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    • 4. 发明授权
    • Tunable fiber optic parametric oscillator
    • 可调光纤参数振荡器
    • US06501591B1
    • 2002-12-31
    • US09431550
    • 1999-10-29
    • Prem KumarDarwin SerklandLijun WangYikai Su
    • Prem KumarDarwin SerklandLijun WangYikai Su
    • G02F135
    • G02F1/395G02F1/3536
    • A tunable fiber optic parametric oscillator includes a nonlinear optical loop mirror or fiber Sagnac interferometer NFSI with a dispersion shifted fiber portion. The oscillator is synchronously pumped to amplify a signal wave, while reflecting the depleted pump pulse back towards the pump. The amplified signal wave and simultaneously generated idler waves are directed to a spectral filter. The spectral filter may be a diffraction grating, a Faraday mirror or other optical filter that is tunable to change the signal wavelength that is reflected back to the NFSI. The fiber optic parametric oscillator is tunable over substantially the entire gain bandwidth and is insensitive to the polarization of the pump pulses. The fiber optic parametric oscillator may be used as a tunable source of short pulses for high speed optical communication systems. The fiber optic parametric oscillator may also be used for synchronization and clock recovery.
    • 可调谐光纤参数振荡器包括具有色散位移光纤部分的非线性光学环路镜或光纤Sagnac干涉仪NFSI。 振荡器被同步泵浦以放大信号波,同时将耗尽的泵浦脉冲反射回泵。 放大的信号波和同时产生的惰轮被引导到频谱滤波器。 光谱滤波器可以是衍射光栅,法拉第镜或其他可调谐的滤光器,以改变被反射回到NFSI的信号波长。 光纤参数振荡器可在整个增益带宽上进行调制,对泵浦脉冲的极化不敏感。 光纤参数振荡器可以用作用于高速光通信系统的短脉冲的可调谐源。 光纤参数振荡器也可用于同步和时钟恢复。
    • 9. 发明授权
    • Control circuit for a tunable laser
    • 可调激光器的控制电路
    • US06950450B2
    • 2005-09-27
    • US10323495
    • 2002-12-18
    • John E. SimsarianYikai Su
    • John E. SimsarianYikai Su
    • H01S5/042H01S5/06H01S5/0625H01S3/10
    • H01S5/042H01S5/0617H01S5/06256
    • A control circuit for a tunable laser has a logic circuit configured to generate a plurality of digital control signals using a table of calibration parameters stored in that circuit. The logic circuit receives an input signal specifying, e.g., an optical communication channel, retrieves the corresponding parameter values from the table of calibration parameters, and generates the digital control signals that are digital-to-analog converted, amplified, and applied to the tunable laser. The table of calibration parameters may be custom-generated for each particular tunable laser to accommodate laser-to-laser variations. In addition, the table of calibration parameters may be periodically updated to correct for wavelength drifting due to laser aging. A control circuit of the invention can be configured to update the table of calibration parameters in a non-disruptive continuous manner while the tunable laser controlled by the circuit is used for data transmission. Certain control circuits of the invention can support channel-to-channel switching times on the order of 50 ns.
    • 用于可调激光器的控制电路具有被配置为使用存储在该电路中的校准参数表来生成多个数字控制信号的逻辑电路。 逻辑电路接收指定例如光通信信道的输入信号,从校准参数表中检索相应的参数值,并生成数模转换,放大并应用于可调谐信号的数字控制信号 激光。 可以为每个特定可调激光器定制校准参数表,以适应激光到激光的变化。 此外,可以周期性地更新校准参数表,以校正由于激光老化引起的波长漂移。 本发明的控制电路可以被配置为以非破坏性的连续方式更新校准参数表,同时由电路控制的可调谐激光器用于数据传输。 本发明的某些控制电路可以支持大约50ns的信道到信道切换时间。