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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

JPH11251916A MANCHESTER CODE RECEPTION CIRCUIT 失效
公开(公告)号：JPH11251916A
公开(公告)日：1999-09-17
申请号：JP5381498
申请日：1998-03-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA YOSHIRO , SHIBATA YASUO
IPC分类号： H03M5/12 , H04B10/40 , H04B10/50 , H04B10/556 , H04B10/60 , H04B10/67 , H04B10/69 , H04B10/00 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To perform conversion from a Manchester code to an NRZ code without using the identifier of double speed. SOLUTION: The phases of the Manchester code of input and an encoding clock are compared in a phase comparator 7, phase comparator output is smoothed in a low-pass filter 8 and smoothed signals are converted into NRZ signals by a threshold value processing by a threshold value element 9 or a limiter amplifier. Also, the phases of signals for indicating the change amount (difference) of Manchester encoded input optical signal strength and the encoding clock can be compared. In such a manner, by comparing the phases of electric signals for indicating the Manchester encoded input optical signal strength or the change amount and the encoding clock and performing smoothing and the threshold value processing, the conversion to the NRZ code is performed without using the identifier of the double speed.

3. 发明专利

JPH11177506A OPTICAL RECEIVER 失效
公开(公告)号：JPH11177506A
公开(公告)日：1999-07-02
申请号：JP33693597
申请日：1997-12-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： SHIBATA YASUO , YAMADA YOSHIRO
IPC分类号： H04B10/60 , H04B10/07 , H04B10/2507 , H04B10/294 , H04B10/40 , H04B10/50 , H04B10/524 , H04B10/54 , H04B10/556 , H04B10/564 , H04B10/66 , H04B10/28 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26
摘要： PROBLEM TO BE SOLVED: To identify and recover a signal having high speed level fluctuation or offset fluctuation. SOLUTION: The optical receiver is provided with a semiconductor optical amplifier 2 whose gain is saturated with respect to a mean optical signal intensity received to a pre-stage of a photoelectric converter 3. The optical amplifier 2 whose saturation output is smaller than that of an optical preamplifier 1 is provided between the optical preamplifier 1 and the photoelectric converter 3. Furthermore, a high pass filter 7 is provided between the photoelectric converter 3 and an identification device 6.

4. 发明专利

JPH10224403A OPTICAL PACKET SWITCH 失效
公开(公告)号：JPH10224403A
公开(公告)日：1998-08-21
申请号：JP1943797
申请日：1997-01-31
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA YOSHIRO
IPC分类号： H04B10/27 , H04B10/2557 , H04B10/291 , H04L12/931 , H04Q3/52 , H04Q11/04 , H04L12/56 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To provide an optical packet switch by which cross gain modulation in a semiconductor optical gate amplifier being a component of an optical buffer is avoided, deficiency in an amplification factor in a fiber type optical amplifier per one packet is reduced and the number of input lines is increased. SOLUTION: This packet switch is provided with N sets of optical packet transmitters TX1-TXN that detect a destination address of each packet received from N input lines and convert and transmit a carrier frequency of each packet to each destination address based on a conversion table given in advance, N sets of optical buffers Buf change an output time of a packet sent from the optical packet transmitters TX1-TXN in the unit of one packet, and a control circuit 3 that controls the optical packet transmitters TX1-TXN and the optical buffer Buf.

5. 发明专利

JPH08149071A OPTICAL RECEIVING DEVICE 失效
公开(公告)号：JPH08149071A
公开(公告)日：1996-06-07
申请号：JP28842194
申请日：1994-11-22
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA YOSHIRO , MISAWA AKIRA , SASAYAMA KOJI
IPC分类号： H04B10/556 , H04B10/2507 , H04B10/02 , H04B10/00 , H04B10/18
摘要： PURPOSE: To identify and reproduce the signal that has the fast level fluctuation or offset fluctuation by reproducing the data inputted by a digital integrator that operates in response to the set pulse or reset pulse outputted from an identifier means. CONSTITUTION: When the difference is calculated by a differential amplifier 13 between a signal 1 and a signal 2 obtained by delaying the signal 1 by one bit, the output signal 3 of the amplifier 13 has a positive potential and a negative potential when the signal 1 changes to 1 from 0 and vice versa respectively. When the signal 1 has no change, the potential of the signal 3 is equal to zero. Thus the threshold value (a) of positive potential and the threshold value (b) of negative potential are set at the identifiers 15 and 16 respectively. Then the non-inverted output and the inverted output of both identifiers 15 and 16 are used as the set pulses 4 and the reset pulses 5 respectively. Furthermore the pulses 4 and 5 are inputted to a set terminal S and a reset terminal R of a digital integrator 17 respectively. Then the signal 3 whose edges are detected by both identifiers 15 and 16 is recovered into the original signal 1 by an integrator 17 and then identified and reproduced.

6. 发明专利

JPH07249818A FREQUENCY STABILIZATION METHOD OF FREQUENCY-VARIABLE SEMICONDUCTOR LASER 失效
公开(公告)号：JPH07249818A
公开(公告)日：1995-09-26
申请号：JP3723694
申请日：1994-03-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： YAMADA YOSHIRO , SASAYAMA KOJI
IPC分类号： H01S5/00 , H01S5/042 , H01S5/068 , H01S3/133 , H01S3/18
摘要： PURPOSE:To solve a problem of a thermal drift without using a frequency stabilization circuit and to stabilize an oscillation frequency in a high-speed changeover by a method wherein the combination of frequency control voltages at which the sum of heat capacities generated by the individual frequency control voltages becomes definite is selected and set. CONSTITUTION:The frequency-stabilizaiton method is provided with high-speed memories 111 to 11n in which pieces of information on (n) pieces of frequency-control electrodes for a frequency-variable laser 10 are stored and with D/A convertes 12 to 12 in which pieces of information read out from the individual high-speed memories are converted into frequency control voltages so as to be applied to the individual frequency control electrodes. Then, the combination of the frequency control voltages at which the sum of heat capacities becomes definite with reference to individual oscillation frequencies is decided by a procedure before an operation, and it is stored in the high-speed memories corresponding to the individual control electrodes. In the operation the oscillation frequencies are designated to the individual high-speed memories, and the combination of the frequency control voltages at which the sum of the heat capacities with reference to the oscillation frequencies becomes definite is given to the individual control voltages for the frequency-variable semiconductor laser 10.

7. 发明专利

JP2015092729A マルチレーン伝送システムにおける個別レーン監視方法审中-公开
公开(公告)号：JP2015092729A
公开(公告)日：2015-05-14
申请号：JP2014264806
申请日：2014-12-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUDOME KENJI , TEJIMA MITSUHIRO , YAMADA YOSHIRO , KITAMURA KEI
IPC分类号： H04L29/14 , H04L1/00 , H04L29/00
摘要：【課題】本発明は、レーン毎の品質を監視することを目的とする。【解決手段】本願発明のマルチレーン伝送システムにおける個別レーン監視方法は、フレーム形式の信号をデータブロックに分割して複数のレーンに分配して伝送するマルチレーン伝送における個別レーンのエラー数監視に関するものであり、特に、OTUフレーム1行目13列目及び14列目のOTU OHの予備領域又はOTUフレーム1行目5列目のFA OHにおけFASの一部をLM(Lane Monitoring)OHと定義し、レーンにおけるエラー検出用符号として前周期分のCRC−8を挿入して個別レーンのエラー数を監視する。【選択図】図7

8. 发明专利

JPH11266253A LIGHT CELL FRAME POSITION DETECTING DEVICE 失效
公开(公告)号：JPH11266253A
公开(公告)日：1999-09-28
申请号：JP6551798
申请日：1998-03-16
申请人： MITSUBISHI ELECTRIC CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： KAMIMURA ARITOMO , ICHIKAWA TOSHIYUKI , ISHIDA KAZUYUKI , YASUI NAOHIKO , YAMADA YOSHIRO
IPC分类号： G02F1/31 , H04B10/07 , H04B10/27 , H04B10/291 , H04B10/524 , H04J14/00 , H04J14/02 , H04L12/28 , H04L12/70 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To share the propagation delay time of a light cell signal and to dispense with detailed delay length adjustment by wavelength-multiplexing the light cell frame signal with the light cell signal and transmitting it through the same path. SOLUTION: An electric dell frame signal outputted from a signal source 105 and synchronized with a light cell frame is converted into a light cell frame signal by a light cell frame generating means 128, is subjected to wavelength- multiplexing with light cell signals produced by light transmitting means 101 to 104 in a light-merging means 106 and a transmitted. The light cell frame signal is propagated on an identical path as that of a light cell signal as wavelength-multiplexed light, is amplified by a light amplifying means 107, reaches a branching means 132 with the same delay and is branched by an optical coupler 129 in the means 132 and after that, only the light cell frame signal is separated by a light filter 130. On the other hand, the light cell signal opens and closes optical gate means 112 to 115 and 123 to 126, performs cell position replacement on a time base and wavelength filtering processing and is outputted from a system.

9. 发明专利

JPH10229239A METHOD FOR DRIVING VARIABLE WAVELENGTH SEMICONDUCTOR LASER AND VARIABLE WAVELENGTH LIGHT SOURCE DEVICE 失效
公开(公告)号：JPH10229239A
公开(公告)日：1998-08-25
申请号：JP3026797
申请日：1997-02-14
申请人： NEC CORP , NIPPON TELEGRAPH & TELEPHONE
发明人： KATO TOMOAKI , YAMADA YOSHIRO
IPC分类号： H01S5/06 , H01S5/042 , H01S5/0625 , H01S3/103
摘要： PROBLEM TO BE SOLVED: To suppress the wavelength instability of a variable wavelength semiconductor laser, caused by the hopping of an oscillation axial mode which occurs when the single axial mode laser oscillation wavelength of the semiconductor laser is switched. SOLUTION: When the oscillation mode of a variable wavelength semiconductor laser, having an active region and a wavelength control region is switched to a single axial mode laser oscillation wavelength λ2 from a single axial mode laser oscillation wavelength λ1, a waveform control current (λ-Control) is switched to I2 from I1. In the moments before and after the switching is performed, the current flowing to the active region (active) is made smaller than all threshold currents ITH in the oscillation axial mode which exist between the wavelengths, so as to stop the single axial mode laser oscillation of the semiconductor laser by at least a period of time longer than the lives of carriers in the wavelength control region.

10. 发明专利

JP2015092728A マルチレーン伝送システム及びその帯域変更方法审中-公开
公开(公告)号：JP2015092728A
公开(公告)日：2015-05-14
申请号：JP2014264778
申请日：2014-12-26
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KUDOME KENJI , TEJIMA MITSUHIRO , YAMADA YOSHIRO , KITAMURA KEI
IPC分类号： H04L7/00 , H04L12/841 , H04L12/911 , H04L29/00
摘要：【課題】本発明は、レイテンシの増大なしに帯域を増加させることを目的とする。【解決手段】本発明は、フレーム形式の信号をデータブロックに分割して複数のレーンに分配して伝送するマルチレーン伝送におけるレーン数増加時の遅延補償に関するものであり、特に、既存レーンのフレームの同期パターンおよびフレーム番号を含むデータブロックの複製を新規レーンで予め伝送し、同一のフレーム番号に対する同期パターンの遅延を比較し、既存レーンにおける同期パターンの遅延の方が大きい場合は、当該新規レーンに遅延の差分を与え、新規レーンにおける同期パターンの遅延の方が大きい場合は、既存レーンに遅延の差分を与えて既存レーンと新規レーンの遅延差を補償した後に、当該マルチレーン伝送の送信側において当該データブロックを分配するレーン数を変更する。【選択図】図8

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