Anritsu Corporation

Norio Nakayama

Shigeo Hori

Takashi Oshimi

Masaaki Tamakoshi

Yasuhiro Miyake

Yoshikazu Komatsu

Kiyosi Kimura

Keita Masuhara

Yoshifumi Imazu

Kiyoshi Iwasaki

In order to easily and efficiently carry out various characteristic evaluations of optical fibers which have been laid down, a table file which is for carrying out association of optical fibers serving as measuring objects with measured data when the optical fibers have been measured, based on optical fiber management information provided in advance of undertaking a cable laying/maintenance construction, such as various types of information on the optical fibers serving as measuring objects, and information on a construction site, and the like, is created at an external terminal. An OTDR measures the optical fibers serving as measuring objects based on the table file created at the external terminal, and stores measured result data in which the measured optical fibers and measured data of the optical fibers have been associated with one another, and edited result data expressing edited contents when the table file and the measured result data have been edited. The external terminal generates a report based on the measured result data and the edited result data stored in the OTDR.

Optical time domain reflectometer, and optical fiber measuring method and optical fiber measuring system using the same

A light pulse generator is connected with one end of an optical fiber which selectively emits light pulses of a plurality of wavelengths to the optical fiber. A photodetector outputs a signal corresponding to the strength of the light reflected from the optical fiber. A storage unit stores the signal output from the photodetector for each wavelength. A processor determines the position and characteristic of an event based on the waveform data for each wavelength stored in the storage device. A display device has first and second display areas. A display controller allows the first display area to display the waveform data for each wavelength stored in the storage unit in a discriminable manner, and allows the second display area to display a list of positions and characteristics of events for each wavelength determined by the processor.

OPTICAL TIME DOMAIN REFLECTOMETER WHICH MEASURES AN OPTICAL FIBER WITH DIFFERENT WAVELENGTHS ACCORDING TO AN ORDER AND COLLECTIVELY DISPLAYS WAVEFORM DATA AND A LIST OF EVENTS FOR EACH WAVEFORM IN THE SAME SCREEN

A measurement data display apparatus is provided which has an input section, a display, and a control section. The display displays a main screen showing fundamental measurement data of a measured object. In addition, responsive to an operation of a first key of the input section, the control section pops up on the main screen a secondary screen which simultaneously includes a plurality of large item menus relating to additional measurement data of the measured object, and a plurality of small item menus corresponding to each of the plurality of large item menus. Each of the plurality of small item menus are displayed at a position corresponding to each of a plurality of function keys of the input section, and the plurality of large item menus are enabled to be selected by operating a second key of the input section.

Measurement data display apparatus

An optical time domain reflectometer receives a return light of an optical pulse incident on a measurement target optical fiber formed out of a plurality of optical fibers coupled in series, and measures the splice loss, return loss and unit length loss of the measurement target optical fiber. A maximum value detector detects a maximum value due to an absolute value for the splice loss and maximum values for the return loss and the unit length loss of the measurement target optical fiber, respectively, in response to the return light. A display unit displays the maximum value due to the absolute value for the splice loss and the maximum values for the return loss and the unit length loss according to items of the splice loss, the return loss and the unit length loss based on output from the maximum value detector.

Evaluation apparatus for an optical fiber transmission line

Optical fiber monitor using optical time domain reflectometer and

A repositioner for a streaming magnetic tape drive apparatus includes control circuitry which, when a repositioning instruction is received from an external device, supplies a drive stop instruction to a tape reel motor and a measurement start instruction to a tape travel distance measuring device when a first data block edge detection signal is reproduced from the tape within a certain time period. A tape stop detection signal is produced when forward movement of the tape ceases, and the control circuitry outputs a reverse drive instruction to the reel motor while supplying a reverse tape travel distance measurement start instruction to the distance measuring device. When the forward and reverse tape travel distances become equal and a data block edge detection signal is reproduced from the tape within a certain time period, a normal operation signal is provided to the external device to signal that a repositioning operation is normally performed. Accordingly, adjacent data blocks on the tape will not be erased, and data read access will not be started midway along an adjacent data block on the tape.

Repositioner for streaming magnetic tape drive apparatus

A reel position-detecting device for use in a magnetic tape drive unit, designed to determine whether or not a supply reel has been positioned upside down in a retainer. When reel-detecting means detects that the supply reel has been set in the retainer, the retainer is rotated in the opposite direction to the tape-supply direction. If tape supply-detecting means detects the magnetic tape and then ceases to detect the tape within a predetermined period, processing means determines that the supply reel has been correctly positioned. Otherwise, the processing means determines that the supply reel has been positioned upside down.

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Atsugi, Japan

Norio Nakayama