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    OPTICAL COMMUNICATION SYSTEM FOR CONNECTING BOTH SIGNALS IN SPEECH BAND AND BASE BAND
    1.
    发明专利
    OPTICAL COMMUNICATION SYSTEM FOR CONNECTING BOTH SIGNALS IN SPEECH BAND AND BASE BAND 失效

    公开(公告)号：JP2000244393A

    公开(公告)日：2000-09-08

    申请号：JP35717099

    申请日：1999-12-16

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHAND NARESH ,  THOMAS HENRY DOHERTY ,  PETER D MAJIRU ,  VENKATARAMAN SUWAMINASAN

    IPC: H04B10/50 ,  H04B10/516 ,  H04B10/556 ,  H04J1/00 ,  H04J14/02 ,  H04L27/18 ,  H04N7/22 ,  H04B10/00

    Abstract: PROBLEM TO BE SOLVED: To provide a new communication system supplying a multi-channel broadcast digital service to each user by a broadcast video signal superposed on a speech band higher than a digital base band 155 Mbps signal. SOLUTION: An electric output obtained by combining a base band signal from a base band source 27 and a signal from a speech band source 28 by a system generating no overlapping of frequency in both of them by a diplexer 29 is convert-formed to be an optical signal by a laser transmitter 31 e.g. to send to an optical output splitter 33 through an optical transmission fiber 32. The splitter divides the sent signal into plural optical signals each similar with respect to the spectrum and sends them to each optical receiver 35 of an end user through a fiber 35. The optical receiver detects both of the base band signal impressed to incoming light and a speech band signal and demodulates them. Thus, a desired service is provided to a user by one transmitter, a single fiber path and one receiver.

    METHOD OF MAKING III/V SEMICONDUCTOR LASER
    2.
    发明专利
    METHOD OF MAKING III/V SEMICONDUCTOR LASER 失效

    公开(公告)号：JPH1027942A

    公开(公告)日：1998-01-27

    申请号：JP8254197

    申请日：1997-04-01

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHAND NARESH ,  CHU SUNG-NEE GEORGE ,  SYRBU ALEXEI V

    IPC: H01S5/00 ,  H01S5/02 ,  H01S3/18

    Abstract: PROBLEM TO BE SOLVED: To provide a method of making III/V semiconductor lasers having a mirror facet and a uniform cavity length. SOLUTION: This novel method of making III/V semiconductor lasers involves cleaving of the wafer along predetermined cleavage planes. A cleavage plane is determined by means of aligned non-continuous depressions 51 to 53. The depressions are spaced from the laser contact regions, and typically are V- grooves produced by photolithography and anisotropic etching. A further surface feature, typically a precisely positioned scribe mark, facilitates cleavage initiation. When carried out in vacuum, the novel method can provide high quality, accurately positioned cleavage surfaces, and consequently can facilitate increased yield of high power lasers.

    OPTICAL COMMUNICATION SYSTEM FOR OPTICALLY COMBINING BOTH OF BASE BAND SIGNAL AND PASS BAND SIGNAL
    3.
    发明专利
    OPTICAL COMMUNICATION SYSTEM FOR OPTICALLY COMBINING BOTH OF BASE BAND SIGNAL AND PASS BAND SIGNAL 失效

    公开(公告)号：JP2001077795A

    公开(公告)日：2001-03-23

    申请号：JP2000236353

    申请日：2000-08-04

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： VENKATARAMAN SUWAMINASAN ,  PARK YONG-KWAN ,  CHAND NARESH ,  DAUGHERTY THOMAS HENRY ,  MUYS WOULTERUS

    IPC: H04N7/22 ,  H04B10/272 ,  H04B10/50 ,  H04J14/00 ,  H04J14/02 ,  H04J14/04 ,  H04J14/06

    Abstract: PROBLEM TO BE SOLVED: To obtain a system capable of distributing an additional band width exceeding 1 Gbps to each subscriber by optically combining a base band signal and a pass band signal and transmitting the combined signal through a common optical fiber. SOLUTION: A system 30 is provided with a first light transmitter 40 for responding to an inputted electric base band signal from a base band source 28 and a second light transmitter 41 for responding to an inputted electric pass band signal from a pass band source 29. The transmitters 40 and 41 separately generate optical signals including information on the inputted signal of each. Next, an optical coupler such as an optical power coupler 42 optically combines the optical signals to transmit the combined optical signals to a light receiver 35, which is capable of detecting and demodulating both of the base band signal and the pass band signal. The receiver 35 is also capable of executing the electricity/light conversion of the pass band signal deeper in a network to allow a central station to provide an optical pass band signal.

    DEVICE INCLUDING SEMICONDUCTOR LASER, AND MANUFACTURE OF LASER
    4.
    发明专利
    DEVICE INCLUDING SEMICONDUCTOR LASER, AND MANUFACTURE OF LASER 失效

    公开(公告)号：JPH09167880A

    公开(公告)日：1997-06-24

    申请号：JP29620396

    申请日：1996-11-08

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHAND NARESH

    IPC: H01S3/10 ,  H01S3/06 ,  H01S5/00 ,  H01S5/02 ,  H01S5/028 ,  H01S5/16 ,  H01S3/18

    Abstract: PROBLEM TO BE SOLVED: To easily improve a passivating treatment by a method wherein a laser facet is covered with a passivation layer as kept free from contamination, and the passivation layer is made to contain an element selected from an element group of Mg, Zn and Hg and another element selected from another element group of S, Se and Te. SOLUTION: An N-side metallized layer 11, an N-GaAs substrate 12, an N-GaAs buffer layer 13, an N-InGaP clad layer 14, a GaAs spacer layer 15, an InGaAs quantum well layer 16, a GaAs spacer layer 17, a P-InGaP clad layer 18, and a P-GaAs etching stop layer are successively laminated, and furthermore a dielectric layer 20 and a metallize layer 21 are deposited for the formation of a laser facet 10. The laser facet 10 is covered with passivation layers 22 and 24 keeping free from contamination, and the passivation layers 22 and 24 are made to contain an element selected from an element group of Mg, Zn and Hg and another element selected from another element group of S, Se and Te. Dielectric layers 23 and 25 are laminated on the passivation layers 22 and 24.

    5.
    发明专利
    未知

    公开(公告)号：DE60034281T2

    公开(公告)日：2007-12-20

    申请号：DE60034281

    申请日：2000-07-24

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHAND NARESH ,  DAUGHERTY THOMAS HENRY ,  MUYS WOULTERUS ,  PARK YONG-KWAN ,  SWAMINATHAN VENKATARAMAN

    IPC: H04N7/22 ,  H04B10/272 ,  H04B10/50 ,  H04J14/00 ,  H04J14/02 ,  H04J14/04 ,  H04J14/06

    Abstract: A new communication system in which multichannel broadcast digital services are distributed to each user with the broadcast services signal riding in the passband above a digital baseband signal, can deliver more than 1 Gbps additional bandwidth to each subscriber. The passband bandwidth will accommodate growth in downstream services including video on demand, higher speed web downloads including improved streaming audio and video, HDTV, interactive video, and personalized video. The invention requires only a single fiber path and a single optical receiver for each user or group of users. A single fiber, single optical receiver system is much less expensive than two systems, one transmitting baseband and the other passband. A single receiver is greatly cost beneficial to achieving economical fiber to the home.

    OPTICAL COMMUNICATION SYSTEM COMBINING BOTH BASEBAND AND PASSBAND SIGNALS
    6.
    发明专利
    OPTICAL COMMUNICATION SYSTEM COMBINING BOTH BASEBAND AND PASSBAND SIGNALS 未知

    公开(公告)号：CA2291917A1

    公开(公告)日：2000-06-16

    申请号：CA2291917

    申请日：1999-12-07

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： SWAMINATHAN VENKATARAMAN ,  MAGILL PETER D ,  CHAND NARESH ,  DAUGHERTY THOMAS HENRY

    IPC: H04B10/50 ,  H04B10/516 ,  H04B10/556 ,  H04J1/00 ,  H04J14/02 ,  H04L27/18 ,  H04N7/22 ,  H04B10/20

    Abstract: This invention is a new communication system in which multichannel broadcast digital services are distributed to each user with the broadcast video signal riding in the passband above a digital baseband signal. The system can deliver more than 1 Gbps additional bandwidth to each subscriber. The passband bandwidth will accommodate growth in downstream services including video on demand, higher speed web downloads including improved streaming audio and video, HDTV, interactive video, and personalized video. The invention requires only a single transmitter, a single transmission fiber and a single receiver for each user. A single transmitter, single fiber, single receiver system is much less expensive than two systems, one transmitting baseband and the other passband. A single receiver is greatly cost beneficial to achieving an economical fiber to the home solution where equipment at the end user location is not shared among multiple end users. In an exemplary embodiment, an optical communication system comprises a diplexer for electronically combining the baseband and passband signals, a digital laser transmitter for generating an optical signal containing the combined signals, a length of optical transmission fiber for transmitting the optical signal, and, for each user or group of users, an optical receiver coupled to the fiber.

    8.
    发明专利
    未知

    公开(公告)号：DE60034281D1

    公开(公告)日：2007-05-24

    申请号：DE60034281

    申请日：2000-07-24

    Applicant: LUCENT TECHNOLOGIES INC

    Inventor： CHAND NARESH ,  DAUGHERTY THOMAS HENRY ,  MUYS WOULTERUS ,  PARK YONG-KWAN ,  SWAMINATHAN VENKATARAMAN

    IPC: H04N7/22 ,  H04B10/272 ,  H04B10/50 ,  H04J14/00 ,  H04J14/02 ,  H04J14/04 ,  H04J14/06

    Abstract: A new communication system in which multichannel broadcast digital services are distributed to each user with the broadcast services signal riding in the passband above a digital baseband signal, can deliver more than 1 Gbps additional bandwidth to each subscriber. The passband bandwidth will accommodate growth in downstream services including video on demand, higher speed web downloads including improved streaming audio and video, HDTV, interactive video, and personalized video. The invention requires only a single fiber path and a single optical receiver for each user or group of users. A single fiber, single optical receiver system is much less expensive than two systems, one transmitting baseband and the other passband. A single receiver is greatly cost beneficial to achieving economical fiber to the home.

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