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8 条记录 (耗时 0.008 秒)

    OPTICAL RECEIVER
    1.
    发明公开
    OPTICAL RECEIVER 有权
    光接收机

    公开(公告)号：EP2696519A4

    公开(公告)日：2014-09-24

    申请号：EP11863096

    申请日：2011-04-05

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： NODA MASAKI ,  NOGAMI MASAMICHI ,  NAKAGAWA JUNICHI

    IPC分类号： H04B10/69 ,  H04B10/29 ,  H04B10/60

    CPC分类号： H04B10/6931 ,  H03G3/3084 ,  H04B10/693

    摘要： The present invention is an optical receiver includes: a preamplifier (2) capable of changing a conversion gain in accordance with a reception level of a received burst signal; a gain control circuit (9) capable of switching between a fast time constant and a slow time constant; and a convergence determination circuit (10) for outputting a time constant switching signal (14) in accordance with a state of the gain control circuit (9) (transient state or steady state) and a reset signal between the burst signals. This configuration can switch the time constant of the gain control circuit (9) at an appropriate timing.

    CIRCUIT FOR VARYING GAIN OF PREAMPLIFIER
    3.
    发明公开
    CIRCUIT FOR VARYING GAIN OF PREAMPLIFIER 有权
    电路变革，加强前置放大器

    公开(公告)号：EP1653607A4

    公开(公告)日：2008-05-28

    申请号：EP03817770

    申请日：2003-07-30

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： NOGAMI MASAMICHI ,  NODA MASAKI ,  TAGAMI HITOYUKI ,  MOTOSHIMA KUNIAKI

    IPC分类号： H03G3/20 ,  H03F3/08 ,  H03G3/30

    CPC分类号： H03G3/3084 ,  H03F3/08 ,  H03G1/0047 ,  H03G2201/103 ,  H03G2201/502 ,  H04B10/69

    摘要： A photodetector (1) converts an optical signal in the form of a burst into an electrical signal and outputs an output current, and a preamplifier (2) having a feedback resistive element (2B) amplifies the output current and outputs a voltage signal. The feedback resistive element (2B), a series circuit of a first resistive element (6) and a first switching element (9), and a series circuit of a second resistive element (7) and a second switching element (10) are connected in parallel to a gain varying circuit (3) for varying the conversion gain of the preamplifier (2). The gain varying circuit (3) generates an operation signal to close the first switching element 9 during a first gain varying period and an operation signal to close the second switching element (10) during a second gain varying period.

    PREAMPLIFIER
    4.
    发明公开
    PREAMPLIFIER 有权
    前置放大器

    公开(公告)号：EP1619792A4

    公开(公告)日：2006-03-22

    申请号：EP04723359

    申请日：2004-03-25

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： NODA MASAKI

    IPC分类号： H03F1/34 ,  H03F3/08

    CPC分类号： H03F3/08 ,  H03F1/34 ,  H03F3/082

    摘要： A preamplifier comprises negative feedback amplifying circuits (2, 3) for converting the output current signal from a light receiving element (6) into a voltage signal, and conversion gain control circuits (10, 11a, 11b) for simultaneously controlling the resistance at the feedback resistance part (4) of the negative feedback amplifying circuits (2, 3) and the resistance at the load resistance part (5) of the negative feedback amplifying circuits (2, 3) according to the output voltage signal outputted from the negative feedback amplifying circuits (2, 3). Furthermore, the feedback resistance part (4) and the load resistance part (5) comprise fixed resistance elements (41, 51) connected in parallel, MOSFET elements (42, 52), and transistors (43, 53) in diode connection.

    LIGHT-EMISSION ERROR PREVENTING CIRCUIT FOR OPTICAL TRANSMITTER
    7.
    发明公开
    LIGHT-EMISSION ERROR PREVENTING CIRCUIT FOR OPTICAL TRANSMITTER 审中-公开
    电路用于防止错误发光一种用于光发射机

    公开(公告)号：EP2472747A4

    公开(公告)日：2015-05-06

    申请号：EP10811409

    申请日：2010-04-28

    申请人： MITSUBISHI ELECTRIC CORP

    发明人： SENOO KENJI ,  NODA MASAKI ,  YAMANAKA SHIGEO ,  KATAYAMA MASATOSHI

    IPC分类号： H04B10/50 ,  H04B10/60 ,  H04B10/079 ,  H04B10/272 ,  H04B10/40 ,  H04B10/564

    CPC分类号： H04B10/40 ,  H04B10/50

    摘要： A subscriber-side optical network unit (ONU) has a control LSI (10) for outputting a data signal and a pre-bias signal at fixed intervals, an optical transmitter-receiver (30) for producing optical output in response to these signals, and a light-emission error preventing circuit (20) for preventing light-emission error. First and second light-emission error detecting circuits (21) and (22) output an abnormality detection alarm signal when no rising edge occurs in the data signal and pre-bias signal for a prescribed period of time. An OR element (23), when receiving the abnormality detection alarm signal from at least one of the first and second light-emission error detecting circuits (21) and (22), supplies the optical transmitter-receiver (30) with a shutdown signal and halts the optical output.