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41. 发明专利

JPH07159819A LIGHT SOURCE DEVICE 失效
公开(公告)号：JPH07159819A
公开(公告)日：1995-06-23
申请号：JP31075493
申请日：1993-12-10
申请人： MITSUBISHI CABLE IND LTD
发明人： TANAKA HIROYUKI , OMAE TOSHIKAZU , YOSHIDA MINORU , OIZUMI SEIRO
IPC分类号： G02B6/00 , G02F1/37 , H01S3/06 , H01S3/109 , H01S5/00 , H01S3/18
摘要： PURPOSE:To efficiently obtain optical secondary harmonic waves of sufficiently high intensity without requiring an optical resonator by condensing the light emitted from a light emitting means by an optical system, introducing this light into a KLN fiber and guiding the light in the KLN fiber held by a KLN fiber holding means. CONSTITUTION:The light of the linear polarization type emitted from a light source 1 is introduced through a polarization plane rotating device 2 and a condenser lens system 3 into the KLN fiber 4 from its one end face. Since the short side of the KLN fiber 4 is set at a prescribed length, the light introduced therein is propagated by the confining effect of the KLN fiber 4 with substantially no attenuation. The KLN fiber 4 does not have clad layers at all and is directly held by the KLN fiber holder 7. The refractive index of the KLN fiber holder is set lower than the refractive index of the KLN fiber 4. The light emitted from the KLN fiber 4 is introduced to the optical filter 6, out of which only the secondary harmonic wave are taken.

42. 发明专利

JPH07159627A KLN CRYSTAL OPTICAL FIBER 失效
公开(公告)号：JPH07159627A
公开(公告)日：1995-06-23
申请号：JP31075593
申请日：1993-12-10
申请人： MITSUBISHI CABLE IND LTD
发明人： TANAKA HIROYUKI , OMAE TOSHIKAZU , YOSHIDA MINORU , OIZUMI SEIRO
IPC分类号： G02B6/00 , G02B1/02 , G02F1/37 , H01S3/06 , H01S3/109
摘要： PURPOSE:To provide the entirely novel KLN crystal fiber which is adequate for optical secondary harmonic generation by having a core layer and clad layer which are respectively specific. CONSTITUTION:This KLN crystal fiber is composed of the core 1 consisting of the KLN (potassium lithium niobate) and having a square section and the clad layer 2 covering the outer periphery of the core layer 1. The core layer 1 is formed by using a growth device which is provided with a melt drawing out port in the bottom of a growth cell of a resistance heating type and is inserted with a melt feeder in this melt drawing out port, by which the KLN crystal having an optically homogeneous tetragonal crystal is obtd. The clad layer 2 is formed of a low-loss optical material having the refractive index lower than the refractive index of the KLN crystal. The process for production of the clad layer 2 is exemplified by coating, extruding, CVD methods, etc. The light from a light source is kept held in nearly a condensing state over the range of the entire length if this optical fiber is used as a fiber for optical second harmonic generation. Since the interaction length is made sufficiently long, the high optical second harmonic generation efficiency is obtd.

43. 发明专利

JPH06112573A OPTICAL FIBER LASER 失效
公开(公告)号：JPH06112573A
公开(公告)日：1994-04-22
申请号：JP25810792
申请日：1992-09-28
申请人： MITSUBISHI CABLE IND LTD
发明人： YOSHIDA MINORU , TANAKA HIROYUKI , OIZUMI SEIRO , SAWADA HISASHI , OMAE TOSHIKAZU , YOTSUYA MASAMI
IPC分类号： H01S3/07 , H01S3/06 , H01S3/094 , H01S3/106 , H01S5/00 , H01S3/18
摘要： PURPOSE:To enable an optical fiber laser using an optical fiber amplifying element which amplifies light by utilizing an induced emission effect to generate laser light having polarized light characteristics with a relatively simple constitution. CONSTITUTION:A light polarizing coupler 14 which emits light other than that having a specific polarized plane from a looped optical resonator circuit 2 after separating the light and has a polarized wave dependency and optical fiber polarized wave rotating element 16 which makes the polarized plane of laser light before and after making one turn in the circuit 2 are provided in the middle of the loop of the circuit 2.

44. 发明专利

JPH0450927A OPTICAL FIBER FOR AMPLIFICATION 失效
公开(公告)号：JPH0450927A
公开(公告)日：1992-02-19
申请号：JP15846490
申请日：1990-06-15
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , KIMURA YASURO , TANAKA HIROYUKI , OMAE TOSHIKAZU , YOSHIDA MINORU , MORISAWA MASAAKI , OIZUMI SEIRO , IKUNISHI SHIYOUGO
IPC分类号： G02B6/02 , G02B6/036 , G02F1/35
摘要： PURPOSE:To highly the gain of signal light with small power of exciting light by doping the center core of an optical fiber a rare earth element. CONSTITUTION:The center core 3a of a convex optical fiber B is doped with a rare earth element. When the relation between the power distribution p(r) of amplified signal light and the refractive index distribution n(r) of the fiber B is examined, the region p of the distribution p (r) above a standard level pO extends to the entire cross-sectional area of the core 3a. The entire cross-sectional area of the core 3a contributes to the amplification of signal light and sufficiently high gain is enabled.

45. 发明专利

JPH0450139A OPTICAL FIBER FOR AMPLIFICATION 失效
公开(公告)号：JPH0450139A
公开(公告)日：1992-02-19
申请号：JP15846290
申请日：1990-06-15
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , KIMURA YASURO , OMAE TOSHIKAZU , TANAKA HIROYUKI , YOSHIDA MINORU , MORISAWA MASAAKI , OIZUMI SEIRO
IPC分类号： C03C13/04
摘要： PURPOSE:To produce an optical fiber having a high amplification ratio by forming a quartz glass clad having refractive index smaller than that of core around a quartz glass core and doping Er and Al specified in dope amount in the interior of core. CONSTITUTION:An optical fiber 1 for amplification is constituted by forming a quartz based glass clad 3 having refractive index smaller than that of a quartz based glass core 2 having circular cross section around the core 2. Er, Ge and A are simultaneously doped in the interior of core 2 or peripheral edge of core 2 and dope amounts of Er and Al are each specified to

46. 发明专利

JPH03129330A OPTICAL COMMUNICATION SYSTEM 失效
公开(公告)号：JPH03129330A
公开(公告)日：1991-06-03
申请号：JP26780089
申请日：1989-10-14
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , KIMURA YASURO , TANAKA HIROYUKI , OMAE TOSHIKAZU , YOSHIDA MINORU , MORISAWA MASAAKI
IPC分类号： G02F1/35 , H04J14/00 , H04J14/02
摘要： PURPOSE:To amplify and transmit many signal light beams which differ in wavelength simultaneously with relatively simple constitution by providing an optical amplifier equipped with an optical fiber for amplification which amplifies signal light by guide emission and an exciting light source which excites the optical fiber for amplification, a multiplexer, and a demultiplexer. CONSTITUTION:The signals light beams which are emitted by plural light sources 14a - 14c and differ in wavelength from one another are multiplexed by the multiplexer 16 and sent through the optical fiber. The signal light is made incident on the optical amplifier 2 arranged at a specific position so as to compensate the attenuation in the transmission. The optical amplifier 2 has the optical fiber 4 for amplification excited with exciting light from the exciting light source 6 and when the multiplexed signal light is made incident on the optical fiber 4 for amplification in this state, the signal light beams having respective wavelengths are amplified by guide emission at the same time. The respective amplified signal light beams are transmitted through the optical fiber again, demultiplexed by the demultiplexer 18, and fetched to respective receivers. Consequently, the signal light beams having the different wavelengths can be amplified and transmitted simultaneously with the simple constitution.

47. 发明专利

JPH03127887A LIGHT AMPLIFIER 失效
公开(公告)号：JPH03127887A
公开(公告)日：1991-05-30
申请号：JP26724789
申请日：1989-10-13
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： NAKAZAWA MASATAKA , KIMURA YASURO , TANAKA HIROYUKI , OMAE TOSHIKAZU , YOSHIDA MINORU , MORISAWA MASAAKI
IPC分类号： G02B6/02 , G02F1/35 , H01S3/06 , H01S3/102 , H01S3/13 , H01S3/131 , H01S3/17
摘要： PURPOSE:To contrive to obtain the strength, which is always stable, of outputted signal light by a method wherein the power of a pumping light source or the quantity of light of the signal light is feedback-controlled according to the intensity of the signal light. CONSTITUTION:When signal light and pumping light are directed into an optical fiber 2 for amplification use, the fiber 2 is excited by the pumping light and the signal light is amplified along the fiber 2 by a stimulated emission. The amplified signal light is made to pass through a filter 10 and is outputted. In this case, the intensity of the signal light made to pass through the filter 10 or the intensity of the signal light prior to its incidence in the fiber 2 is detected by a photodetector 14. Then, the detection output of this photodetector 14 is compared with a reference value by a comparator 16. A controller 180 controls the intensity of the pumping light according to an output of this comparator 16. Thereby, the strength of output of the signal light is always held constant.

48. 发明专利

JPH03110526A OPTICAL SWITCH 失效
公开(公告)号：JPH03110526A
公开(公告)日：1991-05-10
申请号：JP24997089
申请日：1989-09-26
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： TANAKA HIROYUKI , OMAE TOSHIKAZU , YOSHIDA MINORU , MORISAWA MASAAKI , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G02B6/02 , G02F1/313 , G02F1/35
摘要： PURPOSE:To speed up ON/OFF switching and to improve S/N by using a doped optical fiber which is doped with a rare earth element for a part of a fusion- spliced and drawn part and a part connecting with it, and turning on/off exciting light irradiation freely with a light source for excitation. CONSTITUTION:A 1st optical fiber F1 uses a quartz optical fiber F1-c for an incidence end part side about its fusion-spliced and drawn part (a) as the center and the optical fiber F1-D doped with the rare earth element for providing the quartz optical fiber with an optical amplifying function for a projection end part side. Further, the incidence end part of the quartz optical fiber F1-c of the 1st optical fiber F1 is connected to a semiconductor laser 1 as the light source for excitation which emits exciting light Lp; and signal light Ls is made incident from the incidence end part of the 2nd optical fiber F2 and the other end part is an open end K. Then the light source 1 for excitation is so constituted that ON/OFF switching is freely performed. Consequently, the ON/OFF switching speed is increased, the signal light can be transmitted without any loss, ad the optical switch with a good S/N is obtained.

49. 发明专利

JPH03106087A OPTICAL FIBER 失效
公开(公告)号：JPH03106087A
公开(公告)日：1991-05-02
申请号：JP24564689
申请日：1989-09-20
申请人： MITSUBISHI CABLE IND LTD , NIPPON TELEGRAPH & TELEPHONE
发明人： OMAE TOSHIKAZU , TANAKA HIROYUKI , YOSHIDA MINORU , MORISAWA MASAAKI , NAKAZAWA MASATAKA , KIMURA YASURO
IPC分类号： G02B6/00 , C03C13/04 , G02F1/35 , H01S3/06 , H01S3/067 , H01S3/17
摘要： PURPOSE:To enhance an optical fiber more in amplifying action of signal light when it is made to serve an optical active element taking advantage of an induced emission by a method wherein Ca and Nd are made to dope the core of the optical fiber or the peripheral part of the core at the same time. CONSTITUTION:A quartz glass clad 3 whose refractive index is smaller than that of a core 2 is formed on the circumference of the core 2 circular in cross section, and furthermore the inside or the peripheral edge of the core 2 is doped with rare earth elements such as Nd and Ca at the same time. In an optical fiber 1 structured as above, Nd and Ca interact to make it high in fluorescent intensity for light of 1.3mum wavelength band. By this setup, an optical fiber can be more enhanced in amplifying action of signal light.

50. 发明专利

JPH0312340A RADIATION RESISTANT OPTICAL FIBER 失效
公开(公告)号：JPH0312340A
公开(公告)日：1991-01-21
申请号：JP14813289
申请日：1989-06-09
申请人： MITSUBISHI CABLE IND LTD
发明人： SUZUKI TOSHIYA , OMAE TOSHIKAZU , TANAKA HIROYUKI
IPC分类号： G02B6/00 , C03B37/012 , C03B37/027 , C03C13/04
摘要： PURPOSE:To reduce transmission loss due to radiation at low temp. by forming a guartz clad on a specified pure quartz core. CONSTITUTION:A core material made of pure quartz having

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