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    Adjustment of a laser diode output power compensator
    1.
    发明公开
    Adjustment of a laser diode output power compensator 有权
    Regelung einen Diodenlaserleistungskompensator

    公开(公告)号：EP0963016A3

    公开(公告)日：2003-08-13

    申请号：EP98119243.8

    申请日：1998-10-12

    申请人： Hewlett-Packard Company, A Delaware Corporation

    发明人： Luque, Phillip R.

    IPC分类号： H01S3/133

    CPC分类号： H01S5/0683 ,  B41J2/471 ,  H01S5/0617

    摘要： A first embodiment of an adjustment circuit (30) for a laser diode output power compensator includes a feedback circuit for adjusting the laser diode output power compensator so that the output power of the laser diode is substantially constant. The feedback circuit includes a photodiode (35) for measuring the output power of a VCSEL diode (20). The signal from the photodiode (35) is coupled to a first amplifier (39). The difference between the signal from the photodiode (35) and a first reference value is amplified and coupled through electronic switches (40, 42, 44) to selectively charge one of multiple capacitors (41, 43, 45). The multiple capacitors (41, 43, 45) are each coupled to one of a drive current source (32), a compensation current source (31), and a voltage controlled resistor (34), each of which are voltage controlled. A second amplifier (38) is used for amplifying the difference between the signal from the photodiode (35) and a second reference value to charge a capacitor (47) coupled to a voltage controlled bias current source (33). The first embodiment of the adjustment circuit (30) controls the bias current source (33), drive current source (32), compensation current source (31), and the voltage controlled resistor (34) so that the output power of the VCSEL diode is held substantially constant. A second embodiment of the adjustment circuit (30) uses an analog to digital converter (203), a digital comparator (204), a counter (205), and registers (206, 207, 208, 209) to form the feedback circuit for adjusting the laser diode output power compensator. A third embodiment of the adjustment circuit (30) uses an analog comparator (404), counters (410, 411, 412, 413), and registers (414, 415, 416, 417) to form the feedback circuit for adjusting the laser diode output power compensator.

    摘要翻译： 用于激光二极管输出功率补偿器的调整电路（30）的第一实施例包括用于调整激光二极管输出功率补偿器的反馈电路，使得激光二极管的输出功率基本上恒定。 反馈电路包括用于测量VCSEL二极管（20）的输出功率的光电二极管（35）。 来自光电二极管（35）的信号耦合到第一放大器（39）。 来自光电二极管（35）的信号和第一参考值之间的差异被放大并通过电子开关（40,42,44）耦合，以选择性地对多个电容器（41,43,45）之一充电。 多个电容器（41,43,45）各自耦合到驱动电流源（32），补偿电流源（31）和压控电阻器（34）中的每一个，其中每一个被电压控制。 第二放大器（38）用于放大来自光电二极管（35）的信号与第二参考值之间的差异，以对耦合到电压控制偏置电流源（33）的电容器（47）充电。 调节电路（30）的第一实施例控制偏置电流源（33），驱动电流源（32），补偿电流源（31）和压控电阻器（34），使得VCSEL二极管 保持基本恒定。 调节电路（30）的第二实施例使用模数转换器（203），数字比较器（204），计数器（205）和寄存器（206,207,208,209）以形成反馈电路 调整激光二极管输出功率补偿器。 调整电路（30）的第三实施例使用模拟比较器（404），计数器（410,411,412,413）和寄存器（414,415,416,417）来形成用于调整激光二极管的反馈电路 输出功率补偿器。

    Wavelength controlling circuit for laser signal
    2.
    发明公开
    Wavelength controlling circuit for laser signal 有权
    对于激光波长的信号控制电路

    公开(公告)号：EP0939470A3

    公开(公告)日：2001-04-25

    申请号：EP99301478.6

    申请日：1999-02-26

    申请人： NEC CORPORATION

    发明人： Yasuda, Norihiro

    IPC分类号： H01S3/133

    CPC分类号： H01S5/0687 ,  H01S5/06804 ,  H01S5/06837

    摘要： A wavelength controlling circuit for a laser signal is able to set a laser signal to a target wavelength readily upon the wavelength control of the laser signal and minimises the problem of drift. In Fig. 3, a wavelength controlling circuit for a laser signal is shown which includes a laser diode module (3) having a semiconductor laser diode (31), a temperature detection element (32) and a temperature adjustment element (33). Wavelength controlling means has an optical band-pass filter (42) which is used as a wavelength discrimination element for controlling the wavelength of a laser signal within a range of fine adjustment within which the wavelength can be discriminated by the optical band-pass filter (42), and temperature controlling means is provided for adjusting, when the wavelength of the laser signal is outside the range within which the wavelength can be discriminated with a wavelength discrimination characteristic by the optical band-pass filter (42), the wavelength of the laser signal roughly so that the wavelength may be included in the discrimination allowing range.

    AN OPTICAL TRANSMITTER
    3.
    发明公开
    AN OPTICAL TRANSMITTER 无效
    光发送器

    公开(公告)号：EP1042875A1

    公开(公告)日：2000-10-11

    申请号：EP98962299.8

    申请日：1998-12-22

    申请人： TELLABS DENMARK A/S

    发明人： JENSEN, Niels, Anker

    IPC分类号： H04B10/155 ,  H01S3/133

    CPC分类号： H04B10/564 ,  H01S5/0683 ,  H01S5/06832 ,  H04B10/504

    摘要： An optical transmitter comprises a laser diode (1) capable of emitting an optical signal in response to an electric current through the laser diode, said current consisting of a bias contribution and a modulation contribution provided by an information signal. The transmitter moreover comprises a photodetector (2) capable of detecting the optical signal and emitting an electrical monitor signal in response to the optical signal. The monitor signal is used for controlling the laser diode by means of first and second control loops. The first control loop controls the size of the bias contribution of the current through the laser diode in response to the monitor signal. The second control loop is adapted to control the size of the modulation contribution of the current through the laser diode in response to the monitor signal; the second control loop comprises a transimpedance amplifier (14) having a low input impedance, said monitor signal being connected to an input on this transimpedance amplifier. The first control loop comprises a current-controlled source (7), and the electrical monitor signal is connected to an input on this current-controlled source.

    Optical device for wavelength monitoring and wavelength control
    4.
    发明公开
    Optical device for wavelength monitoring and wavelength control 失效
    对于波长的监测和控制的光学器件

    公开(公告)号：EP0911621A3

    公开(公告)日：2000-05-17

    申请号：EP98301916.7

    申请日：1998-03-13

    申请人： FUJITSU LIMITED

    发明人： Fukushima, Nobuhiro, c/o Fujitsu Limited

    IPC分类号： G01J9/00 ,  H01S3/133

    CPC分类号： G01J9/00

    摘要： An optical device (4) has an optical element (54) having a first surface (54A) and a second surface (54B) not parallel to each other. The optical element separates a light beam (CB) supplied to the first surface (54A) into a first beam (CB1) reflected on the first surface (54A), a second beam (CB2) passed through the first surface (54A), reflected on the second surface (54B), and passed through the first surface (54) again, and a third beam (CB3) passed through the first surface (54A) and the second surface (54B) in this order. An optical filter (56) is provided to transmit the first and second beams (CB1,CB2). The optical filter (56) has wavelength characteristics different according to an incidence angle. The first and second beams (CB1,CB2) passed through the optical filter (56) are supplied to first and second photodetectors (60,62), respectively. On the basis of the difference in wavelength characteristic, the wavelength of the light beam (CB) can be monitored according to outputs from the first and second photodetectors (60,62).

    Current control for an analog optical link
    7.
    发明公开
    Current control for an analog optical link 失效
    模拟光链路的电流控制

    公开(公告)号：EP0878882A3

    公开(公告)日：1998-12-09

    申请号：EP98108522.8

    申请日：1998-05-11

    申请人： AT&T Corp.

    发明人： Gnauck, Alan H. ,  Woodward, Sherly Leigh

    IPC分类号： H01S3/133 ,  H04B10/00

    CPC分类号： H04B10/504 ,  H01S5/0683 ,  H04B10/564

    摘要： A control circuit for an injection laser provides a pre-bias current which prevents clipping induced errors in the laser output. An analog modulating signal is provided directly to the laser which receives the sum of a feedback current (Ifb) and a current source (Io) as the pre-bias current (Ipb). A monitor diode detects the laser light output and provides a current (Idet). A feedback circuit operates in a limited dynamic range, e.g. I 1 +/- 40 mA or is incapable of outputting a negative current (Ifb>0). The feedback circuit responds to changes in Idet and adjusts the laser pre-bias current to hold Idet equal to a preset value, which effectively holds the laser's average output power constant. If the pre-bias current necessary to hold Idet fixed falls below some minimum level, Imin, the feedback circuit will run out of dynamic range and the laser's average power will increase. By preventing Ipb from falling below Imin clipping induced errors and distortion are avoided.

    摘要翻译： 用于注入激光器的控制电路提供预偏置电流，其防止激光输出中的削波引起的误差。 模拟调制信号被直接提供给接收反馈电流（Ifb）和电流源（Io）之和作为预偏置电流（Ipb）的激光器。 监视器二极管检测激光输出并提供电流（Idet）。 反馈电路在有限的动态范围内工作，例如， I1 +/- 40 mA或不能输出负电流（Ifb> 0）。 反馈电路响应Idet中的变化并调整激光器预偏置电流以保持Idet等于预设值，这有效地保持激光器的平均输出功率恒定。 如果保持Idet固定所需的预偏置电流降至某个最小电平（Imin）以下，则反馈电路将耗尽动态范围，并且激光器的平均功率将增加。 通过防止Ipb下降到Imin限幅以下，避免了引起的误差和失真。