专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明专利

JP2002247073A MULTIPLEX REPEATING TRANSMITTER 失效
公开(公告)号：JP2002247073A
公开(公告)日：2002-08-30
申请号：JP2001041481
申请日：2001-02-19
申请人： NIPPON TELEGRAPH & TELEPHONE , NTT ELECTRONICS CORP
发明人： MATSUURA AKIHIKO , KATAOKA TOMOYOSHI , TOMIZAWA MASAHITO , YAMADA YOSHIRO , AIZAWA SHIGEKI , HAMADA MASANORI
IPC分类号： H04J3/00 , H04J3/04 , H04J3/16 , H04J14/08 , H04L12/46 , H04Q11/04
摘要： PROBLEM TO BE SOLVED: To provide a multiplex repeating transmitter with simple structure efficient for reduction of a network cost to output an optical signal with OTU1 frame structure of an optical transmission network by multiplexing a GbE signal of a gigabit LAN. SOLUTION: The multiplex repeating transmitter is provided with two channels of GbE signal receiving circuits 101, 102 to receive the GbE signal, FIFO memories 105, 106 which can be written and read by two channels of independent clocks connected with each of the GbE receiving circuits, a multiplexing circuit 109 to multiplex two channels of the read signal, an OTU frame generating circuit 111 to map the channels of the multiplexed signal to an OTU payload of an OTU frame and an optical transmitting circuit 115 to transmit a transmission signal with OTU frame structure.

2. 发明专利

JPH08316911A OPTICAL SIGNAL REPRODUCER 失效
公开(公告)号：JPH08316911A
公开(公告)日：1996-11-29
申请号：JP12014795
申请日：1995-05-18
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AIZAWA SHIGEKI , ITO FUMIHIKO
IPC分类号： H04B10/2507 , H04B10/29 , H04B10/293 , H04B10/299 , H04B10/524 , H04B10/58 , H04B10/02 , H04B10/16 , H04B10/17 , H04B10/18
摘要： PURPOSE: To provide an optical signal reproducer which is not easily affected by such influences as timing jitters and other fluctuations by applying a means to form a sharp waveform of an optical clock signal. CONSTITUTION: An optical clock signal of sine waveform that is produced at an optical clock signal generation part 70 is converted into a pulse signal and inputted to a nonlinear loop mirror 80. Thus the clock signal is not easily affected by the influences of timing jitters. Then the optical clock signal is amplified by an optical amplifier 30 and inputted to a pulse compressing fiber 31. Plural frequency components are generated in the fiber 31 by the nonlinear effect during propagation of an optical fiber. The phase relationships are automatically synchronized with each other among those frequency components, so that the optical clock signal of sine waveform is converted into a pulse signal in response to propagation of the optical fiber. Thus an optical signal data string can be reproduced with reduced distortions.

3. 发明专利

JPH0850313A OPTICAL RECEIVER 失效
公开(公告)号：JPH0850313A
公开(公告)日：1996-02-20
申请号：JP18578094
申请日：1994-08-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AIZAWA SHIGEKI , NOGUCHI KAZUHIRO
IPC分类号： G02F3/00 , G06E1/00 , G06E3/00 , G06F13/18 , H04J14/00 , H04J14/02
摘要： PURPOSE:To continuously detect the distribution of spatial light intensity corresponding to the respective wavelength of wavelength multiplexed signal light and to enhance the receiving sensitivity of a signal corresponding to the respective wavelength. CONSTITUTION:This is an optical receiver provided with an optical conversion device converting the wavelength multiplexed signal light to the distribution of the spatial light intensity corresponding to the wavelength and a pattern recognition means converting the distribution of the spatial light intensity to the distribution of an electric signal by a photodetector array 7, recognizing it as a pattern and separating and outputting the signal corresponding to the respective wavelength. A waveguide type diffraction grating is used as the optical conversion device, the output part of the concave slab waveguide 14 on the output side of the waveguide type diffraction grating is formed into tapered from and connected to a waveguide array for output 15. Besides, the array 15 is connected to the photodetector array 7.

4. 发明专利

JPH06314347A NEURAL NETWORK LEARNING CIRCUIT 失效
公开(公告)号：JPH06314347A
公开(公告)日：1994-11-08
申请号：JP10460393
申请日：1993-04-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： NOGUCHI KAZUHIRO , MIYAO HIROSHI , AIZAWA SHIGEKI , KOGA MASABUMI , MATSUMOTO TAKAO
IPC分类号： G06F15/18 , G06G7/60 , G06N99/00
摘要： PURPOSE:To provide a neural network learning circuit which does not deteriorate the fast learning performance and also reduces the occurrence of crosstalks by superposing a specific orthogonal code pattern on the corresponding weight or the threshold output signal and multiplying the acquired error signal by one of orthogonal code patterns for integration to directly calculate a changed variable of the energy relation caused by the change of the weight or the threshold. CONSTITUTION:A learning circuit includes a means which compares the output signal of a neural network with a teacher signal to produce an error signal in a learning mode of the neural network. In such a circuit, the orthogonal code patterns are defined as P1-Pn and an array of orthogonal code patterns Pi is defined as Pi=(Pi1,...,Pim) where Pik=+ or -1 and 1

5. 发明专利

JPH0588115A OPTICAL ISOLATOR 失效
公开(公告)号：JPH0588115A
公开(公告)日：1993-04-09
申请号：JP25223291
申请日：1991-09-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AIZAWA SHIGEKI
IPC分类号： G02B27/28
摘要： PURPOSE:To provide the optical isolator which does not depend upon the wavelength of input light and prevents the light from being reflected. CONSTITUTION:This optical isolator is provided with 1st-4th polarized light demultiplexing and multiplexing means 31-34, 1st and 2nd nonreciprocal polarizing rotators 35 and 37, and 1st and 2nd rotary polarizing rotators 36 and 38; and the nonreciprocal polarizing rotator 35 and rotary polarizing rotator 36 are arranged between the polarized light demultiplexing and multiplexing means 31 and polarized light demultiplexing and multiplexing means 32 and the nonreciprocal polarizing rotator 37 and rotary polarizing rotator 38 are arranged between the polarized light demultiplexing and multiplexing means 32 and polarized light demultiplexing and multiplexing means 33. Further, the optical axis of the polarized light demultiplexing and multiplexing means 32 is rotated at a specific angle to the optical axis of the polarized light demultiplexing and multiplexing and multiplexing means 31, the optical axis of the polarized light demultiplexing and multiplexing means 33 is rotated at a specific angle to the optical axis of the polarized light demultiplexing and multiplexing means 32, and the optical axis of the polarized light demultiplexing and multiplexing means 34 is made to cross the optical axis of the polarized light demultiplexing and multiplexing means 33 at right angles.

6. 发明专利

JPH0588112A OPTICAL NONRECIPROCAL CIRCUIT 失效
公开(公告)号：JPH0588112A
公开(公告)日：1993-04-09
申请号：JP25159391
申请日：1991-09-30
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AIZAWA SHIGEKI , KOGA MASABUMI
IPC分类号： G02B27/28
摘要： PURPOSE:To constitute thin means which multiplex and demultiplex originary light and extraordinary light and to provide the optical nonreciprocal circuit which is made compact in overall size. CONSTITUTION:The 1st, 2nd, and 3rd polarized light demultiplexing and multiplexing means 21, 22, and 23 are composed of couples of birefringent diffraction gratings 21a and 21b, 22a and 22b, and 23a and 23b which are arranged in parallel and equal in diffraction angle and then the respective demultiplexing and multiplexing means 21-23 are shortened in length in the traveling direction of light to make the size of the whole circuit small.

7. 发明专利

JPH04110739A PRESSURE SENSOR 失效
公开(公告)号：JPH04110739A
公开(公告)日：1992-04-13
申请号：JP23177590
申请日：1990-08-31
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AIZAWA SHIGEKI , NOGUCHI KAZUHIRO , MATSUMOTO TAKAO
IPC分类号： G01L1/24
摘要： PURPOSE:To accomplish a pressure sensor which can measure pressures applied to a number of positions simultaneously by introducing light pulse to a light wave-guide path, sensing the back diffusion light, and processing the light intensity distribution with a neural network. CONSTITUTION:A pulsed light source 22 generates input light pulse 31, which is passed through a light wave-guide path 23 for input and a photo-coupler 24 to another light wave-guide path 21 for sensing, to excite the lower degree mode of the wave-guide path 21. When the pressure to be measured 28 is applied to this wave-guide pipe 21, a minute bend is generated on the pipe 21, and mode change occurs on the light 32 in propagation. This propagating light 32 generates difusive light in each position on the wave-guide path 21, and part of the diffusive light propagates as the back diffusion light 33 to become output light 34 after passing through the photo-coupler 24 and a light wave-guide path 25 for output. This output light is photoelectrically transduced by a photo-sensor array 26 and fed to a neutral network 27. If the relationship of the light intensity distribution given by the array 26 to various pressure values to be measured which are applied to the wave-guide path 21, is studied in advance by the network 27, the position and size of the pressure to be measured 28 can be sensed.

8. 发明专利

JP2000147281A OPTICAL MULTIPLEXER/DEMULTIPLEXER 失效
公开(公告)号：JP2000147281A
公开(公告)日：2000-05-26
申请号：JP32239998
申请日：1998-11-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： AIZAWA SHIGEKI , SHIMANO KATSUHIRO , OGUCHI KIMIO
IPC分类号： G02B6/12 , G02B6/293
摘要： PROBLEM TO BE SOLVED: To embody an optical multiplexer/demultiplexer which is totally small in crosstalks by connecting the respective input/output ports of a first wavelength separating element and the respective input/output ports of a second wavelength separating element so as to satisfy specific conditions. SOLUTION: The array waveguide diffraction gratings(AWG) comprising an input waveguide 11, an input side concave slab waveguide 12, an array waveguide 13, an output side concave slab waveguide 14 and an output waveguide array 15 are similar to the conventional array waveguide diffraction gratings. The wavelength separating element 16 varying in the transmission wavelengths between the respective input/output ports from each other is inserted into the output waveguide array 15 and is so set that the wavelengths branched to the respective wavelengths of the output waveguide array 15 and the transmission wavelengths between the respective input/output ports of the wavelength separating element 1 are so set as to coincide with each other. Both wavelength separating elements are thus connected in such a manner that the wavelengths (optical frequencies) branched to the respective input/output ports of the first wavelength separating element and the transmission wavelengths (optical frequencies) between the respective input/output ports of the second wavelength separating element 16 respective coincide with each other.

9. 发明专利

JP2000032022A OPTICAL TRANSMISSION SYSTEM 失效
公开(公告)号：JP2000032022A
公开(公告)日：2000-01-28
申请号：JP20088798
申请日：1998-07-15
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SHIMANO KATSUHIRO , AIZAWA SHIGEKI
IPC分类号： H04B10/07 , H04B10/032 , H04B10/077 , H04B10/27 , H04B10/275 , H04L12/42 , H04L12/437 , H04B10/08 , H04B10/20
摘要： PROBLEM TO BE SOLVED: To provide the optical transmission system with a small system scale that can monitor each device independently of number of receivers and of whether or not the receivers are normal or faulty in one-to-multi communication. SOLUTION: The optical transmission system consists of a transmitter 31 that has a transmission means, a reception means receiving again a signal sent from the transmission means after one circulation of a ring, and a transmitter control means that receives communication quality information of an optical signal received by the reception means and can communicate system monitor information with other in-ring devices and of receivers 32, 33 each having a branch means that branches an optical signal propagated in the ring and transmits the one branched optical signal into the ring again, a reception means that receives the other branched optical signal by the branch means, and a receiver control means that communicates the system monitor information with the transmitter control means, and each of the devices above is interconnected as a ring by an optical transmission line 34.

10. 发明专利

JP2000031969A TRANSMISSION MANAGEMENT DEVICE AND TRANSMISSION MANAGEMENT METHOD 失效
公开(公告)号：JP2000031969A
公开(公告)日：2000-01-28
申请号：JP19276098
申请日：1998-07-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SHIMANO KATSUHIRO , NORIMATSU SEIJI , AIZAWA SHIGEKI
IPC分类号： G06F13/00 , H04L12/24 , H04L12/26 , H04L12/28
摘要： PROBLEM TO BE SOLVED: To surely manage a multi-cast type network where a transmission signal from one transmitter is sent to plurality of receivers. SOLUTION: In a network where one transmitter 11 sends a signal to n-sets of receivers 12-1-12-n, a virtual path 16-i (i: 1-n) consisting of a virtual transmitter 13-i, a virtual transmission line 15-i, and a virtual receiver 14-i is set and managed. In the case of detecting a fault of the transmitter 11, it is recognized as a fault of n-sets of the virtual transmitters 13-i, and in the case of detecting a fault of the receivers 12-i, it is recognized as a fault of the corresponding virtual receivers 14-i, and in the case of occurrence of a transmission fault, the fault location is specified based on detected transmission information on each virtual path 16-i.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式