A waveguide, in particular an optical fiber, is coated and is of flexible configuration so that the waveguide can be laid in an adaptable manner, wherein the coating includes a light-frequency-converting substance so that in the event of UV light or IR light being coupled into the waveguide and an overbent waveguide, visible light escapes from the waveguide at a bend point.

The present invention relates to a method and device for measuring optical nonlinearity of an optical fiber to be measured comprising a plurality of cores having mutually coupled waveguide modes. The method includes, at least, preparing a laser light source emitting laser light and a detecting unit determining an optical intensity, inputting laser light into a specific core of the optical fiber to be measured, determining the intensity of a specific wavelength component caused by optical nonlinearity among the reflective light components from the optical fiber to be measured, and determining optical nonlinearity of the optical fiber to be measured on the basis of the intensity of the specific wavelength component.

A screening apparatus for an optical fiber includes a delivery unit that delivers an optical fiber; a screening unit that applies tension to the delivered optical fiber to perform screening of the optical fiber; a winding unit that winds the optical fiber after screening; and a static electricity removing unit that removes static electricity of the optical fiber traveling on the predetermined passage, the static electricity removing unit being disposed along a predetermined passage of a passage of the optical fiber from an exit side of the screening unit to an entry side of the winding unit.

The invention relates to a method for controlling rotation of a winding spool onto which an optical fiber is wound in a proof-testing machine. The optical fiber is guided in the proof-testing machine at a given line speed from an input pulling device to an output pulling device and then to the spool. The input and output pulling device is arranged to subject the optical fiber to a predetermined tensile stress. The method includes upon detection of a break between an output point (A) of the input pulling device and between an input point (B) of the output pulling device, a step of controlling the rotational speed of the spool to bring it to a complete stop; and a step of passing the optical fiber between an output point (C) of the output pulling device and an input point (D) of the winding spool in a fiber accumulation zone adapted to accumulate a predetermined fiber length preventing an fiber broken end resulting from the break going beyond the input point (D) of the winding spool.

Disclosed are an apparatus for measuring a displacement using a fiber Bragg grating sensor, which is applied to a strain sensor using the fiber Bragg grating sensor, and a method of controlling sensitivity and durability of the same. The apparatus includes: a case forming an external appearance; third and fourth optical fibers having mutually different numbers of strands and installed in the case while being spaced apart from each other by a predetermined interval; and a connection unit installed between the third and fourth optical fibers and fixed at a predetermined position by tension applied to the third and fourth optical fibers, wherein the fiber Bragg grating sensor is installed to one selected from the pair of optical fibers having mutually different numbers of strands, so that measurement sensitivity and durability are controllable.

There is provided an optical-fiber connector endface inspection microscope system comprising optical power measurement capability, wherein optical power measurement is provided via an optical power meter device implemented within an extension unit positioned along an optical path between the inspected optical-fiber connector endface and the optical-fiber connector endface inspection microscope, i.e. between the inspected optical-fiber connector endface and objective optics of the optical-fiber connector endface inspection microscope.

According to examples, a fiber-optic testing source for testing a multi-fiber cable may include a laser source communicatively coupled to a plurality of optical fibers connected to a connector. The fiber-optic testing source may include at least one photodiode communicatively coupled to at least one of the plurality of optical fibers by at least one corresponding splitter to implement a communication channel between the fiber-optic testing source and a fiber-optic testing receiver. The communication channel may be operable independently from a polarity associated with the multi-fiber cable. The fiber-optic testing receiver may include a plurality of photodiodes communicatively coupled to a plurality of optical fibers. The fiber-optic testing receiver may include at least one laser source communicatively coupled to at least one of the plurality of optical fibers by at least one corresponding splitter to implement the communication channel between the fiber-optic testing receiver and a fiber-optic testing source.

A verification apparatus is provided. The verification apparatus includes: an acquisition unit configured to acquire a photographed image of an optical line for which a splicing operation is completed; an analysis unit configured to extract a defect of a spliced portion of the optical line through analysis of the image; and a determination unit configured to determine the presence or absence of an abnormality in the spliced portion based on the extracted defect.

A microscope may receive a fiber optic connector via a connector adapter of the microscope, wherein the connector adapter includes an opening and a shaped reflective surface surrounding the opening. The microscope may align a ferrule of the fiber optic connector with the opening of the connector adapter of the microscope, wherein the ferrule includes a ferrule chamfer or a ferrule radius. The microscope may transmit direct light onto the shaped reflective surface and may receive reflected light from the ferrule chamfer or the ferrule radius and with a camera of the microscope.

The invention relates to an apparatus (1) for tensile testing of an optical fiber (11). In order to efficiently and simply test the optical fiber, the apparatus comprises a dual pulley (6) with a first circumferential surface (7) having a first diameter (D1) and with a second circumferential surface (8) having a second diameter (D2) which is larger than the first diameter (D1). A fiber inlet (10) which is delimited by the first circumferential surface (7) and the first drive belt section (2) contacts the first circumferential surface (7). A fiber outlet (13) which is delimited by the second circumferential surface (8) and the second drive belt section (3) contacts the second circumferential surface (8), and a guide (12) passes the optical fiber (11) from the fiber inlet (10) to the fiber outlet (13).