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1. 发明专利

JP2002314489A OPTICAL NETWORK SYSTEM 失效
公开(公告)号：JP2002314489A
公开(公告)日：2002-10-25
申请号：JP2001112746
申请日：2001-04-11
申请人： FUJITSU LTD
发明人： NAKAJIMA KAORU , GOTO MASAMI , KOYANO HIDENORI
IPC分类号： H04B10/00 , H04B10/2513 , H04B10/2575 , H04B10/516 , H04B10/61 , H04W88/08 , H04W88/14 , H04W92/12 , H04B10/24 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152 , H04Q7/36
摘要： PROBLEM TO BE SOLVED: To provide an optical network system where a base station unit generates a downlink wireless communication signal independently of the length of an optical transmission optical fiber and a frequency generated by a local oscillator in the center unit. SOLUTION: In the optical network system provided with the center unit 10, the base station unit 30, and a mobile station 50, a wireless transmission section of the base station unit 30 is provided with an optical filter 301 that passes a frequency corresponding to a wavelength of consecutive light and frequency higher than the frequency corresponding to the wavelength of the consecutive light by a frequency of the downlink wireless signal, and an uplink optical reception section of the center unit 10 is provided with an optical filter 18 that passes a frequency higher than the frequency corresponding to the wavelength of the consecutive light by the frequency of the uplink wireless communication signal.

2. 发明专利

JPH11242129A PROCESSING METHOD AND CONNECTING METHOD OF PLASTIC OPTICAL FIBER 失效
公开(公告)号：JPH11242129A
公开(公告)日：1999-09-07
申请号：JP4525798
申请日：1998-02-26
申请人： FUJITSU LTD , ASAHI GLASS CO LTD , KOIKE YASUHIRO
发明人： NAKAJIMA KAORU , GOTO MASAMI , TAKANO YOSHINOBU , YOSHIHARA NORIYUKI , KOIKE YASUHIRO
IPC分类号： G02B6/255 , G02B6/02
摘要： PROBLEM TO BE SOLVED: To easily and permanently connect the end faces of plastic optical fibers with low loss by dissolving the top end of an optical fiber with a volatile solvent to form a smooth recess on the end face of the optical fiber. SOLUTION: This plastic optical fiber is a graded refractive index plastic optical fiber having the refractive index gradually decreased from the center axis to the peripheral part. The top end of the optical fiber 22 is dipped in a volatile solvent 36 housed in a container 34. Namely, the top end of the plastic optical fiber which is cut with a cutting tool is dipped and etched in the volatile solvent to form a recess on the end face. When the plastic optical fiber 22 consists of a fluorine-contg. polymer, the volatile solvent 36 is preferably a fluorine-contg. org. solvent. By dipping the top end of the plastic optical fiber 22 in the solvent for one min, the end face can be flattened while the shape as cut is maintained.

3. 发明专利

JPH10336119A OPTICAL TRANSMITTER-RECEIVER, OPTICAL SIGNAL TRANSMISSION METHOD IN BIDIRECTIONAL OPTICAL COMMUNICATION SYSTEM AND BIDIRECTIONAL OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JPH10336119A
公开(公告)日：1998-12-18
申请号：JP14675397
申请日：1997-06-04
申请人： FUJITSU LTD
发明人： GOTO MASAMI , KOYANO HIDENORI , NAKAJIMA KAORU
IPC分类号： H04B10/00 , H04B10/548 , H04B10/24
摘要： PROBLEM TO BE SOLVED: To maintain a satisfactory communication quality in an optical transmitter-receiver and also to perform bidirectional (simultaneous) communication of bit rates of up/down signals in an almost symmetrical data rate, while controlling cost increase at the time of system configuration. SOLUTION: This optical transmitter-receiver 20 sends an optical signal to an opposite device 23 connected through a transmission fiber 24 and also receives a modulated optical signal that is modulated by using light energy of an optical signal from the device 23 through the fiber 24. In such cases, the device 20 is provided with an encoded optical signal outputting part 21 which outputs an optical signal with encoded data and a light receiving part 22 which receives a modulated optical signal from the device 23, wherein the part 21 outputs such an encoded optical signal as to make the data rate of an optical signal coming from the device 23 closer to the data rate of an optical signal toward the device 23, while maintaining a communication quality.

4. 发明专利

JPH095586A OPTICAL DEVICE 失效
公开(公告)号：JPH095586A
公开(公告)日：1997-01-10
申请号：JP15914195
申请日：1995-06-26
申请人： FUJITSU LTD
发明人： TABUCHI HARUHIKO , NORIZUKI MASUMI , GOTO MASAMI
IPC分类号： G02B6/26 , G02B6/30 , G02B6/42
摘要： PURPOSE: To improve the degree of freedom in terms of the accuracy of alignment between optical components and the adjustment of optical axis height in an optical device where plural optical components are aligned. CONSTITUTION: A guide groove 26 in which an optical fiber 24 is fitted, and a specified number of grooves 25 in which bumps 27 formed on a semiconductor laser 23 are fitted are formed on a substrate 22 by anisotropic etching. By fitting and fixing the bump 27 on the semiconductor laser 23 in the groove 25 on the substrate 22 and fitting and fixing the optical fiber 24 in the guide groove 26, optical coupling is performed in a state that the optical axes are aligned.

5. 发明专利

JPH08330673A OPTICAL SEMICONDUCTOR DEVICE 失效
公开(公告)号：JPH08330673A
公开(公告)日：1996-12-13
申请号：JP13693395
申请日：1995-06-02
申请人： FUJITSU LTD
发明人： TABUCHI HARUHIKO , NORIZUKI MASUMI , GOTO MASAMI
IPC分类号： G02B6/12 , G02B6/122 , H01S3/10 , H01S5/00 , H01S5/026 , H01S5/10 , H01S5/12 , H01S5/20 , H01S3/18
摘要： PURPOSE: To reduce crystal deformation in a part where the core layer of a laser beam diameter conversion waveguide passage gradually becomes thin so as to improve the reliability. CONSTITUTION: This device is provided integrally with a laser beam generating area 51 and laser beam diameter conversion waveguide passage 52. The passage 52 is provided with a thickness gradually-decreasing part 43a constituting part of a core layer 54, upper and lower clad layers 56 and 55, a propagation constant decreasing emphasis layer 57 between the layer 54 and lower clad layer 55, and a propagation constant decreasing emphasis layer 58 between the layer 54 and upper clad layer 55. The layers 57 and 58 have a lower refraction index h12 than those n11 of the layers 55 and 56. The layers 57 and 58 act so as to decrease the propagation constant. Thus, the relative thickness t11 /t10 of the part 54a is 0.7, which is larger compared with the conventional one.

6. 发明专利

JPH03271699A HEAT SIPHON DEVICE 失效
公开(公告)号：JPH03271699A
公开(公告)日：1991-12-03
申请号：JP6802790
申请日：1990-03-20
申请人： FUJITSU LTD
发明人： MORI KAZUYUKI , OIKAWA YOICHI , GOTO MASAMI , YAMAMOTO TAKESHI
IPC分类号： F25D9/00 , F28F9/22
摘要： PURPOSE:To quicken heat absorbing cycle and improve cooling efficiency by a method wherein a sealed vessel is filled with operating fluid so that an upper space remains while a convection member, permitting the circular convection of the fluid, is arranged in the liquid reservoir of the sealed vessel. CONSTITUTION:A substance to be cooled 17 is adhered to the side of a sealed vessel 11 through an adhesive agent having heat resistant property. The heat of the substance to be cooled 17 is absorbed by operating liquid 13, approximated to the substance 17, as evaporating heat, the vapor of the operating liquid 13 ascends to an upper space 12 from the level of the liquid, the heat of the vapor is dissipated into atmosphere through the wall surfaces of the sealed vessel 11 and, then, the vapor is condensed and is recirculated into the operating liquid 13 along the wall surfaces of the sealed vessel 11 at the sides far from the substance to be cooled 17. The operating liquid 13 flows down in a liquid reservoir 14 due to the reduction of the temperature thereof and passes through a gap between a partitioning plate 15 and the bottom surface of the vessel 11 whereby the liquid is exposed to the heat of the substance to be cooled 17 again. The operating liquid 13 effects circular convection so as to surround the partitioning plate 15 in such a manner and the substance to be cooled 17 is cooled effectively.

7. 发明专利

JPH02197185A SEMICONDUCTOR LASER ASSEMBLY WITH BUILT-IN ELECTRONIC COOLING ELEMENT 失效
公开(公告)号：JPH02197185A
公开(公告)日：1990-08-03
申请号：JP1501289
申请日：1989-01-26
申请人： FUJITSU LTD
发明人： GOTO MASAMI
IPC分类号： H01S5/00
摘要： PURPOSE:To enable the high speed drive of a semiconductor laser keeping the reduction minimum in temperature difference between two faces of an element by a method wherein a high electric conductor where an LD chip is mounted is directly fixed to a metal case. CONSTITUTION:An LD chip 21 is mounted on end fixed to a stem 31 formed of a material which is high in electric conductivity and low in thermal conductivity. The stem 31 is extended to be directly connected and fixed to the inner face of a metal case 27. A high frequency board 32, on which an electric signal transmitting pattern is formed, is pasted on the stem 31. And, the stem 31 is mounted on a Peltier element 23, where the element 23 is composed of a semiconductor element possessed of the Peltier effect sandwiched between ceramic boards 24 and 25. then a current and a voltage applied to the electrodes of the element 23 are controlled, thermal energy is transferred in one direction through the element 23 to enable the element 21 to be cooled down to an appropriate temperature.

8. 发明专利

JPS63184A FSK DIRECT MODULATION SYSTEM OF SEMICONDUCTOR LASER 失效
公开(公告)号：JPS63184A
公开(公告)日：1988-01-05
申请号：JP14380286
申请日：1986-06-19
申请人： FUJITSU LTD
发明人： OSAWA CHIAKI , CHIKAMA TERUMI , GOTO MASAMI , HIRONISHI KAZUO
IPC分类号： H01S5/06 , H01S5/068 , H01S5/0683 , H01S5/0687
摘要： PURPOSE:To prevent the frequency variation of an LD based on a temperature change by controlling driving currents at modulation input pulses of '1' so that frequency variation under the two high and low states and the intermediate state is equalized. CONSTITUTION:A frequency discriminator circuit 9 frequency-discriminates an output from a PD 8 by predetermined frequency discrimination characteristics, and generates a discrimination output having magnitude corresponding to displacement from center frequency and polarity. A local optical oscillator 7 varies optical oscillation frequency in response to the discrimination output from the frequency discriminator circuit 9, thus keeping the optical oscillation frequency at oscillation frequency f2 at the time of driving currents corresponding to '0' of the input pulses of an LD 3. The output of (f2-f1) is passed through a low-pass filter 10, and the output of f3-f2 is passed through a low-pass filter 11. An output from the low-pass filter 11 is mixed with an output from the low-pass filter 10 in a mixer 13, and the output of the difference frequency of both outputs is acquired. The output is fed back to a coder 5, and controlled so as to adjust the difference of the high and low variation of driving currents corresponding to '1' generated in the coder 5 at zero.

9. 发明专利

JPS62293833A OPTICAL INPUT AND OUTPUT DEVICE 失效
公开(公告)号：JPS62293833A
公开(公告)日：1987-12-21
申请号：JP13689286
申请日：1986-06-12
申请人： FUJITSU LTD
发明人： CHIKAMA TERUMI , OSAWA CHIAKI , GOTO MASAMI , HIRONISHI KAZUO
IPC分类号： G02B6/293 , G02B6/28 , H04B10/00 , H04B10/07 , H04B10/27 , H04B10/275 , H04B10/29 , H04B10/516 , H04B10/61
摘要： PURPOSE:To provide lots of terminal equipments by allowing an optical loop network to be used for the coherent optical frequency multiplex communication system or the like using the heterodyne or homodyne using an optical frequency allocated to each terminal equipment and applying mutual communication. CONSTITUTION:Part of plural frequency lights from a 1st optical input section 1 is reflected on a mirror 5 having no wavelength dependancy, outputted to 1st optical output section 2, the remaining light is transmitted and the output side of the transmitted light is provided with an optical multiplexor means 6, which multiplexes the transmitted light and a single frequency light selected at a narrow band without giving effect onto the light of the other frequencies and inputted from 2nd optical input section 3 and outputs the result to a 2nd optical output section 4 with nearly no loss. The means 6 selects the light of single frequency from the 2nd light input section 3 without giving effect on the light of the other frequency at a narrow band and multiplexes said light and the light of plural frequencies inputted from a mirror 6 without almost any loss, and since the branch insertion loss is less and the interval of the light wavelengths is made very narrow, lots of small sized terminal equipments are inserted into the option loop network.

10. 发明专利

JPS6286326A OPTICAL ISOLATOR 失效
公开(公告)号：JPS6286326A
公开(公告)日：1987-04-20
申请号：JP22487085
申请日：1985-10-11
申请人： FUJITSU LTD
发明人： CHIKAMA TERUMI , ONODA YOSHITO , GOTO MASAMI
IPC分类号： G02B27/28 , G02B6/42
摘要： PURPOSE:To obtain an extremely small optical isolator by adhering a thin film type polarizer, a thin Farady rotor and an inclined uniaxial optical crystal to the end surface of an optical fiber. CONSTITUTION:The polarizer P, the rotor FR, and the optical crystal OC are mutually adhered and joined and the end surface of the optical crystal OC is adhesively joined to the obliquely ground end surface of the optical fiber F to unite the whole elements. Incident light is made incident upon the polarizer P, the transmitted light is turned to straightly polarized light with 45 deg. inclination from the horizontal direction (x) and the straightly polarized light is rotated by 45 deg. in the succeeding rotor FR so as to be turned to horizontal light. The succeeding optical crystal OC is arranged so that its optical axis K (shown by a dotted line) has a vertical direction y with 45 deg. inclination from the polarized light [with 45 deg. inclination from the horizontal direction (x)] transmitted through the polarizer P. Namely, the polarized light transmitted through the rotor FR becomes an ordinary optical component with 90 deg. inclination from the optical axis K of the optical crystal OC, so that the transmitted polarized light is refracted by the optical crystal OC at a refractive index (no) and the refracted light is made incident upon the optical fiber F.

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