-
公开(公告)号：JPH08271810A
公开(公告)日：1996-10-18
申请号：JP9174496
申请日：1996-03-22
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： JIYAMUPAORO BENDETSURI , ROBERUTO RAANO
Abstract: PROBLEM TO BE SOLVED: To provide a tunable addition-extraction multiplexer having an excellent extinction ratio in reflection. SOLUTION: This device 10 includes a pair of interference filters 11, 12 that are nominally the same, and one filter performs a function of drawing out carrier wave from wavelength split multiple streams, while the other filter performs an inserting function. The filters 11, 12 are arranged within planes parallel to each other so that the streams go out from the device 10 even after being reflected by both filters, and fixed to both opposed faces of a transparent plate 13. The transparent plate 13 is mounted on a support body 14, and this support body 14 can be rotated in both directions in order to change the tuning wavelength of the filters 11, 12.
-
公开(公告)号：JPH08234248A
公开(公告)日：1996-09-13
申请号：JP35089095
申请日：1995-12-25
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： DOMINIKO KAMUPI
Abstract: PROBLEM TO BE SOLVED: To enable operation at an ultra-high bit rate by applying the constitution that a nonlinear structural body formed out of a quantum well defining a boundary with a confined layer, and a large-sized layer operates as a dilution and re-coupling tank for a carrier removed with the structural body. SOLUTION: Regarding an optical element including a plate of semiconductor material forming a series of layers with impurities added, and allowing the transmission of a light radiation through the layers during operation, an InP layers 1 and 3, and an InGaAs layer 2 form a structural body for giving the non-linearity of an exciton. Furthermore, an InGaAsP layer 4 operates as a dilution and re-coupling tank, and the InGaAs layer 2 and the InGaAsP layer 4 form different sizes of quantum wells. The InP layers 1 and 3 form a confined layer. The structural bodies (layers 1 to 3) for giving the non-linearity of the excition are arranged geometrically near the InGaAsP layer 4 having a larger size.
-
公开(公告)号：JPH08102602A
公开(公告)日：1996-04-16
申请号：JP16680495
申请日：1995-06-08
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： JIYORUJIYO BERUCHIN , RUCHIANO ATSUKACHIINO
Abstract: PURPOSE: To provide a narrow band filter that does not have so much loss by tilting the side of a middle part consisting of rectangular waveguides against planes of polarization including an iris at an appropriate angle and cascading them. CONSTITUTION: Each cavity resonator consists of three waveguide parts which are cascaded and arranged on the same axis, that is, a circular cross-section waveguide whose one end is closed with a circular bottom plane, a rectangular cross-section waveguide and further a circular cross-section waveguide whose one end is closed with a circular bottom plane. In such cases, two terminating parts CC1 to CC4 maintain two modes which have linear polarization that is in parallel with or vertical to planes including irises IR1 to IR3, and the sides of middle parts CR1 and CR2 which consist of waveguides having a rectangular cross-section are tilted against planes that include the irises IR1 to IR3 at an appropriate angle. Two orthogonal modes in each cavity resonators are directly connected through rectangular waveguide parts CR1 and CR2. Then, it is possible to obtain a filter that has an elliptic transfer function.
-
公开(公告)号：JPH07221708A
公开(公告)日：1995-08-18
申请号：JP33423194
申请日：1994-12-16
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： PIERO GAMUBIINI , EMIRIO BUETSUTSUOONI
Abstract: PURPOSE: To compensate the delay caused by possible difference in optical routes in a node by utilizing dispersion dependence on wavelength in an optical fiber. CONSTITUTION: In an optical ATM node, a synchronized ATM cell is sent into the segment of an optical fiber (FD) having high time dispersion and a prescribed length. ATM cell transmission is performed after the cell is converted into such an optical carrier at a tunable wavelength converter (CL) that reaches the input sides of the switching elements (Em1,..., Emh) of a node (NC) at a prescribed moment as a result of the fact that the cell has a wavelength different from the original wavelength of the cell and passes through the optical fiber (FD).
-
公开(公告)号：JPH07154372A
公开(公告)日：1995-06-16
申请号：JP19896994
申请日：1994-08-02
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： RITSUKARUDO KARUBUAANI , EMIRIO BUETSUTSUOONI
Abstract: PURPOSE: To operate optical carrier extracting and reinserting equipment without relying upon polarization by making the equipment applicable to a wavelength division system by using a filter which can be adjusted finely for wavelength. CONSTITUTION: Various kinds of carriers existing at the branch 1e of a transmission line reach a fiber section after passing through the ports P1 and P3 of a circulator C1. A filter FP passes carriers having a wavelength and the carriers reach a receiver Rxi through a fiber 5. Carriers having the another wavelength are reflected by the filter FP and reach the output branch 1u of the transmission line through the ports P3 and P2 of the circulator C1. Similarly, carriers λwhich are transmitted from a transmitter and rely upon the input 3 of another circulator C2 pass through the filter FP in the reflecting direction and are inserted into a wavelength division multiplexing system at the output 1u of optical carrier extracting and reinserting equipment along a route (the ports P1' and P3' of the circulator C2, the fiber 5, and ports P3 and P2 of the circulator C1).
-
Patent Agency Ranking
公开(公告)号：JPH0670385A
公开(公告)日：1994-03-11
申请号：JP16376793
申请日：1993-06-10
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： BURUUNO BOSUTEIKA , PAORA SHINATO , ARUFUREDO DE BOSHIO
Abstract: PURPOSE: To provide an optical switch which can completely use the performance of an optical component and utilizes a flow of information even at a very high speed inside even when an electronic control part exists. CONSTITUTION: An optical switch for a high-speed cell switching network consists of an optical mutual connection network(CM) and an electric control network (CT). In order to sufficiently make sufficient use of optical constituent element performance and to overcome restrictions imposed by an operating speed limit of an electric constituent element, respective inputs (IN1 to INk) of the mutual connection network (CM) form a basic group of cells which are expected to pass through the same path through the mutual connection network, the basic group is related to a means (PAC1 to PACk) for time compression and respective outputs (OUT1 to OUk) are related to a means (PAD1 to PADk) for time expansion of the basic group and separation of collective cells.
-
67.发明专利
公开(公告)号：JPH05191353A
公开(公告)日：1993-07-30
申请号：JP19741992
申请日：1992-07-02
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： RITSUKARUDO KARUBAANI , RENAATO KAPONI , JIYUZETSUPE MAROONE
IPC: G02F2/00 , H04B10/04 , H04B10/06 , H04B10/135 , H04B10/142 , H04B10/152
Abstract: PURPOSE: To constitute a system transmitter or a local oscillator by two sources of light beam by synthesizing orthogonally polarized light beams generated from two independent sources of light beam and with different frequencies each other. CONSTITUTION: Two semiconductor lasers 1, 2 approximated to each other at the most are connected to a binary data flow source 3 and the two lasers 1, 2 are frequency modulated by the flow source 3. Then signals from the flow source 3 are supplied to controllers 4, 5 of the laser 1, 2 and each signal is superimposed on DC exciting voltage VB1, VB2. Each laser is oscillated by the signal with four frequencies corresponding to a logic value of a binary signal. In this case, the linearly polarized light beam generated from the laser 1 is transmitted to a polarized beam splitter 7, light is received on a transmitted surface and the light beam from the laser 2 is received on a reflecting surface. The light beam becomes the orthogonally polarized light beams with different frequencies each other, the light beams are synthesized and transmitted onto a transmission line 12. Then the linear polarization rotating by 360 degrees is obtained and the system transmitter or the local oscillator is constituted.
-
公开(公告)号：JPH0555681A
公开(公告)日：1993-03-05
申请号：JP35286091
申请日：1991-12-17
Applicant: CSELT CENTRO STUDI LAB TELECOM
IPC: H01S5/06 , H01S5/062 , H01S5/0683 , H01S5/40
Abstract: PURPOSE: To obtain in particular a modulated optical signal generating method and a device in an optical fiber communication system, using the sub-carrier wave of a radio frequency or a microwave frequency. CONSTITUTION: This is a modulated optical signal generation system, and the variety of currents obtained by detecting an optical signal based on the combination of an optical signal, an amplitude modulated input signal, and an optical signal appearing in a feedback circuit is overlapped on the DC bias currents of a semiconductor laser 1 related with an optical/electric feedback circuit 2 having delays. A laser output signal is amplitude-modulated by a frequency equal to the modulation frequency f2 of the input signal by the proper selection of the modulation frequency f2 of the input signal and a low frequency gain B of the feedback loop 2.
-
69.发明专利
公开(公告)号：JPH04251228A
公开(公告)日：1992-09-07
申请号：JP17778191
申请日：1991-06-24
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： RIKARUDO KARUBAANI , RENAATO KAPONII
Abstract: PURPOSE: To decide the angle coefficient of a phase straight line, and also to obtain a non-linear refractive coefficient from the angle coefficient, cavity length and the wave length of an exciting signal by identifying the saturation and the mitigation area of a hysteresis loop where the phase of an optical signal electromagnetic field in a cavity resonator is the linear function of output power, storing the values of an output and an input related to the area and obtaining the phase of the area from the value of storage power. CONSTITUTION: An optical beam which is outputted from an acoustooptical device 6 and modulated in terms of sine wave from a semi-conductor laser 3 with an isolator 5 is divided by a beam splitter 8, a reflection beam decides input signal strength by an optical detector 15, an amplifier 16 and a memory oscilloscope 11 and a transmissive beam adds a material to be measured or the cavity resonating equipment itself 1 is irradiated with it. The strength of the transmissive beam from 1 is detected by the oscilloscope 11 by way of the optical detecting equipment 9 and that of the reflection wave from 1 is detected by the second oscilloscope 14 by way of the optical detecting equipment 12. Desired data is obtained by the combination of the measurement values.
-
公开(公告)号：JPH02275411A
公开(公告)日：1990-11-09
申请号：JP857590
申请日：1990-01-19
Applicant: CSELT CENTRO STUDI LAB TELECOM
Inventor： RIKARUDO KARUBUANI , RENATO KAPONI , JIYUZETSUPE MAROONE
IPC: G02F1/03 , G02F1/035 , G02F1/31 , G02F1/313 , H04B10/135
Abstract: PURPOSE: To obtain a polarized light modulator having simple structure, compact size and high speed operation by receiving light from a 1st or 2nd passage by a 1st or 2nd input part, transmitting the received light to an output part and changing the polarized state of a modulation signal consisting of output light in accordance with the level of a data signal. CONSTITUTION: Horizontally polarized light oscillated in a horizontal surface is inputted from an input part P1 to a switch 6 and outputted from an output part P2 or P4. In this case, the light is outputted from the output part P2 or P4 in accordance with the logical value '0' or '1' of a sequence bit outputted from an encoder 7. The state of polarized light outputted from the output part is always the same as polarized light state of a signal inputted to the input part of the switch 6. Namely vertically polarized light or horizontally polarized light is outputted in accordance with the logical value '0' or '1' of the sequence bit of information. The obtained polarized modulation signal is demodulated by a receiver in a communication system. Consequently the polarized light modulator having simple and compact size and extremely short switching time can transmit a signal at a transmission speed of G bits/sec.
-
-
-
-
-
-
-
-
-
Search Results
2639
records
(took 0.029 seconds)
