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1. 发明专利

JPH0611743A LIGHT PULSE AMPLIFIER DEVICE 失效
公开(公告)号：JPH0611743A
公开(公告)日：1994-01-21
申请号：JP17102692
申请日：1992-06-29
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： JINNO MASAHIKO
IPC分类号： G02F1/35
摘要： PURPOSE:To enable light pulse amplification with high efficiency and to eliminate the need for synchronization with an optical switch by disposing an element, the transmittance of which changes according to the instantaneous light intensity of input light between respective optical amplifiers thereby, removing natural releasing light. CONSTITUTION:This light pulse amplifier has the optical amplifier 31 to which an input light pulse array 1 is inputted, the optical amplifier 3n which outputs the amplified light pulse array 2, and an optical band-pass filter 4 which allows the transmission of only the wavelength of the light pulses and is provided with the nonlinear fiber loop mirror element 10 contg. an optical fiber 6 and consisting of an optical coupler 5 of a prescribed branching ratio. The element 10 has the high transmittance and introduce the light pulses to the optical amplifier 3 of the ensuing stage when the light pulses are made incident thereon. The element has the small transmittance and does not allow the transmission of natural release light when the light pulses do not exist and the input light is the continuous natural release light. Then, the optical gating of the time as short as about the width of the light pulses is attained and the closing and opening of the light gate and the synchronization of the light pulses are executed automatically.

2. 发明专利

JPH05346599A 失效
公开(公告)号：JPH05346599A
公开(公告)日：1993-12-27
申请号：JP17768992
申请日：1992-06-12
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： JINNO MASAHIKO
IPC分类号： G02F1/35 , H04B10/2507 , H04B10/29 , H04B10/40 , H04B10/50 , H04B10/524 , H04B10/54 , H04B10/58 , H04B10/60 , H04B10/04 , H04B10/06 , H04B10/18
摘要： PURPOSE:To obtain a fully optical type optical regenerating repeater which can operate at an extremely high speed without the speed limitation of electric circuitry. CONSTITUTION:This optical discriminating and reproducing device has a means which amplifies input light signal pulses, a multiplexing means 2 which multiplexes the input light signal pulses 1 and light clock pulses 3 synchronized with them, an optical nonlinear means 4 which is coupled with its output and has tertiary nonlinear effect, and a demultiplexing means 5 which demultiplexes a light signal generated as a result of 4-photon mixture by the nonlinear means from the input light signal pulses and light clock pulses 3; and the time relation between the both is so adjusted that the input light signal pulses are different in propagation speed from the light clock pulses in the optical nonlinear means and meet the light clock pulses almost in the center of the nonlinear means.

3. 发明专利

JPH04119317A OPTICAL DELAY CIRCUIT 失效
公开(公告)号：JPH04119317A
公开(公告)日：1992-04-20
申请号：JP23958190
申请日：1990-09-10
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： JINNO MASAHIKO
IPC分类号： G02B27/00 , G02F2/00 , H04B10/25 , H04B10/524 , H04B10/58 , H04B10/67
摘要： PURPOSE:To convert an ultra high speed photocell into a low speed light signal sequence in an asynchronous transfer mode network by cascading and connecting many stages of optical delay mechanisms each consisting of a 1-input, 2-output optical switch, two optical delay lines, and a 2-input, 1-output optical coupler. CONSTITUTION:On the transmission line of the photocell 1, many stages of the optical delay mechanisms each consisting of the 1-input, 2-output optical switch 2 which inputs the photocell 1 and control light pulses 5 synchronized with the photocell 1, the two optical delay lines 4 which delay the two outputs of the optical switch 2 properly, and the 2-input, 1-output optical coupler 3 which multiplexes the outputs of the optical delay lines 4 having the delay are cascaded. In this case, the photocell 1 is passed through this optical delay circuit and delayed in stages to obtain the light signal sequence 6 which has a low bit rate. Consequently, the ultra high speed photocell 11 can be converted into the low speed light signal sequence in the asynchronous transfer mode network.

4. 发明专利

JPH0277030A OPTICAL LOGIC CIRCUIT 失效
公开(公告)号：JPH0277030A
公开(公告)日：1990-03-16
申请号：JP16911088
申请日：1988-07-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： JINNO MASAHIKO , KOGA MASABUMI , MATSUMOTO TAKAO
IPC分类号： G02F3/00 , G02F3/02
摘要： PURPOSE:To enable exclusive OR, AND, and adding operations by providing a state separator which separates the output light of an optical multistable element and outputs it to respective output terminals. CONSTITUTION:A light input 11 which is inputted to the 1st input terminal of an optical multiplexer 13 and a light input 12 which is supplied to a 2nd input terminal are multiplexed and entered into an optical multistable semiconductor laser 14. The light output of the optical multistable semiconductor laser 14 is entered into a wavelength filter 15, branched according to the wavelength of the light output, and sent out from output terminals 16 and 17 as light outputs 18 and 19. Consequently, the exclusive OR, AND, and half-adding operations are performed by a simple optical system.

5. 发明专利

JPH01150121A OPTICAL CIRCUIT FOR SELF-TIMING EXTRACTION 失效
公开(公告)号：JPH01150121A
公开(公告)日：1989-06-13
申请号：JP31029187
申请日：1987-12-07
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： JINNO MASAHIKO , KOGA MASABUMI , MATSUMOTO TAKAO
IPC分类号： G02F1/35 , G02B6/28 , G02B6/34 , G02F3/00 , H04B10/00 , H04B10/2507 , H04B10/299 , H04B10/524 , H04B10/58 , H04L7/00 , H04L7/02
摘要： PURPOSE:To obtain an optical clock signal synchronized directly from an input optical signal and without having jitter by realizing an optical loop circuit consisting of an optical directional coupler and an optical delay element and furthermore, an optical band-pass filter with high Q value by using a light amplifier, and combining the filter with a light limiter. CONSTITUTION:The optical directional coupler 2 includes a second output port, and a branching means is included in the coupler 2, and branches the signal of a second input port to the second output port. The second output port is coupled with an optical limiter 5 via an optical waveguide 4 optically. The optical loop circuit 3 is constituted of the optical delay element, and length L is set at C/nT assuming the clock cycle of an input light signal as T. Where, C shows luminous flux, and (n) is the refractive index of the loop circuit 3. The optical BPF is formed by the coupler 2 and the loop 3. It is permitted to provide the light amplifier 6 on the loop 3. The amplifier 6 is a semiconductor laser whose injection current is suppressed less than an oscillation threshold value, and the optical limiter 5 is the semiconductor laser having an electrode bi-sected in the direction of a resonator. By constituting a circuit in such way, it is possible to extract the optical clock synchronized with input whose pulse strength is modulated.

6. 发明专利

JP2001008244A OPTICAL CROSS CONNECTING DEVICE, OPTICAL WAVELENGTH DIVISION-MULTIPLEXED NETWORK AND OPTICAL WAVELENGTH DIVISION-MULTIPLEXING METHOD 失效
公开(公告)号：JP2001008244A
公开(公告)日：2001-01-12
申请号：JP17339199
申请日：1999-06-18
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： JINNO MASAHIKO , HATTORI KUNINORI
IPC分类号： H04B10/27 , H04B10/00 , H04J14/00 , H04J14/02 , H04Q3/52 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To increase transmission capacity without increasing hardware by branching an inputted wavelength division-multiplexed optical signal into groups of wavelength with plural different wavelength carriers and routing them by optical switches. SOLUTION: Optical signals from respective input ports 4-1 to 4-n are separated into m-groups of wavelength with different wavelength by every input port 4-1 to 4-n by optical signal branching parts 2-1 to 2-n, m wavelength groups are routed by an optical switch 1-m. In addition, the optical switches 1-1 to 1-m in operation devices decide what inputted optical signal is routed to where. The routed optical signal is optical wavelength division-multiplexed by the optical signal branching parts 3-1 to 3-n and outputted from output ports 5-1 to 5-n. Namely, the routes of the optical signals with the wavelength belonging to the same group of wavelength are set by the same optical switch altogether. Since the optical switches 1-1 to 1-m are shared by the optical signal with the wavelength to constitute the groups of wavelength, the transmission capacity is increased without increase of m-pieces of optical switches.

7. 发明专利

JP2000089263A OPTICAL CIRCUIT AND NETWORK 失效
公开(公告)号：JP2000089263A
公开(公告)日：2000-03-31
申请号：JP33810998
申请日：1998-11-27
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HATTORI KUNINORI , FUKUI MASAKI , JINNO MASAHIKO
IPC分类号： G02F1/313 , H04B10/27 , H04B10/275 , H04B10/278 , H04B10/29 , H04B10/296 , H04Q3/52 , H04B10/02
摘要： PROBLEM TO BE SOLVED: To provide both an and/drop function and an optical attenuating function and moreover to suppress an insertion loss to the minimum and also to realize an optical attenuating operation which does not depend upon polarization and a high extinction ratio. SOLUTION: This circuit has a 2×2 variable optical branching and optical attenuating part 10 and an optical attenuating part 11. The 2×2 variable optical branching and optical attenuating part 10 functions as an optical attenuator with respect to a main input signal light passing from a main input port (1) to a main output port (4) and functions as an optical switch having a high extinction ratio in the exchanging of an add light and a drop light to output the drop light inputted from the main input port (1) to a drop port (3). The optical attenuating part 11 functions as an optical attenuator with respect to an add light to be inputted from an add port (2). The add light passed through the optical attenuating part 11 is inputted to the 2×2 variable optical branching and optical attenuating part 10 functioning as the optical switch and it is outputted to the main output port (4).

8. 发明专利

JPH11252050A WAVELENGTH DIVISION MULTIPLEX TYPE OPTICAL TRANSMISSION SYSTEM 失效
公开(公告)号：JPH11252050A
公开(公告)日：1999-09-17
申请号：JP5394298
申请日：1998-03-05
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： KANI JUNICHI , JINNO MASAHIKO , SAKAMOTO TADASHI
IPC分类号： H04J14/00 , H04B10/2507 , H04B10/2525 , H04B10/2537 , H04B10/2557 , H04B10/2563 , H04J14/02 , H04B10/02 , H04B10/18
摘要： PROBLEM TO BE SOLVED: To provide a wavelength division multiplex type optical transmission system for reducing degradation by Raman crosstalk and reducing the degradation by 4-optical-wave mixing even in the case of utilizing a wide band including a zero dispersion wavelength on a noon-zero dispersion shift fiber. SOLUTION: In this wavelength division multiplex type optical transmission system for performing the transmission and reception of welenght division multiplex signal light by optical transmitter-receivers 54 and 56 to a non-zero dispersion shift fiber transmission line 55 for which a zero dispersion wavelength is arranged approximately from 1566 nm to 1616 nm, the wavelength of the plural pieces of the signal light to be wavelength division multiplexed is arranged =1621 and the signal light is transmitted so as to propagate the signal light arranged =1621 nm though the non-zero dispersion shrift fiber transmission line 55 in opposite directions.

9. 发明专利

JPH0277024A OPTICAL SEPARATING CIRCUIT 失效
公开(公告)号：JPH0277024A
公开(公告)日：1990-03-16
申请号：JP16910988
申请日：1988-07-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： JINNO MASAHIKO , KOGA MASABUMI , MATSUMOTO TAKAO
IPC分类号： G02F1/31 , G02F1/35 , G02F3/02
摘要： PURPOSE:To separate necessary signal light from a time-division multiplex digital signal sequence under optical control by using an optical multi-stable element and a state separator. CONSTITUTION:A digital signal light sequence 11 which is inputted to a 1st input terminal and control light 12 which is synchronized with signal light to be separated from the digital signal light sequence 11 are multiplexed by an optical multiplexer 13 and entered into an optical multi-stable semiconductor laser 14. Its light output is made incident on a wavelength filter 15, the optical multi-stable semiconductor laser 14 does not oscillates regardless of the input of the control light 12 when the signal light 11 is '0', and its output is '0'. When only the signal light 11 is inputted, on the other hand, the laser oscillates with 1st wavelength and its output appears at an output terminal 16 where only the 1st wavelength of the wavelength filter 15 is passed. Further, when the signal light 11 and control light 12 are made incident at the same time, the laser oscillates with 2nd wavelength and its output is sent out through an output terminal 17 where only the 2nd wavelength of the wavelength filter 15 is passed. Consequently, the necessary light signal is separated under the optical control.

10. 发明专利

JPH11174389A OPTICAL PROCESSING CIRCUIT 失效
公开(公告)号：JPH11174389A
公开(公告)日：1999-07-02
申请号：JP33676097
申请日：1997-12-08
申请人： NIPPON TELEGRAPH & TELEPHONE
发明人： HATTORI KUNINORI , FUKUI MASAKI , JINNO MASAHIKO
IPC分类号： G02B6/12 , G02F1/01 , G02F1/313 , H01S1/00 , H04J14/00 , H04J14/02
摘要： PROBLEM TO BE SOLVED: To provide an optical processing circuit which has both an add/drop function and a light attenuating function matching with an OADN ring system by composing the optical processing circuit of one circulator, one 1×N multiplexer demultiplexer, and N plane type light guide circuits. SOLUTION: In signal light passing operation, a phase adjusting mechanism SW1 of the optical processing circuit A (plane type light guide circuit) adjusts a phase beforehand and the path of a 2×2 switch is fixed in a through state having the path connected to an output waveguide facing an input waveguide. Then signal light which is multiplexed with N waves by passing through an optical fiber 2 for input and a preamplifier 1 passes through a circulator 3 and propagated to and demultiplexed by the 1×N multiplexer demultiplexer 4, and then the light is made incident on an I/O port I of a Mach-Zehnder interferometer, propagated to an output waveguide at a through port, and then returned by a high-reflection mirror 6 arranged behind to return the I/O port I at the through port. This constitution can minimize the circuit size.

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