In some examples, fiber optic cable location may include transmitting a coherent laser pulse into a device under test (DUT). Based on an analysis of reflected light resulting from the transmitted coherent laser pulse, changes in intensity of the reflected light caused by a plurality of signals directed towards the DUT may be determined. Further, based on the changes in intensity of the reflected light, a location of the DUT may be determined.

A light physical constant measurement method includes: virtually dividing an optical transmission medium along a propagation direction to set a plurality of first segments; and estimating light physical constants of the plurality of first segments based on the result of a first propagation simulation that uses a model in which an input optical signal of each of the plurality of intensities propagates sequentially through the plurality of first segments, and in the estimating of light physical constants of the plurality of first segments, the light physical constants of the plurality of first segments are searched for using an evaluation function of evaluating a difference between a measured power spectrum of an output optical signal and a power spectrum of the output optical signal obtained as a result of the first propagation simulation, to estimate the light physical constants of the plurality of first segments.

There is provided a system and a test instrument for identifying or verifying the fiber arrangement and/or the cable type of multi-fiber array cables (such as MPO cables) which employs a light source and a polarity detector at the near end of the multi-fiber array cable under test, and a loopback device at the far end. The polarity detector comprises light presence detectors used to detect which one of the optical fibers of the multi-fiber array cable returns light looped back at the far end and thereby determine the fiber arrangement and/or the cable type of the multi-fiber array cable.

A compact optical time domain reflectometer (OTDR) containing a small-scale OTDR, power source, and wireless communications electronics encompassed within the confines of a spool containing a time delay fiber optic waveguide coiled about the face of the spool. Data obtained by the OTDR is transmitted by wire or wirelessly to a computer or portable wireless device for graphical plotting of said data and evaluation by the user. The integration of the time delay waveguide eliminates the need for a separate time delay waveguide and provides a more compact testing solution. The Compact OTDR with Integrated Time Delay is used to test the integrity of an optical fiber waveguide.

A composite connector for optical power meter is provided, which includes a fixation base and an active connection base. The fixation base is installed on an optical power meter; the fixation base includes a left hole, a right hole and a central hole. The active connection base includes a bottom plate, an active pin, a first fiber socket and a second fiber socket. The first fiber socket and the second fiber socket are disposed on the bottom plate. The active pin penetrates through the bottom plate and is inserted into the left hole, whereby a first circle, whose center is at the active pin and circumference passes through the first fiber socket as well as the second fiber socket, overlaps a second circle, whose center is at the left hole and circumference passes through the central hole, in the normal direction of the active connection base.

The disclosed technology includes, among others, methods and devices for measuring distributed fiber bend or stress related characteristics along an optical path of fiber under test (FUT) uses both a light input unit and a light output unit connected to the FUT at one single end.

An Optical Time Domain Reflectometer (OTDR) tests an optical fiber by generating, transmitting, and receiving light signals from an optical fiber. The OTDR generates light signals having different characteristics and stitches these light signals into an OTDR trace. Backscatter and properties such as dynamic range effect the quality of the OTDR trace.

One or more embodiments are directed to optical test instruments, such as fiber optic inspection scopes and optical power meters, for testing optical communication links, such as fiber optic connectors. The optical test instruments include a single test port that is able to operate in two modes of operation. In a first mode of operation, the optical test instrument is configured to provide an image of the endface of a fiber optic connector under test. In a second mode of operation, the optical test instrument is configured to measure power or power loss in an optical fiber under test. In that regard, the fiber optic connector only has to be coupled to a single port of an optical test instrument for a visual inspection of an endface of a fiber optic connector and a power test of the optical fiber under test.

Systems and methods are disclosed for dynamic addressing of optical fiber sensors in fiber optic interferometry systems. Events that occur along the optical fiber span have defining attributes such as location along the optical fiber span, type, magnitude, time of occurrence, and duration. The event attributes may be used to dynamically form a unique address that fully defines and identifies the event. Other information, such as the corresponding identifier for one or more of the optical fiber span and the corresponding fiber optic interrogator may be included as part of the unique address.

A transmitter generates a first electrical signal comprising a first low-frequency signal, an empty period, and a pump pulse having a first frequency; and a second electrical signal comprising a second low-frequency signal and at least two probe pulses, each probe pulse having a second frequency that differs from the first frequency. The transmitter modulates first and second optical subcarriers having different polarizations using the first and second electrical signals, respectively. The transmitter generates an optical signal from the first and second optical subcarriers, wherein the first and second low-frequency signals overlap in time, wherein the empty period overlaps in time with one of the probe pulses, and wherein the pump pulse overlaps in time with another one of the probe pulses. The optical signal is detected at a receiver over an optical link, and the receiver uses the optical signal to estimate nonlinear phase shift in the optical link.