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    METHOD OF CHARACTERIZING BISTABLE SEMICONDUCTOR LASER
    71.
    发明专利
    METHOD OF CHARACTERIZING BISTABLE SEMICONDUCTOR LASER 失效

    公开(公告)号：JPH0277665A

    公开(公告)日：1990-03-16

    申请号：JP12168189

    申请日：1989-05-17

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： KARUBUANI RITSUKARUDO ,  KAPONI RENAATO

    IPC: G01R31/26 ,  G02F3/02 ,  H01S5/00 ,  H01S5/042 ,  H01S5/06 ,  H01S5/50

    Abstract: PURPOSE: To measure the nonlinear refractive index coefficient of a bistable semiconductor laser by utilizing the laser indicated by the intensity of the laser light emitted from the laser as the function of the intensity of input light and a hysteresis loop and, at the same time, to completely optically characterize the laser. CONSTITUTION: A laser beam emitted from a laser 3 is transmitted to an acoustooptical device 6 on a amplitude-modulated carrier through an insulating device 5. The beam 6 coming out from the device 6 is sent to a beam splitter 8 and the beam transmitted through the splitter 8 is optically amplified after the beam is sent to a laser 1, collected by means of a photodetector 9, again amplified 10, and inputted to an oscilloscope 11. The beam reflected by the splitter 8 is collected by another photodetector 12, amplified 13, and inputted to the oscilloscope 11. Therefore, the transmission hysteresis loop of the laser 1 is established. A data processor 14 discriminates the switching point between two states and calculates not only the nonlinear refractive index coefficient of the laser, but also other parameters, such as the wavelength difference between discharged signals and pump signals, etc., characteristically indicating the laser.

    ELECTRO-OPTIC DEFELECTOR
    72.
    发明专利
    ELECTRO-OPTIC DEFELECTOR 失效

    公开(公告)号：JPH0264619A

    公开(公告)日：1990-03-05

    申请号：JP17176189

    申请日：1989-07-03

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： JIYORUJIYO GUREGO

    IPC: G02F1/225 ,  G02F1/29 ,  G02F1/295

    Abstract: PURPOSE: To make it possible to refract guided and paralleled rays at an angle of several tins degree while the parallelism is maintained by providing the deflector with parallel bands having the refractive index increasing proportionally. CONSTITUTION: Electric conductors C are individually connected and the electrodes E formed in parallel and at equal intervals are adhered to the plane of a plate P. The plane perpendicular to the plane inclusive of the electrodes enables the input of parallel rays LE to guides. Another plane parallel with the plane enables the output of refractive rays LU. The respective conductors C are connected to a voltage source which has the value to enable the generation of the voltage within the crystals of the parallel regions having different refractive indices. The arrangement of the optical paths of the different equiv. lengths forming phase gratings is obtd. The parallel rays LE are fed in the phase grating in the direction parallel with the electrodes and the phase of the optical fronts of parallel rays Lu emitted from the electricaly obtd. slits is controlled and the positive interference in the desired directions is generated. The voltages impressed on the electrodes are controllable by a microprocessor so as to supply the most convenient value which is the function of the necessary reflective angle.

    REDUCTION IN ATTENUATION FOR OPTICAL FIBER
    73.
    发明专利
    REDUCTION IN ATTENUATION FOR OPTICAL FIBER 失效

    公开(公告)号：JPH01142607A

    公开(公告)日：1989-06-05

    申请号：JP25962188

    申请日：1988-10-17

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： PIETORO DEI BUITA

    IPC: G02B6/00 ,  C03B37/14 ,  C03B37/15 ,  G02B6/02

    Abstract: PURPOSE: To shift a minimum attenuation point to a minimum dispersion area without requiring a complicated production work by reducing a heterogenous area in materials of an optical fiber. CONSTITUTION: The optical fiber is oscillated with a superaudible frequency, which brings about rearrangement of atoms to a lower energy state, to reduce the heterogenous area in materials of the optical fiber. This external stress is, for example, oscillation with the super-audible frequency applied for several minutes and is realized with a simple device, namely, a furnace where the fiber is heated up to a desired temperature and an ultrasonic generator which oscillates the fiber. Thus, attenuation due to Rayleigh scattering is reduced by relaxation induced in the molecular structure.

    DISTRIBUTION TEMPERATURE SENSOR
    74.
    发明专利
    DISTRIBUTION TEMPERATURE SENSOR 失效

    公开(公告)号：JPS63140927A

    公开(公告)日：1988-06-13

    申请号：JP28967687

    申请日：1987-11-18

    Applicant: CSELT CENTRO STUDI LAB TELECOM

    Inventor： JIORUJIO GUREGO

    IPC: G01K11/00 ,  G01J5/08 ,  G01J5/10 ,  G01K11/12 ,  G01K11/32

    Abstract: The distributed temperature sensor employs an optical fibre (1) as sensing element located in an ambient or near a body of which the temperature is to be monitored or measured. A source (3) of light pulses sends into the fibre pulses of predetermined duration. The backscattered radiation is collected for each pulse and the frequency spectrum variations in the backscattered radiation with respect to the incident radiation are analyzed. A computing means obtains the temperature from said variations. The source (3) and the spectrum variation analyzing means (9) are part of an optical time domain reflectometer which allows the temperature information to be associated with the information on the position of the backscattering point along the fibre.

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