electrical load according to the power generated from that branch and the power requirements of the electrical load. In some embodiments, an all-glass double-clad fiber or a triple-clad fiber is used to provide light.

The multi-module integrated low-fusion-point optical fiber amplifier has the advantages of being compact in structure, high in reliability and good in thermal management performance, a plurality of optical devices with adjacent functions are integrated into sub-modules through the micro-optical patch packaging technology, no optical fiber fusion points exist in the modules, and the optical fiber fusion points are integrated into the sub-modules. Insertion loss, reflection echoes and potential fault points are effectively reduced, and the stability and long-term reliability of an optical path are improved; meanwhile, the compact layout of the optical path of the integrated module is directly combined with a heat dissipation substrate, so that the concentrated heat flow design and heat management are facilitated, local overheating is avoided, and stable output of the high-power erbium-ytterbium-doped double-clad optical fiber is supported; in addition, the module can complete alignment and light path packaging through precise surface mounting in a factory, can complete performance calibration before leaving a factory, and only needs a small number of external interfaces for connection during field installation, thereby reducing the manufacturing and maintenance cost, and improving the yield and consistency.

Systems disclosed herein are directed to optical terminals configured for free space communication comprising at least one lens collector assembly comprising a lens and a dual clad fiber optic coupler attached to the at least one lens, and a transceiver operably connected to the at least one lens collector assembly.

The application relates to the field of high-power fiber lasers, and particularly discloses a femtosecond laser preparation method of a pump light recycling grating and a spectrum measuring device. The preparation method takes a double-clad fiber as a substrate, adopts femtosecond laser to be focused in the inner cladding through a coating layer, writes a fiber Bragg grating through a multi-layer line scanning technology, prepares a uniform grating or a chirped grating, and flexibly controls a grating modulation area by adjusting parameters. The spectrum measuring device is composed of an ASE broadband light source, a multimode fiber coupler, a multimode fiber matched with the inner cladding diameter and a double spectrometer, and realizes real-time and accurate measurement of the transmission and reflection spectrum of the inner cladding grating. The application solves the problems of low coupling efficiency, poor reliability and difficulty in reflecting specific wavelengths in the traditional pump light recycling technology, the prepared grating is uniform in modulation, the pump light reflection effect is good, residual pump light can be recycled efficiently, and the system efficiency and integration level of the high-power fiber laser are significantly improved.

An optical metrology device simultaneously performs confocal and non-confocal Raman spectroscopy. The optical metrology device includes a double-clad fiber with a core that acts as a confocal pinhole to receive the confocal signal from the Raman response while simultaneously receiving the non-confocal signal from the Raman response over the inner cladding and core of the double-clad fiber. A spectrometer receives the Raman response via the double-clad fiber to detect the confocal spectroscopic signal from the core and to detect the non-confocal spectroscopic signal from the inner cladding and the core.

The invention provides a coherent laser fiber coupler comprising a pulse continuous coherent beam combination structure which is a porous capillary tube, a plurality of fiber bundles are inserted into the porous capillary tube, and the plurality of fiber bundles are fused, formed and cut in an output end taper area; one end of the square hollow optical fiber output system is welded with the optical fiber bundle, and a square hollow energy transmission optical fiber is adopted in the square hollow optical fiber output system for coupling shaping output. A pulse continuous coherent beam combination structure and a square hollow optical fiber output system are adopted, and through the pulse continuous coherent beam combination structure, center pulse (continuous) signal double-clad optical fiber time domain coherent disturbance, surrounding continuous (pulse) double-clad optical fiber space coherence, multi-path ultrahigh-power continuous laser beam phase interference and power recombination are achieved. Through the square hollow optical fiber output system, multi-path signals are output in a high-power continuous coupling space in a same-phase mode, and the spatial coherent coupling output efficiency and reliability are effectively improved.

This invention provides a 980nm fiber laser based on co-pumping by an oscillator and an amplifier, comprising a pump source, an oscillator, a filter element, and a second ytterbium-doped double-clad fiber. The oscillator includes a high-reflectivity fiber grating, a first ytterbium-doped double-clad fiber, and a low-reflectivity fiber grating. The high-reflectivity fiber grating and the low-reflectivity fiber grating together form a resonant cavity. The first ytterbium-doped double-clad fiber, located within the resonant cavity, receives the pump light and generates 980nm signal light through stimulated emission. By designing an optical path structure for co-pumping by the oscillator and amplifier, and utilizing the filter element to filter out 1030nm light while allowing residual pump light to enter the subsequent amplification stage, the unabsorbed residual pump energy in the oscillator is reused. This significantly simplifies the system size and reduces costs while solving the core problems of severe pump energy waste and low optical-to-optical conversion efficiency in existing technologies.

An optical metrology device simultaneously performs confocal and non-confocal Raman spectroscopy. The optical metrology device includes a double-clad fiber with a core that acts as a confocal pinhole to receive the confocal signal from the Raman response while simultaneously receiving the non-confocal signal from the Raman response over the inner cladding and core of the double-clad fiber. A spectrometer receives the Raman response via the double-clad fiber to detect the confocal spectroscopic signal from the core and to detect the non-confocal spectroscopic signal from the inner cladding and the core.

The application discloses a preparation device of a double-clad optical fiber preform, which comprises a bottom die assembly and a cylindrical die vertically extending and having both ends open; an outer cladding glass sleeve matched with the internal structure of the cylindrical die is detachably installed in the cylindrical die, the outer cladding glass sleeve has both ends open, the inside of the outer cladding glass sleeve is used for extruding and filling inner cladding glass melt, and a top die is arranged in the cylindrical die and is butted at the top end of the outer cladding glass sleeve; a first feeding channel for allowing fiber core glass melt to flow and be absorbed into the inner cladding glass is formed in the top die, and the bottom end of the first feeding channel is provided with a discharge port coaxially communicated with the outer cladding glass sleeve; the bottom die assembly is used for plugging the bottom end of the outer cladding glass sleeve, and the bottom die assembly is provided with a cooling mechanism matched with the inner cladding glass cooling, so that the double-clad optical fiber preform with ideal interface, good fiber core diameter uniformity and wide adjustable range of fiber core / cladding ratio can be obtained.

The application provides a kind of energy and signal integration device based on double-clad optical fiber and use method, comprising: communication transmitting end, high-power laser transmitting end, double-clad optical fiber, photovoltaic converter, communication receiving end and sensing receiving end, wherein: communication transmitting end is connected with communication receiving end through the core of double-clad optical fiber, respectively for completing the transmission and receiving demodulation of communication optical signal;High-power laser transmitting end is connected with photovoltaic converter through the inner cladding of double-clad optical fiber, respectively for completing the sending and receiving conversion of energy optical signal;Sensing receiving end is used for detecting and demodulating the Rayleigh scattering light signal returned from the disturbance position of optical fiber, so as to obtain the disturbance position;Energy optical signal and communication optical signal are transmitted through inner cladding and core respectively, reducing the mutual interference between energy optical signal and communication optical signal, and sensing and positioning the disturbance of optical fiber, so as to realize the integration of energy optical signal transmission, communication optical signal transmission and sensing.

The utility model discloses a retina fluorescence imaging device, and relates to the technical field of imaging. The retina fluorescence imaging device comprises a light source detection module and a light beam scanning module, the light source detection module comprises a first light source module, a first detection module and a first optical fiber, and the first optical fiber comprises a first double-clad optical fiber and a first coupling optical fiber; excitation light generated by the first light source module is transmitted through a fiber core of the first double-clad optical fiber, enters the light beam scanning module, enters an eyeball after being modulated by the light beam scanning module, and excites a fluorescent light beam formed by a retina to enter the light source detection module through the light beam scanning module. And the optical signal is transmitted to the first detection module through the first cladding of the first double-cladding optical fiber and the first coupling optical fiber and is used for fluorescence imaging, so that the aim of optimizing the retina fluorescence imaging device is fulfilled.

According to one aspect of the present disclosure for achieving the above-described object, a multimodal imaging catheter inserted into the body to acquire information of an internal body tissue for achieving the above-described object is disclosed. The multimodal imaging catheter may include an imaging core including a double clad fiber and a focusing device, the imaging core transfers light to the internal body tissue and collects information within the internal body tissue; and an imaging sheath including the imaging core therein to protect the imaging core from an external environment and to separate the internal body tissue and the imaging core during an imaging operation of the multimodal imaging catheter for the internal body tissue.

This invention discloses a device, method, and testing method for preparing cladding mode stripping samples of double-clad optical fibers. The device features a groove bent along a smooth path. The sample preparation method includes the following steps: taking a double-clad optical fiber to be tested; using a predetermined length of the beginning of the double-clad fiber as a cladding mode stripping segment; and bending the cladding mode stripping segment along a predetermined smooth path to form a pre-fabricated test sample. The testing method includes the following steps: preparation of the cladding mode stripped sample; and light injection testing. This invention cleanly strips the cladding mode from the test sample prepared from the optical fiber to be tested, rather than from the testing device end. Thus, while ensuring the accuracy of the test results, cladding mode stripping and light injection testing are separated into two completely independent steps, executed simultaneously in parallel. This makes the test results more accurate and unaffected by the cladding mode, while also improving the test efficiency.