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    • 6. 发明授权
    • Light source for generating an output signal having spaced apart frequencies
    • 用于产生具有间隔开的频率的输出信号的光源
    • US07315697B2
    • 2008-01-01
    • US10173579
    • 2002-06-18
    • Israel SmilanskiIsaac ShpantzerJacob B. KhurginNadejda ReingandPak Shing ChoYaakov Achiam
    • Israel SmilanskiIsaac ShpantzerJacob B. KhurginNadejda ReingandPak Shing ChoYaakov Achiam
    • H04J14/02H04B10/04
    • H04J14/005H04B10/2543H04B10/2563H04B10/2572H04B10/505H04B10/508H04J14/02
    • A multiple wavelength light source generates an output signal having a comb of accurately spaced apart frequencies with variable free spectral range in the C-band of optical fiber communication. The light source employs an electro-optical modulator (EOM) driven by a signal generator which modulates with EOM with multiple modulation frequencies to widen the output spectrum of signal. The EOM has a crystal provided with a waveguide. The waveguide may be doped with a rare-earth metal to impart gain properties to equalize the intensities of the comb. In one preferred embodiment, Er, Yt or other doping elements provide the gain property to waveguides. The crystal is also provided with periodically poled structure, and this may be engineered so as to form domains of unequal widths to improve the efficiency of modulation. The output signal from the light source may be split and presented to a bank of filters to create a multiple signals, each signal having one of the spaced apart frequencies. The output signals may be used as channels to be modulated by data and then combined in dense wavelength division multiplexing system, or may be used as a soliton source in time-division multiplexed communication systems.
    • 多波长光源在光纤通信的C波段中产生具有可变自由光谱范围的精确间隔开的频率梳的梳状输出信号。 光源采用由信号发生器驱动的电光调制器(EOM),该调制器利用具有多个调制频率的EOM进行调制,以加宽信号的输出频谱。 EOM具有配有波导的晶体。 波导可以掺杂稀土金属以赋予增益特性以均衡梳子的强度。 在一个优选实施例中,Er,Yt或其它掺杂元件为波导提供增益特性。 晶体还具有周期性极化结构,并且这可以被设计成形成不等宽度的域以提高调制效率。 来自光源的输出信号可以被分离并呈现给一组滤波器以产生多个信号,每个信号具有间隔开的频率之一。 输出信号可以用作要由数据调制的信道,然后在密集波分复用系统中组合,或者可以用作时分多路复用通信系统中的孤立源。