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    Variable gain optical amplifier
    3.
    发明专利
    Variable gain optical amplifier 有权

    公开(公告)号：JP2009537073A

    公开(公告)日：2009-10-22

    申请号：JP2009508508

    申请日：2007-05-11

    Applicant: ブックハム テクノロジー パブリック リミテッド カンパニーBookham Technology Plc

    Inventor： スチュアート ドレイク，ジョナサン ,  デイビッド フォーテ，ステファン ,  フリンサム，バリー ,  ピーター マクリーン，イアン

    IPC: H01S3/10 ,  H01S3/06 ,  H04B10/296

    CPC classification number: H01S3/1301 ,  H01S3/06754 ,  H01S3/1305 ,  H04B10/296

    Abstract: 可変ゲイン光増幅器は、異なる波長の光信号を増幅するＥＤＦＡと、ＥＤＦＡを駆動して光ゲインを提供するポンプ駆動部１４とを有する。 ＥＤＦＡへの入力信号の強度Ｐｉｎを測定する入力検出器２が備えられ、ＥＤＦＡからの出力信号の強度Ｐｏｕｔを測定する出力検出器３が備えられる。 測定された入力強度Ｐｉｎに基づくフィードフォワード信号を提供するフィードフォワード構造２０，２１，２２，２３、および測定された出力強度Ｐｏｕｔに基づくフィードバック信号を提供するフィードバック構造５，６，７，８，９，３０を含み、ポンプ駆動部１４に駆動信号を与えて光ゲインを制御するゲイン制御構造が備えられる。 速やかなゲイン制御を確保するために、フィードバック構造は、要求されるゲインプロフィルに対応し、少なくとも一方が測定された出力強度Ｐｏｕｔに従って動的に可変である比例制御係数Ｋｐおよび積分制御係数Ｋｉに従って、要求されるゲイン設定点において光ゲインを制御する適応比例−積分（ＰＩまたはＰＩＤ）制御器３０を有し、制御器３０からの出力信号とフィードフォワード信号とが、加算器３１において加算されて、ポンプ駆動部１４への駆動信号が生成される。

    Tunable demultiplexer that follows wavelength variations due to temperature
    5.
    发明专利
    Tunable demultiplexer that follows wavelength variations due to temperature 未知

    公开(公告)号：GB2360653A

    公开(公告)日：2001-09-26

    申请号：GB0002513

    申请日：2000-02-03

    Applicant: BOOKHAM TECHNOLOGY LTD ,  BOOKHAM TECHNOLOGY PLC

    Inventor： BESTWICK TIMOTHY DAVID ,  HARPIN ARNOLD PETER ROSCOE

    IPC: H04B10/50 ,  H04B10/572 ,  H04J14/02 ,  H04B10/145

    Abstract: A point to point optical link from a transmitter (1) to, a receiver (2) via an optical fibre (3), the transmitter (1) comprising light sources (4) providing signals of different wavelengths and a multiplexer (6) combining the signals onto a single channel for transmission along the optical fibre (3), and the receiver (2) comprising light sensors (8) and a demultiplexer (10) for separating the signals of different wavelengths and directing each to a respective light sensor (8). The output of the transmitter (1) is temperature dependent but arranged so that the change in wavelength with respect to temperature for each of the signals is similar, and the demultiplexer (10) being adjustable so that its response to signals with respect to their wavelength can be actively tuned so as to follow variations in the wavelength of the signals received.

    A semiconductor laser amplifier using waveguides
    6.
    发明专利
    A semiconductor laser amplifier using waveguides 未知

    公开(公告)号：GB2353898A

    公开(公告)日：2001-03-07

    申请号：GB9920173

    申请日：1999-08-25

    Applicant: BOOKHAM TECHNOLOGY LTD ,  BOOKHAM TECHNOLOGY PLC

    Inventor： TOMLINSON ANDREW MICHAEL ,  KITCHER DANIEL JOHN

    IPC: H01S5/026 ,  H01S5/10 ,  H01S5/14 ,  H01S5/40 ,  H01S5/50 ,  H01L31/0232

    Abstract: A semiconductor laser has a semiconductor optical amplifier 11 with first and second semiconductor waveguides 18, 19. The first waveguide forms at least part of a first optical path in the amplifier between reflectors, and the second waveguide is optically coupled to the first waveguide in the optical amplifier. A laser output is connected to a second optical path formed at least in part by the second waveguide 19. Alternatively, one of the reflectors may be a reflective grating 25 which provides substantially total reflection. One of the reflectors in the amplifier may be provided by coating one end facets 20 of the optical amplifier in gold. The waveguides may be formed as part of an integrated semiconductor amplifier. The waveguides may be rib waveguides forming a four port evanescent coupler. The semiconductor amplifier 11 may a rectangular chip mounted in a recesss 12 in an integrated circuit optoelectronic device 13. The laser may be in the form of an external cavity arrangement or may be a distributed feedback laser.

    Optical phase modulator
    9.
    发明专利
    Optical phase modulator 未知

    公开(公告)号：GB2348293A

    公开(公告)日：2000-09-27

    申请号：GB9906976

    申请日：1999-03-25

    Applicant: BOOKHAM TECHNOLOGY LTD ,  BOOKHAM TECHNOLOGY PLC

    Inventor： HOUSE ANDREW ALAN

    IPC: G02F1/025 ,  G02F1/313

    Abstract: An optical phase modulator comprises a ribbed waveguide formed of silicon. The waveguide is doped to form a PN junction extending the length and height of the of the rib 12. Terminals 57, 59 are provided which enable a reverse bias to be applied to the PN junction and thereby extend the carrier depletion region 63 to alter the refractive index. The PN junction is offset from the centre of the rib, but the depletion zone 63 extends over the central axis 65 of the waveguide.

    A single wavelength bi-directional optical transceiver
    10.
    发明专利
    A single wavelength bi-directional optical transceiver 未知

    公开(公告)号：GB2347806A

    公开(公告)日：2000-09-13

    申请号：GB9905565

    申请日：1999-03-12

    Applicant: BOOKHAM TECHNOLOGY LTD ,  BOOKHAM TECHNOLOGY PLC

    Inventor： MORRIS ROBIN JEREMY RICHARD ,  RICKMAN ANDREW GEORGE ,  GORTON STEPHEN WARREN ,  MCCANN STEPHEN

    IPC: G02B6/12 ,  G02F1/313 ,  H04B10/25 ,  H04B10/24

    Abstract: An optical transceiver (1) for transmitting and receiving optical signals of the same wavelength comprising a light source, such as a laser diode (2) or a reflector (11), a light receiver such as a photodiode (3), and an input-output (4) for receiving light from and transmitting light to a bi-directional optical fibre (5). An optical switch (6), e.g. a Mach-Zehnder interferometer comprising one or more p-i-n diode phase modulators (9, 10), is provided to selectively provide optical communication between the light source (2, 11) the optical fibre (5) and between the optical fibre (5) and the light receiver (3) to provide low-loss paths therebetween. With a reflector (11) acting as the light source, the optical switch (6) can also be used to modulate the output of the transceiver. The optical transceiver (1) may be used in a home transceiver unit (24) connected to receive digital signals of a first wavelength and analog signals, e.g. for CATV, of a second wavelength from a central unit (31).

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