At least some embodiments of disclosure provide a method and device for optical fiber monitoring and an optical fiber adapter. The method includes: a device for monitoring the optical fiber for performing optical fiber monitoring is installed in an optical fiber adapter and the optical fiber monitoring is performed by using the optical fiber adapter with the device for monitoring the optical fiber. The problem that the device for monitoring the optical fiber has complex wiring and a deployment position is limited is solved. And effects that the wiring complexity of the device for monitoring the optical fiber is reduced, and the deployment position is flexible and convenient are achieved.

A fiber inspection system for inspecting optical-fiber endfaces of a multiple-fiber connector is provided that includes a housing structure, a mating interface fixed relative to the housing structure for interfacing with the multiple-fiber connector, and an imaging assembly. The imaging assembly is enclosed in the housing structure and defines an inspection plane and an image plane, at least a plurality of the optical-fiber endfaces being disposed on the inspection plane, to within a focusing range, when the multiple-fiber connector is mated to the mating interface. The imaging assembly also defines an imaging axis between an inspection point on the inspection plane and a detection point on the image plane, and includes an alignment module disposed between the inspection plane and the image plane and controllable to move the inspection point across the inspection plane for selectively inspecting one or more of the optical-fiber endfaces.

A system and method for evaluating individual Fiber Bragg Grating (FBG) sensors in a multiplexed acoustic sensor system, the system comprising: a broadband pulsed source; a circulator that passes a laser pulse to a multiplexed series of N FBG sensors and one reference Fresnel reflector, wherein said circulator also receives a return N+1 reflection pulse train from the N FBG sensors and one reference Fresnel reflector; and an optical switch that receives the return N+1 reflection pulse train from the N FBG sensors and one reference Fresnel reflector.

Using pump-probe measurements on multi-span optical links may result in the determination of one or more of the following: 1) wavelength-dependent power profile and gain evolution along the optical link; 2) wavelength-dependent dispersion map; and 3) location of regions of high polarization-dependent loss (PDL) and polarization-mode dispersion (PMD). Such measurements may be a useful diagnostic for maintenance and upgrade activities on deployed cables as well as for commissioning new cables.

A method of calibrating a collimating lens system includes transmitting, using an optical transmitter, a beam out of an optical fiber and through a collimating lens of the collimating lens system. The beam is reflected off a perfect flat mirror positioned at an output of the collimating lens and back towards the collimating lens, and received, via the collimating lens, at a power meter connected to the optical fiber. The method also includes adjusting a position of a tip of the optical fiber proximal to the collimating lens while tracking a power reading using the power meter, selecting a calibration position of the optical fiber corresponding to a highest power reading, and securing the optical fiber relative to the collimating lens using the calibration position.

The optical fiber sensing method according to the present disclosure includes: sensing optical fibers being redundantly laid (10A1, 10A2); an execution unit (22) that executes sensing with the sensing optical fibers (10A1, 10A2); a detection unit (23) that detects occurrence of a fault in the sensing optical fiber (10A1) of an active system among the sensing optical fibers (10A1, 10A2); and a switching unit (21) that performs switching in such a way that the execution unit (22) executes sensing with the sensing optical fiber (10A2) of a standby system among the sensing optical fibers (10A1, 10A2) when the detection unit (23) detects occurrence of a fault.

Aspects of the present disclosure describe distributed fiber optic sensing (DFOS) systems, methods, and structures that advantageously extend DFOS techniques to anomaly detection using optical magnetism switches (OMC) that are integrated into the DFOS system.

An optical fibre assembly comprises a hollow core optical waveguide comprising a hollow core surrounded by a structured arrangement of longitudinally extending capillaries providing an inner cladding surrounded by an outer cladding; a diagnostic solid core optical waveguide comprising a solid core surrounded by a cladding, and extending substantially parallel to the hollow core optical waveguide; and a jacket surrounding both the hollow core optical waveguide and the solid core optical waveguide and forming a common mechanical environment for the hollow core optical waveguide and the solid core optical waveguide. The optical fibre assembly may be or may comprise or be included in an optical fibre cable, and may be used in a method for testing hollow core optical waveguides.

An optical fiber monitoring system includes an optical fiber including a plurality of cores, in which a pair of cores are designated as a core pair from among the plurality of cores, and to which a plurality of the core pairs are allocated, and a remote monitoring device that acquires a monitoring result indicating a state of the optical fiber by use of monitoring light for each of the core pairs, wherein the remote monitoring device acquires, according to a first monitoring result being the monitoring result of a first core pair included in the plurality of core pairs, a second monitoring result indicating a state of a second core pair being another core pair.

According to one implementation a central venous catheter is provided that includes an end emitting optical fiber that is configured to end emit bacterial disinfecting light to disinfect a conduit located inside the hub, the conduit connecting the working lumen of an infusion shaft with a working lumen of a main shaft.