There is provided an optical-fiber connector endface inspection microscope system for inspecting an endface of an optical-fiber connector. It comprises one or more image detector for capturing at least one image of the endface to be inspected; an objective lens system comprising a focusing lens for adjusting a focus of the objective lens system on the image detector and a fixed relay lens; a main housing structure enclosing the image detector and the focusing lens; and at least one interchangeable optical head releasably connectable to the main housing structure and enclosing the fixed relay lens, wherein the optical head is releasably connectable to an adapter tip for interfacing with the optical-fiber connector to be inspected.

There are provided systems and methods for inspecting an endface of an optical-fiber connector using an optical-fiber connector endface inspection microscope system comprising one or more image detectors for capturing images over the whole endface to be inspected. An illumination system comprises two or more illumination sources disposed so as to illuminate respective regions over the connector endface and to prevent dark zones in the capture images. The illumination sources are activated in sequence, such that adjacent sources are never activated at the same time, and corresponding images captured in sequence, i.e., one after the other. In this case, it is also possible to activate the illumination sources in sequence, such that adjacent sources are never activated at the same time. Activating the illumination sources separately eliminates the illumination overlap and so eliminates the double image artifact. This allows for a more uniformly lit image with less dark spots.

An optical fiber unit includes an optical fiber. The optical fiber includes a light guiding region configured for guiding light through the optical fiber, an input coupling end having a first fiber end surface for coupling the light into the light guiding region, and an output coupling end having a second fiber end surface for coupling the light out of the light guiding region. The optical fiber unit further includes a first end piece arranged at one of the input coupling end and the output coupling end. The first end piece is configured to couple the light into the light guiding region or couple the light out of the light guiding region. The first end piece includes a reflection element configured to divert a portion of the light propagating along a direction of propagation through the light guiding region away from the direction of propagation.

A laser device includes at least one light source; a delivery fiber configured to propagate laser light launched from the light source; a monitor fiber optically coupled to the delivery fiber and configured to propagate a part of the light propagating in a direction opposite to a propagation direction of the laser light in the delivery fiber, and a light receiving unit configured to receive the light propagated by the monitor fiber. The light receiving unit is configured to detect first light included in a wavelength band of visible light.

An optical power meter unit includes a transmitting/receiving port configured to connect to a fiber under test. The optical power meter unit also includes a light source and an optical power meter. The optical power meter unit further includes an optical fiber extending between the transmitting/receiving port and the optical power meter. The optical fiber has a core size greater than a core size of the fiber under test.

An optical fiber state detection system includes: a first light source that outputs a monitor-related light for monitoring a state of an optical fiber; a reflection mechanism that reflects the monitor-related light propagated through the optical fiber; a light receiving part that receives a reflected light reflected by the reflection mechanism; a tap coupler provided between the reflection mechanism and both the first light source and the light receiving part such that the first light source and the light receiving part are connected the tap coupler; and a control part. Further, when the control part detects that a received optical power of the reflected light is greater than 0 and lower than a predetermined threshold value, the control part outputs information on a decrease in the received optical power to outside.

A testing device includes a test port, a light source, a measurement element, and a controller. A method of testing an optical system with the testing device includes, and/or the testing device is configured for, measuring an unloaded reference signal when the testing device is not connected to the optical system and storing the unloaded reference signal in a memory of the testing device. The method and/or configuration also includes detecting a signal from the optical system after storing the unloaded reference signal. Based on the detected signal, it is determined that the optical system is connected to a test port of the testing device. A test of the optical system with the testing device is automatically initiated in response to determining that the optical system is connected to the test port of the testing device.

An object of the present disclosure is to provide a power coupling coefficient measurement method and a power coupling coefficient measurement device capable of inexpensively and easily measuring a power coupling coefficient. The power coupling coefficient measurement method according to the present disclosure is a power coupling coefficient measurement method for measuring a power coupling coefficient of a multi-core fiber in order to achieve the aforementioned object, and includes: inputting a test light pulse from one end of the multi-core fiber to any one of cores; receiving backscattered light of the core to which the test light pulse is input or any one of the other cores; measuring an intensity distribution of the backscattered light with respect to a distance from the one end of the multi-core fiber; and calculating the power coupling coefficient from the intensity distribution of the backscattered light.

An object is to provide an optical fiber route search method, an optical fiber route search device, and a program that can efficiently confirm a path of an optical fiber that is installed over a long distance or across a large range. The optical fiber route search method according to the present invention carries out optical measurement that performs distributed measurement of the state of an optical fiber while applying a disturbance to the optical fiber in a portion in which wires of the optical fiber are parallel to each other, branch out, or intersect with each other (a proximity portion), and determines that the position in which the number of singularities (peaks or intensity fluctuations) fluctuates (becomes plural) is the position of the proximity portion from a distribution diagram obtained through the optical measurement.

Aspects of the disclosure provide for automated self-inspection by an OCT imaging engine or device, to identify and resolve failures or inefficiencies in the hardware and/or software of the system or device during imaging. An OCT imaging engine can include a catheter connection check system for checking the quality of a physical connection point between a catheter and other components of an OCT imaging device or system. In some examples, the OCT imaging engine includes a self-inspection engine implemented to perform routine self-inspection by using a reference reflector internal to the OCT imaging engine to generate system performance data. The OCT imaging engine can use the system performance data to periodically search for and resolve failures or inefficiencies in the system. The OCT imaging engine can perform a self-calibration process to perform k-linearization and/or correct for chromatic dispersion using mirror measurements collected from an internal reference reflector.