The disclosed embodiments provide a method for tamper-proof protection of containers used for shipment of goods. An optical fiber is embedded in an Optical Shield Wallpaper which lines all interior surfaces of any size of a shipping container, package, box, barrel or other shaped container. Wallpaper is manufactured using large scale rollers that press fibers with encapsulated adhesives onto an appropriate medium. Small medicine containers are protected with a fiber optic shield and sensors manufactured using ink jet printing techniques. Light is applied to the optical fiber and a measurement of optical fiber characteristics is performed. Digital signal processing is used to generate pedigree information, which may include items such as shipping location, serial numbers and lot numbers for the goods. The status of the autonomous anti-tampering system is monitored real-time for unauthorized intrusions. Intrusions detected are relayed to an authorized recipient via a variety of communication channels.

Describe are an OPGW single wire torsional fatigue test method, apparatus and storage medium. The method includes: a preset torsional angle and preset cycle number of torsions of an OPGW single wire are acquired (S1); forward and backward torsional forces are sequentially and alternately applied to the OPGW single wire according to the preset torsional angle (S2); when a number of application times of the applied torsional forces reaches a preset cycle number of torsions, torsional force application to the OPGW single wire is stopped (S3). According to the test method, a bidirectional torsional fatigue test on the OPGW single wire may be made by sequentially and alternately applying the forward and backward torsional forces to the OPGW single wire, so that reliability of a test result and test efficiency are improved. In addition, a torsional force loading device is controlled by a control device of the test apparatus in the disclosure to make the bidirectional torsional fatigue test on the OPGW single wire, meanwhile, a unidirectional torsion test and a tensile test may further be made on it, and the apparatus is easy to operate and diversified in function.

The output profile of light from a multimode optical fiber is determined using a geometrical optics approach where the rays launched into the fiber conform to LP-modes of the fiber. This output profile can then be employed as an input to a second fiber to calculate the transmission losses of a coupler that introduces various coupling inaccuracies, such as lateral offset, axial offset, and angular offset.

The nondestructive determination of core size of a hollow-core photonic bandgap fiber (HC-PBF) using Fabry-Perot (FP) interference is performed with an apparatus including a tunable laser source (TLS), a 12 single-mode (SM) coupler, an SM collimator, a six-axis translation stage, an optical detector, and an oscilloscope. The light from the TLS passes through the 12 SM coupler and the SM collimator to perpendicularly enter two parallel air-SiO.sub.2 interfaces of the core of the fiber and is reflected, while the TLS is tuned from one wavelength to another. Then the reflected spectrum is guided to the optical detector, where its interference intensity is converted into voltage intensity to be displayed at the oscillator and fitted with a least-squares method to obtain the distance between the two air-SiO.sub.2 interfaces. The core size of the fiber can be obtained by rotating the fiber and repeating the procedure at multiple angular positions.

The present disclosure includes systems and methods for testing bundles of fiber optic fibers, such as fiber optic trunk cables, for correct polarity of connections at each end of the bundle of fibers while preventing the fiber optic fibers from contacting any other components during testing. The systems include a processor, a plurality of signal generators interfaced with a plurality of signal generator ports, a sensor interfaced with a sensor input port, a first selector switch, and a display, the processor operable to stimulate the plurality of signal generators one at a time in a first sequence to produce a signal, the first sequence based on a position of the first selector switch, the processor further operable to cause the display to display an output of the sensor.

An opto-mechanical fuse is provided. The opto-mechanical fuse includes a chassis component, an extrusion disposed on a monitored component proximate to the chassis component and a sensor. The sensor includes an optical conductor mounted to the chassis component to assume one of an optically transmitting state and an optically non-transmitting state in both power-on and power-off conditions. An assumption of the optically non-transmitting state by the optical conductor occurs due to an interaction of the optical conductor and the extrusion resulting from a predefined magnitude of deflection of the monitored component.

A method detects discontinuities in an optical channel using two laser units that respectively have a laser and an electroabsorption modulator. The reference frequencies of the two lasers have a predetermined reference frequency difference. The optical ports of the electroabsorption modulator are fed to the two inputs of a polarization beam splitter and the output of the polarization beam splitter is connected to the optical channel. A test pulse is applied simultaneously to the two electroabsorption modulators and laser light from the lasers is thus transmitted through the respective electroabsorption modulators during the time of the test pulse. The test pulse is divided into two time periods, and during the first time period the lasers are operated with their respective reference frequency, and during the second time period the emission frequencies of the lasers are detuned with respect to the reference frequencies, by a predetermined detuning frequency difference.

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.

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.

An optical adapter system may comprise a mounting plate. The mounting plate may include a set of magnets associated with: mechanically connecting the mounting plate and an optical adapter of the optical adapter system, and facilitating movement of the optical adapter between multiple positions associated with different optical fiber polishes. The optical adapter system may comprise the optical adapter. The optical adapter may include a set of structures associated with the set of magnets. The optical adapter may include an optical tip connector associated with mechanically connecting the optical adapter system and an optical cable.