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1. 发明专利

JPH09244076A MULTIPLE WAVELENGTH LIGHT SOURCE 失效
公开(公告)号：JPH09244076A
公开(公告)日：1997-09-19
申请号：JP5201796
申请日：1996-03-08
申请人： TOSHIBA CORP
发明人： MANITSUSHIYU SHIYAAMA , SUGAWARA MITSURU
IPC分类号： G02F1/35 , H04B10/07 , H04B10/2507 , H04B10/272 , H04B10/40 , H04B10/50 , H04B10/508 , H04B10/524 , H04B10/532 , H04B10/556 , H04B10/572 , H04B10/588 , H04B10/60 , H04J14/02 , H04B10/02 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To obtain a wide-band white pulse of non-polarization with a simple and inexpensive method. SOLUTION: Respective light pulses are alternately changed to orthogonal two polarized states by inputting A light pulse string to be generated by a light pulse string generator 21 and an oscillator 22 and by drivingly controlling a phase shifter 23 based on a pulse repetation frequency. An arbitrary wavelength is cut out to be outputted in a light wavelength separator 27 by amplifying the light pulse string with an EDFA (a light amplifier) 25 and by expanding SC spectrums while spreading light spectrums with an SC fiber 26. In this case, since the light string is made so that polarized states are orthogonally crossed every pulse, it is not necessary to hold the polarization by the connection between the SC fiber 26 and the light mudulator. Especially, when the polarization distribution of the SC fiber 26 is sufficiently small, orthogonally crossed SC pulses are not overlapped in a time-domain. Consequently, the polarization degree of time average can be maintained to zero and then the wide-band white pulse of non-polarization is obtained.

2. 发明专利

JPH09247098A LIGHT TRANSMITTER AND LIGHT TRANSMISSION SYSTEM 失效
公开(公告)号：JPH09247098A
公开(公告)日：1997-09-19
申请号：JP4747196
申请日：1996-03-05
申请人： TOSHIBA CORP
发明人： MANITSUSHIYU SHIYAAMA , IBE HIROYUKI
IPC分类号： G02F1/025 , H04B10/07 , H04B10/2507 , H04B10/272 , H04B10/40 , H04B10/50 , H04B10/516 , H04B10/54 , H04B10/564 , H04B10/60 , H04B10/61 , H04B10/152 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/142 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To suppress intense noise, to transmit a signal with narrow ASE (amplified natural discharge light) at a higher bit rate and to effectively use an optical band. SOLUTION: The natural discharge light of a wide band is emitted from a light source 21 and an optical filter 22 cuts specified wavelength light and inputs it in an optical modulator 23. A part of wavelength obtained in the optical filter 22 is extracted by an optical coupler 24 and a photodiode 25 measures the light intensity amplitude. The measured result is polarity-inverted in an inversion amplifier 27 and it is set to be the modulation input of an optical modulator 23. Thus, an ALC processing (automatic level control) is executed, the light intensity fluctuation of wavelength light is suppressed and an optical carrier is generated. The optical carrier is inputted to an optical modulator 26 and is modulated with data D inputted through an amplifier 28. Thus, an optical transmission signal is obtained. Thus, the intense noise of the optical carrier can be suppressed by ALC and the signal of the high bit rate can be transmitted with the considerably low bit error rate.

3. 发明专利

JPH0961771A POLARIZATION SCRAMBLING DEVICE 失效
公开(公告)号：JPH0961771A
公开(公告)日：1997-03-07
申请号：JP21573695
申请日：1995-08-24
申请人： TOSHIBA CORP , KOKUSAI DENSHIN DENWA CO LTD
发明人： MANITSUSHIYU SHIYAAMA , OSHIMA SHIGERU , TOMIOKA TAZUKO , TAKAHIRA HITOSHI , YAMAMOTO SHU
IPC分类号： G02F1/035 , G02F1/01 , G02F1/09 , H04B10/2507 , H04B10/516 , H04B10/532 , H04B10/548 , H04B10/61 , H04B10/04 , H04B10/06 , H04B10/142 , H04B10/152
摘要： PROBLEM TO BE SOLVED: To provide polarization scrambling device capable of scrambling even for an input light which is in any kinds of polarized states. SOLUTION: A first and a second polarization dependent phase modulators 1, 7 are optically connected in series so that respective axes 3, 9 are relatively inclined by 45 deg. and the first modulator 1 is driven by an electric signal to be generated in a first driving signal source 2 and the second modulator 7 is driven by an electric signal to be generated in a second driving signal source 8. Then. the polarized component in polarized components of the input light which is not in the axial direction of the first modulator 1 is scrambled and the polarization degree remained in the axial direction of the first modulator 1 is scrambled in the second modulator 7.

4. 发明专利

JPH07231297A OPTICAL FIBER POLARIZED WAVE MODE DISPERSION COMPENSATION EQUIPMENT 失效
公开(公告)号：JPH07231297A
公开(公告)日：1995-08-29
申请号：JP2044694
申请日：1994-02-17
申请人： TOSHIBA CORP
发明人： KOSEKI TAKESHI , IBE HIROYUKI , MANITSUSHIYU SHIYAAMA
IPC分类号： H04B10/2507 , H04B10/07 , H04B10/2569 , H04B10/02 , H04B10/18
摘要： PURPOSE:To automatically obtain a state in which an equalization error signal is minimized by using a parameter control circuit to slightly change a parameter for a polarized wave mode dispersion equalization optical circuit thereby finding out the direction of decrease of the equalization error signal and repeating pameratemer control through a control loop. CONSTITUTION:A signal light (pulse signal) subject to polarized wave mode dispersion from an optical transmission line 1 is received by a photo detector 3 via an equalization (optical) circuit 2 and amplified by an AGC circuit 4 and it is identified by an identification circuit 6. The identified reception pulse signal is compared with a synchronization reception pulse signal before identification at a differential amplifier 9 to obtain a difference signal and it is rectified and integrated to generate the equalization error signal. Then a pulse control circuit 12 is used to change slightly a parameter (phik, thetak) of the polarized wave mode dispersion equalization circuit 2 thereby finding out a direction of a decreased equalization error signal and pulse control is repeated through the control loop to kick out the equalization error signal to be minimized automatically. Thus, PMD distortion is compensated.

5. 发明专利

JPH08316910A OPTICAL TRANSMITTER 失效
公开(公告)号：JPH08316910A
公开(公告)日：1996-11-29
申请号：JP11600395
申请日：1995-05-15
申请人： TOSHIBA CORP
发明人： MANITSUSHIYU SHIYAAMA
IPC分类号： H01S3/07 , H01S3/06 , H01S3/10 , H04B10/25 , H04B10/2507 , H04B10/291 , H04J14/00 , H04J14/02 , H04B10/02 , H04B10/18
摘要： PURPOSE: To totally reduce the degree of polarization of an optical signal and to suppress the PHB(polarization hole burning) by increasing the full polarization mode dispersion caused in an optical fiber transmission line compared with the reciprocal of the standard deviation of optical frequency spectrum of the optical signal to be transmitted. CONSTITUTION: Two inverted distribution of exciting density of an erbium atom can be suppressed when the polarization states are orthogonal to each other between two optical signals of wavelengths λ1 and λ2. Then the PHB can also be suppressed. This effect is limited only when the value of full PMD(polarization mode dispersion) of an optical transmission line is comparatively small. The optical transmitters 111 to 11n output the optical signals of linear polarization of wavelengths λ1 to λn in the same amplitude, then sent to an optical coupler 12 and coupled into a single signal. The output terminals of transmitters 111 to 11n are connected to the coupler 12, via a polarization holding fiber, and every optical signal is paired with another. These paired optical signals are adjusted so that their polarizing directions are orthogonal to each other. Thus the polarization state of coupled optical signals are turned during their transmission in response to the difference of frequency between them. Then a state equal to the polarization scramble is secured.

6. 发明专利

JPH06261348A VARIABLE LIGHT DELAY CIRCUIT 失效
公开(公告)号：JPH06261348A
公开(公告)日：1994-09-16
申请号：JP4122593
申请日：1993-03-02
申请人： TOSHIBA CORP
发明人： KOSEKI TAKESHI , MANITSUSHIYU SHIYAAMA , IBE HIROYUKI
IPC分类号： H04B10/40 , H04B10/00 , H04B10/50 , H04B10/60 , H04Q3/52 , H04B10/02
摘要： PURPOSE:To provide a variable light delay circuit capable of arbitrarily delaying transmission light and contributing the synchronous processing of an optical signal, in its turn the realization of an optical ATM exchange. CONSTITUTION:Plural primary group delay distributed light circuits 11 and 12 whose distributed codes differ and which are mutually connected in serial and a center light frequency control means 13 which variably controls the center light frequencies of the respective primary group delay distributed light circuits 11 and 12 are provided. The circuit is controlled in such a way that the sum of the group delay distribution of the respective primary group delay distributed light circuits 11 and 12 becomes zero distribution through the center light frequency control means 13.

7. 发明专利

JPH0677561A OPTICAL AMPLIFIER 失效
公开(公告)号：JPH0677561A
公开(公告)日：1994-03-18
申请号：JP22581892
申请日：1992-08-25
申请人： TOSHIBA CORP
发明人： KOSEKI TAKESHI , MANITSUSHIYU SHIYAAMA , IBE HIROYUKI
IPC分类号： G02B6/00 , G02F1/35 , G05D25/00 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/094 , H01S3/0941 , H01S3/10 , H04B10/2507 , H04B10/29 , H04B10/293 , H04B10/16
摘要： PURPOSE:To reduce the waveform distortion of transmitted light due to singularity in low band characteristics by a method wherein an optical amplifier is composed by non-excitedly connecting, to an optical amplifier output end using rare earth ion doped filter, an optical circuit containing the same rare earth element ions. CONSTITUTION:When a waveform distorted optical signal outputted from an excitation accelerating stage 2 is inputted in an optical circuit containing non- excited rare earth element ions, the front end of a packet pulse line rapidly excites Er ions so that the ions may absorb the light to be brought into saturated state. By this action, the front end of the packet pulse line is to be flattened to be consumed for the saturation with the Er ions. Thus, the succeeding pulse lines in relatively narrow width pass through only slightly attenuated by the absorptive saturation. Accordingly, the wavelength distortion of transmitted light due to the peculiarity in low region characteristics can be reduced thereby enabling the title optical amplifier applicable in a saturated region to be provided by applying the optical transmission system delivering the packet in a burst mode.

8. 发明专利

JPH08248456A OPTICAL FIBER AMPLIFIER 失效
公开(公告)号：JPH08248456A
公开(公告)日：1996-09-27
申请号：JP5010395
申请日：1995-03-09
申请人： HOTATE KAZUO , YAMASHITA SHINJI , TOSHIBA CORP
发明人： HOTATE KAZUO , YAMASHITA SHINJI , ITO MASATAKA , SUGAWARA MITSURU , MANITSUSHIYU SHIYAAMA
IPC分类号： G02F1/35 , H01S3/06 , H01S3/067 , H01S3/07 , H01S3/23 , H04B10/2569 , H04B10/29 , H04B10/291
摘要： PURPOSE: To provide an optical fiber amplifier capable of stabilizing the polarization state of light signal output even if there is a fluctuation in the temp. or tension of an erbium-doped optical fiber(EDF). CONSTITUTION: This optical fiber amplifier includes an optical circulator 11 which outputs the light signal inputted from a first terminal P1 to a second terminal P2 and outputs the light signal inputted from this second terminal P2 to a third terminal P3, the EDF 12 which is connected at one end to the second terminal P2 of this optical circulator 11 and is excited by receiving exciting light to amplifier and output the input light signal, a reflection mirror 14 which is connected at the other end of the EDF 12 and reflects and sends back the light signal from the EDF 12, an LD light source 15 for excitation which generates the exciting light to the EDF 12 and an optical coupler 13 which introduces the exciting light from this light source 15 to the EDF 12. A suitable torsion is applied to the EDF 12 in such a manner that the EDF has a circularly polarized light maintaining characteristic.

9. 发明专利

JPH0818538A OPTICAL WAVELENGTH MULTIPLX NETWORK SYSTEM 失效
公开(公告)号：JPH0818538A
公开(公告)日：1996-01-19
申请号：JP14355994
申请日：1994-06-24
申请人： TOSHIBA CORP
发明人： MANITSUSHIYU SHIYAAMA , ITO MASATAKA
IPC分类号： G02F1/125 , G02F1/00 , H04B10/032 , H04B10/038 , H04B10/079 , H04B10/2507 , H04B10/2587 , H04B10/27 , H04B10/275 , H04B10/291 , H04J1/00 , H04J14/00 , H04J14/02 , H04B10/20
摘要： PURPOSE:To facilitate stability control of a light source by concentrating light sources of terminal nodes. CONSTITUTION:A central node CN generates a transmission wavelength light of each terminal node LN#k by a multi-wavelength light source OG, a multiplexer MUX1 multiplexes the lights and the result is fed to an optical fiber ring FR. On the other hand, the light from the FR is demultiplexed for each wavelength at a demultiplexer DEMUX, converted into an electric signal by a converter O/E and exchanged by an exchange switch SW for each destination, converted into an allocated wavelength light at the converter E/O, multiplexed by a multiplexer MUX2 and the result is sent to the FR. A demultiplexer DEMUX of a terminal node LN#k demultiplexes the transmission wavelength light and the reception wavelength light allocated to the node from the FR and a demultiplexer WDM demultiplexes the transmission wavelength light and the reception wavelength light, the optical receiver RX receives the reception wavelength light and an optical modulator MOD modulates the transmission wavelength light by a transmission signal and the multiplexer MUX multiplexes the modulation light with an undemultiplexed light and the result is fed to the FR.

10. 发明专利

JPH06252890A OPTICAL ADD DROP WAVELENGTH MULTIPLEXER DEMULTIPLEXER 失效
公开(公告)号：JPH06252890A
公开(公告)日：1994-09-09
申请号：JP3334093
申请日：1993-02-23
申请人： TOSHIBA CORP
发明人： KOSEKI TAKESHI , MANITSUSHIYU SHIYAAMA , IBE HIROYUKI
IPC分类号： G02B6/00 , H04J14/00 , H04J14/02
摘要： PURPOSE:To insert an optical signal of an optional wavelength from a 1st stage and to extract a desired optical signal among plural optical signals at a final stage at a low cost and low loss by providing proper delay and phase shift to optical transmission lines in plural optical distributers connected in series each having a couple of input terminal and output terminal. CONSTITUTION:Optical distributers each having optical input and output terminal in pairs are connected in series by using an optical guide path to form a coherent optical transversal filter. A couple of optical guide paths between the optical distributers are adjusted to have the same delay based on the length and the phase is shifted based on the optical signal wavelength. Then a delay time T and a phase shift theta1-n-1 are set by a predetermined equation together with distribution ratio of the optical distributers C1-Cn by using optical delay lines D1-n-1. Then optical signals lambda1, 2-lambdad1, 2- An are inputted to one of the distributer C1 and optical signals lambdaa1, 2- are inputted to the other. Thus, the optical signals lambdad1, 2- are extracted from the distributer Cn and the signals lambdaa1,2- are inserted at a low cost and low loss.

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