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    • 1. 发明申请
    • METHOD AND APPARATUS FOR CWDM OPTICAL TRANSMITTER WITH EXTENDED OPERATING TEMPERATURE RANGE
    • 具有延长工作温度范围的CWDM光学发射器的方法和装置
    • WO2006099128A2
    • 2006-09-21
    • PCT/US2006008583
    • 2006-03-10
    • HARMONIC INCBONEN ADINGUYEN HOACHEN LIPINGHUANG WEI
    • BONEN ADINGUYEN HOACHEN LIPINGHUANG WEI
    • H01S5/02453H01S5/02415
    • An optical transmitter for coarse wavelength division multiplexed (CWDM) optical communication systems uses a conventional laser (e.g. laser diode) and in addition a heater element is provided thermally coupled to the laser. A thermal sensor and associated control circuit drive the heater so as to control the power consumed by the heater to assure that the laser's temperature is not lower than a predetermined minimum working temperature. When the sensed laser temperature is above this predetermined minimum temperature, the control circuit turns off the heater. The total operating range of the transmitter in terms of ambient temperature is thus extended beyond its inherent operating range by the maximum laser temperature rise created by the heater. This allows a CWDM optical transmitter with the heater and control circuitry to be used in outdoor applications where a wide ambient temperature range is required.
    • 用于粗波分复用(CWDM)光通信系统的光发射机使用常规激光器(例如激光二极管),此外,加热元件被热耦合到激光器。 热传感器和相关控制电路驱动加热器,以便控制加热器消耗的功率,以确保激光器的温度不低于预定的最低工作温度。 当感测的激光温度高于该预定的最低温度时,控制电路关闭加热器。 因此,通过由加热器产生的最大激光温度上升,传感器在环境温度方面的总工作范围因此延伸到其固有的工作范围之外。 这允许具有加热器和控制电路的CWDM光发射机用于需要宽环境温度范围的户外应用中。
    • 3. 发明申请
    • DEVICE AND PROCESS FOR DATA RATE ACQUISITION
    • 用于数据速率采集的设备和过程
    • WO2008017205A1
    • 2008-02-14
    • PCT/CN2006/001936
    • 2006-08-02
    • TRIDENT MICROSYSTEMS (FAR EAST) LTD, HONG KONG BRANCHSHEN, BoCHEN, Liping
    • SHEN, BoCHEN, Liping
    • H04L7/04
    • H04L7/0054H03L7/091H03L7/0991H03L7/107H03L7/1075H03L7/113H03L7/12H04L7/0004H04L7/0029H04L7/027
    • A baud rate acquisition circuit (10) for synchronizing a sampling signal with an input signal operates in broad rate sweeping and a rate fine tuning phases. In the rate sweeping phase, a timing error detector (24) examines the sampling signal generated by a decimator (16). If the sampling signal is outside a rate acquisition range from the target rate, a rate sweeping algorithm selects a new sampling rate. In response to the sampling rate within the rate acquisition range, the timing error detector (24) examines the asymmetry thereof to generate a rate correction signal to synchronize the sampling signal with the input signal. Next in the rate fine tuning phase, a multiplexer (22) routes the sampling signal through a square root filter (18). By examining the waveform shaped signal, the time error detector (24) synchronizes the sampling signal with the input signal with high accuracy.
    • 用于使采样信号与输入信号同步的波特率采集电路(10)以宽速率扫描和速率微调阶段工作。 在速率扫描阶段中,定时误差检测器(24)检查由抽取器(16)产生的采样信号。 如果采样信号在目标速率以外的速率采集范围之外,则速率扫描算法选择新的采样率。 响应于速率采集范围内的采样率,定时误差检测器(24)检查其不对称性,以产生速率校正信号,以使采样信号与输入信号同步。 接下来在速率微调相位中,多路复用器(22)将采样信号通过平方根滤波器(18)。 通过检查波形信号,时间误差检测器(24)以高精度同步采样信号与输入信号。