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    • 3. 发明授权
    • Resonant pumped short cavity fiber laser with multiple optical resonators
    • 具有多个光谐振器的谐振泵浦短腔光纤激光器
    • US06295304B1
    • 2001-09-25
    • US09504510
    • 2000-02-15
    • Thomas L. KochStephen G. Grubb
    • Thomas L. KochStephen G. Grubb
    • H01S3067
    • H01S3/0941H01S3/0675H01S3/08086H01S3/13H01S3/1608H01S3/1618H01S3/23H01S3/2383
    • A fiber laser or fiber amplifier uses resonant pumping of the gain medium by providing a pump resonator that establishes a resonator cavity at the pump wavelength which includes the pumped gain medium. The pump resonator may be of a distributed feedback (DFB) or a distributed Bragg reflector (DBR) type construction, and may be combined with signal reflection apparatus of either DFB or DBR type construction that provides oscillation of the desired laser output wavelength. If used without a signal reflection apparatus, the invention may be operated as a resonant pumped fiber amplifier. Multiple resonators may also be pumped by a single pump source by locating each in a different branch of a multiple branch directional coupler. If the resonators are constructed to couple their outputs away from the coupler, a plurality of different laser outputs each having a different wavelength and equal output powers is provided. If the resonators couple their outputs toward the coupler, a plurality of discrete wavelengths each at the same power may be coupled onto a single waveguide. The pumping of the resonators may be from a single source the output of which is coupled into the single waveguide toward the directional coupler using a wavelength selective optical coupler that prevents optical energy outside the wavelength range of the pumping energy from reaching the pumping source.
    • 光纤激光器或光纤放大器通过提供在包括泵浦增益介质的泵浦波长处建立谐振器腔的泵谐振器来使用增益介质的谐振泵浦。 泵谐振器可以是分布式反馈(DFB)或分布式布拉格反射器(DBR)型结构,并且可以与提供所需激光输出波长的振荡的DFB或DBR型结构的信号反射装置组合。 如果在没有信号反射装置的情况下使用,本发明可以作为谐振泵浦光纤放大器来操作。 多个谐振器也可以通过将单个泵浦源定位在多个分支定向耦合器的不同分支中来泵浦。 如果谐振器被构造成将其输出耦合到耦合器,则提供多个具有不同波长和相等输出功率的不同激光输出。 如果谐振器将其输出耦合到耦合器,则以相同功率的多个离散波长可以耦合到单个波导上。 谐振器的泵浦可以来自单个源,其输出使用波长选择性光耦合器耦合到单向波导中,该波长选择光耦合器防止在泵浦能量的波长范围之外的光能量到达泵浦源。
    • 5. 发明授权
    • Article comprising a wavelength-stabilized semiconductor laser
    • 文章包括波长稳定的半导体激光器
    • US5299212A
    • 1994-03-29
    • US28881
    • 1993-03-10
    • Thomas L. KochSheryl L. Woodward
    • Thomas L. KochSheryl L. Woodward
    • H04J14/00H01S5/00H01S5/024H01S5/0625H01S5/068H01S5/0683H01S5/0687H04B10/04H04B10/06H04B10/14H04J14/02H01S3/137H01S3/10H01S3/133
    • H01S5/0687H01S5/02415H01S5/06256H01S5/06837
    • The disclosed article comprises a semiconductor laser (typically a multi-segment DBR laser) and feedback means for controlling the laser wavelength. The wavelength reference element in the feedback means advantageously is an optical fiber comprising an in-line refractive index grating. Such gratings frequently have a transmission spectrum that exhibits subsidiary lobes, in addition to the desired main lobe, potentially compromising the "cold-start" ability of prior art systems. This and other drawbacks of prior art systems exemplarily are overcome by apparatus that comprises a feedback loop that comprises means for causing a current I.sub.B to flow to the "Bragg" section of a multi-segment DBR laser such that wavelength of the laser output is a function of I.sub.B, and that further comprises means for changing the temperature of the laser in response to a change in the wavelength of the laser. Use of a wavelength reference element that has a relatively wide primary minimum facilitates cold starting. Exemplarily, the disclosed article is a wavelength division multiplexed (WDM) optical fiber communication system.
    • 所公开的文章包括半导体激光器(通常是多段DBR激光器)和用于控制激光波长的反馈装置。 反馈装置中的波长参考元件有利地是包括直列折射率光栅的光纤。 除了所需的主瓣之外,这种光栅经常具有展现副叶的透射光谱,潜在地危及现有技术系统的“冷启动”能力。 示例性地,现有技术系统的这个和其它缺点被包括反馈回路的装置克服,该反馈回路包括用于使电流IB流向多段DBR激光器的“布拉格”部分的装置,使得激光输出的波长为 IB的功能,并且还包括用于响应于激光器的波长的变化来改变激光器的温度的装置。 使用具有相对较宽的初级最小值的波长参考元件便于冷启动。 示例性地,所公开的文章是波分复用(WDM)光纤通信系统。
    • 8. 发明授权
    • Resonant pumped short cavity fiber laser
    • 谐振泵浦短腔光纤激光器
    • US6041070A
    • 2000-03-21
    • US970745
    • 1997-11-14
    • Thomas L. KochRobert Waarts
    • Thomas L. KochRobert Waarts
    • H01S3/067H01S3/08H01S3/0941H01S3/13H01S3/16H01S3/23H01S3/07
    • H01S3/0941H01S3/0675H01S3/13H01S3/08086H01S3/1608H01S3/1618H01S3/23H01S3/2383
    • A fiber laser or fiber amplifier uses resonant pumping of the gain medium by providing a pump resonator that establishes a resonator cavity at the pump wavelength which includes the pumped gain medium. The pump resonator may be of a distributed feedback (DFB) or a distributed Bragg reflector (DBR) type construction, and may be combined with signal reflection apparatus of either DFB or DBR type construction that provides oscillation of the desired laser output wavelength. If used without a signal reflection apparatus, the invention may be operated as a resonant pumped fiber amplifier. Resonant pumped lasers may be arranged in series to provide a laser apparatus with a selectable output wavelength. The different laser stages each provide resonance for a different pump wavelength, and each provide resonance for a different signal wavelength. Thus, a particular pump wavelength input to the series arrangement only resonates in one of the laser stages, and therefore only pumps the gain medium of that stage, allowing it to output its unique signal wavelength. The output signals from each laser stage may be coupled out of the series arrangement with wavelength selective optical couplers, each associated with a different laser stage.
    • 光纤激光器或光纤放大器通过提供在包括泵浦增益介质的泵浦波长处建立谐振器腔的泵谐振器来使用增益介质的谐振泵浦。 泵谐振器可以是分布式反馈(DFB)或分布式布拉格反射器(DBR)型结构,并且可以与提供所需激光输出波长的振荡的DFB或DBR型结构的信号反射装置组合。 如果在没有信号反射装置的情况下使用,本发明可以作为谐振泵浦光纤放大器来操作。 谐振泵浦激光器可以串联布置以提供具有可选输出波长的激光设备。 不同的激光平台各自为不同的泵浦波长提供共振,并且各自为不同的信号波长提供谐振。 因此,输入到串联装置的特定泵浦波长仅在一个激光级中共振,因此仅泵浦该级的增益介质,从而允许其输出其唯一的信号波长。 来自每个激光级的输出信号可以与波长选择性光耦合器耦合在串联装置之外,每个与不同的激光级相关联。
    • 9. 发明授权
    • Asymmetric, periodically loaded waveguide for polarization rotation
    • 用于偏振旋转的不对称,周期性加载的波导
    • US5243669A
    • 1993-09-07
    • US864739
    • 1992-04-07
    • Rodney C. AlfernessThomas L. KochYosi Shani
    • Rodney C. AlfernessThomas L. KochYosi Shani
    • G02B6/12G02B6/126G02F1/01G02F1/025G02F1/035
    • G02F1/025G02B6/126G02F1/0353G02B2006/1204G02F2001/0142
    • Polarization rotation is achieved in an exemplary embodiment in an optical waveguide by augmenting the waveguide structure with a plurality of spaced-apart sections for loading the refractive index of the waveguide to cause a lateral asymmetry in the refractive index profile of the waveguide viewed in the plane transverse to the waveguide longitudinal axis. Each spaced-apart section induces non-zero coupling between the principal orthogonal polarization modes. Phase matched coupling between the principal orthogonal polarization modes is achieved by spacing the sections periodically by a distance .LAMBDA. equal to .lambda./.DELTA.N where .lambda. is the propagation wavelength in the waveguide and .DELTA.N is the difference between the effective refractive indices for the principal orthogonal polarization modes. Realizations of the waveguide structure are shown using Group III-V semiconductor rib waveguide structures.
    • 在光波导中的示例性实施例中通过用多个间隔开的部分来增加波导结构来实现极化旋转,以便加载波导的折射率以引起在平面中观察到的波导的折射率分布的横向不对称性 横向波导纵向轴线。 每个间隔开的部分在主正交偏振模式之间引起非零耦合。 主要正交偏振模式之间的相位匹配耦合是通过间隔这些部分周期性地等于λ/ DELTA N的距离LAMBDA来实现的,其中λ是波导中的传播波长,并且DELTA N是主正交的有效折射率之间的差 极化模式。 使用III-V族半导体肋波导结构示出了波导结构的实现。