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    • 1. 发明授权
    • Tunable laser source with an integrated wavelength monitor and method of operating same
    • 具有集成波长监视器的可调谐激光源及其操作方法
    • US06714566B1
    • 2004-03-30
    • US09914728
    • 2002-01-03
    • Larry A. ColdrenThomas Gordon Beck MasonGregory Fish
    • Larry A. ColdrenThomas Gordon Beck MasonGregory Fish
    • H01S310
    • H01S5/0687H01S5/026H01S5/0264H01S5/06256
    • A wavelength monitor is provided based on the transmission response of an optical filter. The monitor provides feedback to the laser enabling it to lock to any given wavelength within its tuning range. The invention is also a process for integrating the wavelength monitor directly on chip with a variety of tunable semiconductor lasers. The invention also comprises a method for controlling the wavelength of a tunable laser by using a wavelength monitor to measure the output light and provide feedback to a control system. The laser and wavelength monitor are integrated together on a single indium phosphide chip. The wavelength monitor comprises a filter with a wavelength dependent transmission function and a pair of detectors. One detector is illuminated with light that has passed through the filter and the other provides a reference to measure the input intensity. Taking the ratio of the filtered light level to the unfiltered light provides a wavelength dependent wavelength. The filter is designed such that the transmission function is monotonic and varies from a minimum at one extent of the laser's tuning range to a maximum at the other extent.
    • 基于滤光器的透射响应提供波长监视器。 监视器为激光器提供反馈功能,使其能够锁定到其调谐范围内的任何给定波长。 本发明也是将波长监视器直接集成在各种可调谐半导体激光器上的过程。 本发明还包括一种通过使用波长监视器来测量可调激光器的波长以测量输出光并向控制系统提供反馈的方法。 激光和波长监测器集成在一个磷化铟芯片上。 波长监视器包括具有波长依赖传输功能的滤波器和一对检测器。 一个检测器用已经通过过滤器的光照亮,另一个检测器用于测量输入强度。 将滤光光级与未过滤光的比率提供波长相关的波长。 滤波器被设计成使得透射功能是单调的,并且在激光器的调谐范围的一个程度上的最小值在另一个程度上变化到最大值。
    • 4. 发明授权
    • Integrated wavelength tunable single and two-stage all-optical wavelength converter
    • 集成波长可调单,双级全光波长转换器
    • US07310363B1
    • 2007-12-18
    • US10469789
    • 2000-09-28
    • Thomas Gordon Beck MasonGregory FishDaniel J Blumenthal
    • Thomas Gordon Beck MasonGregory FishDaniel J Blumenthal
    • H01S5/00H04B10/04
    • H01S5/026H01S5/02248H01S5/06256H01S5/2063H01S5/227H01S5/4006H01S5/4031H01S5/50H01S5/509
    • A semiconductor tunable laser (10) and an interferometer (12) coupled to the tunable laser (10) are monolithically fabricated in a semiconductor heterostructure. The laser also comprises a buried ridge stripe waveguide laser. The interferometer (12) has a semiconductor optical amplifier (38) coupled in each arm. A cross-gain semiconductor optical amplifier converter is coupled to the interferometer (12). The semiconductor optical amplifier (38) coupled in each arm is biased so that an optical path length difference between the two arms is in antiphase which results in destructive interference. The output of the tunable laser (10) is coupled to a coupler. A semiconductor optical amplifier (38) is used as a gain controller for the semiconductor optical amplifiers in the interferometer (12) to allow wavelength conversion over a larger range of input signal powers. The heterostructure substrate comprises a low bandgap waveguide layer and thinner multi-quantum well active regions disposed above the low bandgap waveguide layer. The heterostructure substrate has nonabsorbing passive elements formed therein by selectively removing the quantum wells regions above the waveguide layer to allow formation of active and passive sections in the waveguide layer without having to perform a butt joint regrowth. The invention is also characterized as a method of fabricating an integrated optical device as disclosed above in the heterostructure substrate.
    • 耦合到可调谐激光器(10)的半导体可调谐激光器(10)和干涉仪(12)在半导体异质结构中单片地制造。 激光器还包括埋脊状条纹波导激光器。 干涉仪(12)具有耦合在每个臂中的半导体光放大器(38)。 交叉增益半导体光放大器转换器耦合到干涉仪(12)。 耦合在每个臂中的半导体光放大器(38)被偏置,使得两个臂之间的光程长度差是反相的,这导致相消干涉。 可调谐激光器(10)的输出耦合到耦合器。 半导体光放大器(38)用作干涉仪(12)中的半导体光放大器的增益控制器,以允许在更大范围的输入信号功率上进行波长转换。 异质结构衬底包括低带隙波导层和设置在低带隙波导层上方的较薄的多量子阱有源区。 异质结构衬底通过选择性地去除波导层上方的量子阱区域而形成在其中形成的非吸收性无源元件,以允许在波导层中形成有源和无源部分而不必执行对接再生长。 本发明的特征还在于如上所述在异质结构衬底中制造集成光学器件的方法。