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1. 发明专利

JP2002156586A VARIABLE WAVELENGTH OPTICAL FILTER 失效
公开(公告)号：JP2002156586A
公开(公告)日：2002-05-31
申请号：JP2000349133
申请日：2000-11-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： MORI KUNIHIKO , YOSHIDA EIJI , HASHIMOTO ETSU , KATAGIRI YOSHIMASA , MIZUKAMI MASAHITO
IPC分类号： G02B26/00 , G02B26/08
摘要： PROBLEM TO BE SOLVED: To provide a variable wavelength optical filter in which the selected wavelength can be changed at high speed. SOLUTION: The variable wavelength optical filter is equipped with N movable optical filters 1a, 1b,..., 1m,..., 1N which can be independently operated, and is constituted so that the m-th movable optical filter 1m has a passband centered at a wavelength λm when 1

2. 发明专利

JPH11121847A OPTICAL PULSE GENERATOR 失效
公开(公告)号：JPH11121847A
公开(公告)日：1999-04-30
申请号：JP28091497
申请日：1997-10-14
申请人： ANDO ELECTRIC , NIPPON TELEGRAPH & TELEPHONE
发明人： IIDA CHIKAHIRO , ICHIKAWA AKIO , KUMAGAI YOSHIHIRO , ASAHINA YUKA , NAKAZAWA MASATAKA , YOSHIDA EIJI
IPC分类号： H01S3/06 , H01S3/083 , H01S3/098 , H01S3/10 , H01S3/136
摘要： PROBLEM TO BE SOLVED: To provide an optical pulse generator, which generates an optical pulse train of a high repetition frequency very stably for a long time. SOLUTION: An optical path length adjusting device 14 for making a high- accuracy optical path length adjustment, and an optical path length adjusting device 60 for making a wide-ranging optical path length adjustment, are provided in an annular resonator R, an optical pulse which is emitted from the resonator R is converted into an electrical signal by a clock extractor 42 to extract a clock signal, a difference between the frequency of a reference frequency signal which is outputted from a synthesizer 52, and the frequency of the clock signal, is detected by a difference frequency detector 50, and the adjusting devices 14 and 60 are controlled according to this detected result.

3. 发明专利

JPH09219593A TEMPERATURE FLUCTUATION SUPPRESSOR 失效
公开(公告)号：JPH09219593A
公开(公告)日：1997-08-19
申请号：JP2443496
申请日：1996-02-09
申请人： ANDO ELECTRIC , NIPPON TELEGRAPH & TELEPHONE
发明人： ITO AKINARI , HOSODA TAKUYA , SATO NAOTO , NAKAZAWA MASATAKA , YOSHIDA EIJI
IPC分类号： H05K7/20
摘要： PROBLEM TO BE SOLVED: To provide a temperature fluctuation suppressor capable of stably sustaining the temperature of a stored item against the abrupt temperature fluctuation of the outside air. SOLUTION: A gelable medium 5 in large thermal capacity is stored in a metallic vessel 2 covered with an insulation body 1, furthermore, a metallic container 4 containing a stored item such as a part, etc., is insulated from the metallic vessel 2 by an insulation holder. Through these procedures, when the outside air temperature is abruptly fluctuated, the heat intruding into a device is firstly suppressed by the insulation body 1 further to be accumulated in the gelable medium 5. Accordingly, even in the case the outside air temperature is abruptly fluctuated, the temperature inside the metallic container 4 can be sustained at a constant level.

4. 发明专利

JPH08101411A LASER PULSE OSCILLATOR 失效
公开(公告)号：JPH08101411A
公开(公告)日：1996-04-16
申请号：JP23572594
申请日：1994-09-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , YOSHIDA EIJI
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/10 , H01S3/17 , H04B10/25 , H04B10/40 , H04B10/50 , H04B10/508 , H04B10/524 , H04B10/54 , H04B10/58 , H04B10/60 , H04B10/02 , H04B10/28
摘要： PURPOSE: To provide a laser pulse oscillator capable of easily generating short pulses of a certain specific repetitive frequency in higher harmonic forced mode synchronization. CONSTITUTION: This laser pulse oscillator consists of a looped rare earth added fiber 1 interposed with an optical coupler 3 for coupling exciting light and an optical branching device 4 for outputting light pulses. The laser pulse oscillator which outputs the light pulses of the repetitive frequency of integer times the basic frequency corresponding to the loop length of the rare earth added optical fiber 1 from the optical branching device 4 by higher harmonic mode synchronization is provided with an optical modulator 6 set with the modulation frequency so as to be made integer times the basic frequency and an optical modulator 10 set with the modulation frequency so as to be made integer times the modulation frequency of the optical modulator 6 on the rare earth added optical fiber 1. The light pulses of the repetitive frequency coinciding with the modulation frequency of the optical modulator 6 are outputted via the optical branching device 4.

5. 发明专利

JPH05102582A OPTICAL FIBER LASER DEVICE 失效
公开(公告)号：JPH05102582A
公开(公告)日：1993-04-23
申请号：JP26413691
申请日：1991-10-11
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA EIJI , NAKAZAWA MASATAKA
IPC分类号： G02F1/35 , H01S3/06 , H01S3/07 , H01S3/10
摘要： PURPOSE:To stabilize the repeating frequency of emitted ultrashort pulse beams by a method wherein a first optical fiber loop and a second optical fiber loop are coupled with each other and then a light modulating means is inserted into the second optical fiber so as to set up the modulation frequency in the value at the integer times of a resonator length. CONSTITUTION:The title optical fiber laser device 41 is composed of a second optical fiber loop 43 wherein a rapid light modulator (light modulating means) is inserted between an optical isolator 16 of a second optical fiber loop 3 of a passive mode synchronous rare earth doped optical film laser 1 and a polarization controller 17. The rapid light modulator 42 is inserted into the optical fiber laser device 41 so as to make the repeating frequency of femto second optical pulse beams constant. The amplified medium corresponding to the wave length is actualized by the various rare earth doped optical fiber 13 and an exciting light source 11 exciting the same. The repeating frequency of the emitted ultrashort pulse beams will be augmented up to the integer times of repetition decided by the length of a resonator to be stabilized thereby.

6. 发明专利

JP2001333016A OPTICAL WAVELENGTH MULTIPLEX TRANSMISSION SYSTEM 失效
公开(公告)号：JP2001333016A
公开(公告)日：2001-11-30
申请号：JP2000150077
申请日：2000-05-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA EIJI , KOGA MASABUMI
IPC分类号： H04B10/2507 , H04B10/07 , H04B10/2543 , H04J14/00 , H04J14/02 , H04L1/00 , H04L29/08 , H04B10/02 , H04B10/18
摘要： PROBLEM TO BE SOLVED: To suppress a nonlinear optical effect in an optical fiber transmission line and deterioration of a transmission characteristic in optical wavelength multiplex transmission in which two or more types of transmission speeds coexist. SOLUTION: An optical signal of a high transmission speed is subjected to wavelength multiplexing with strong intensity, and an optical signal of a low transmission speed is subjected to wavelength multiplexing with low intensity.

7. 发明专利

JPH0818139A LASER PULSE OSCILLATOR 失效
公开(公告)号：JPH0818139A
公开(公告)日：1996-01-19
申请号：JP14825194
申请日：1994-06-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , YOSHIDA EIJI
IPC分类号： H01S3/083 , H01S3/06 , H01S3/067 , H01S3/102 , H04B10/079 , H04B10/2507 , H04B10/291 , H04B10/508 , H04B10/516 , H04B10/524 , H04B10/54 , H04B10/588 , H04B10/61 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152
摘要： PURPOSE:To provide a laser pulse oscillator for generating extremely stabilized optical pulse in the higher repetitive frequency for a longe period of time. CONSTITUTION:In a harmonic mode synchronous laser pulse oscillator where the modulation frequency of an optical modulator 6 provided within a laser resonator is set to an integer multiple the basic frequency determined depending on the loop length of the laser resonator, a clock signal corresponding to the repetition frequency is extracted, by means of a clock extraction circuit 11 composed of a light receiving element and a narrow band filter, from a part of the output laser of such laser pulse oscillator and this clock signal drives an optical modulator 6.

8. 发明专利

JPH07318988A OPTICAL PULSE COMPRESSING DEVICE 失效
公开(公告)号：JPH07318988A
公开(公告)日：1995-12-08
申请号：JP11566294
申请日：1994-05-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , YOSHIDA EIJI
IPC分类号： G02F1/35
摘要： PURPOSE:To provide an optical pulse compressing device capable of remarkably shortening a pulse width when an incident light solution is compressed and freely controlling the pulse width. CONSTITUTION:By transmitting the incident light solution through a rare-earth added optical fiber 3 in which its group speed dispersion is set to a negative, an the absolute value of the group speed dispersion is reduced gradually from a start edge to an end edge where a beam is made incident along the advance direction of beam, light pulse compression by the reduction in a dispersion value is caused. On the other hand, an exciting light beam emitted from an exciting light source 4 is coupled in the incident end of the rare-earth added optical fiber 3 by a photocoupler 5, and by increasing the energy of the incident light solution, even thermal insulation compression is caused. Further, by adjusting the intensity of the exciting light beam emitted from the exciting light source 4, the pulse width of the compressed light solution is controlled freely.

9. 发明专利

JPH1041566A LASER PULSE OSCILLATOR 失效
公开(公告)号：JPH1041566A
公开(公告)日：1998-02-13
申请号：JP18939696
申请日：1996-07-18
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA EIJI , KUBOTA HIROKAZU , NAKAZAWA MASATAKA
IPC分类号： H01S3/07 , H01S3/06 , H01S3/083 , H01S3/10
摘要： PROBLEM TO BE SOLVED: To provide a laser pulse oscillator, which can stably generate a row of optical pulses equal in amplitude and an integer times as high as modulation frequency in repeat frequency, at a low price. SOLUTION: In a higher harmonic mode synchronous laser pulse generator, p units (p is an integer not less than 2) of light modulators 6, 10, and 11 are arranged within a resonator, and modulation frequencies to be applied to the several light modulators 6, 10, and 11 are set to f=(q±1/p) f0 or f=qf0 , and besides the phase difference between the modulation signal to be applied to the first light modulator 6 and the modulation signals to be applied to the second light modulator upward (m=2, 3,..., p) is set to 2π(m-1)/p. Hereby, a row of pulses equal in amplitude and besides p times as high as the modulation frequency in repeat frequency can be generated stably.

10. 发明专利

JPH09283824A LASER PULSE OSCILLATOR 失效
公开(公告)号：JPH09283824A
公开(公告)日：1997-10-31
申请号：JP9386396
申请日：1996-04-16
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YOSHIDA EIJI , NAKAZAWA MASATAKA
IPC分类号： H01S3/102 , H01S3/06 , H01S3/17
摘要： PROBLEM TO BE SOLVED: To provide at low cost a laser pulse oscillator capable of stably generating a train of optical pulses at a high repetition frequency over a response band of an optical modulator. SOLUTION: An optical modulator 6 in a laser oscillator is driven at a modulating frequency f equal to the multiple of a fundamental frequency qfo shifted by the fundamental frequency divided by a multiple of integer, f=(q+1/p)f0 to generate a train of optical pulses having a repetition frequency equal to the modulating frequency f multiplied by p. From a part of the laser output a clock signal having a higher frequency equal to the multiple of the fundamental frequency is extracted and the frequency f of this signal is divided by p into a frequency at which the optical oscillator 6 is driven to generate a train of optical pulses having a repetition frequency equal to its modulating frequency multiplied by p.

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