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    • 27. 发明申请
    • METHOD AND APPARATUS FOR AN OPTICAL FILTER
    • 光学滤波器的方法和装置
    • WO2002071103A2
    • 2002-09-12
    • PCT/US2002/003717
    • 2002-02-08
    • NEW FOCUS, INC.
    • XIE, PingWU, Simon, YuanxiangMAO, YalanWANG, WeiBETTMAN, Brad, R.MALUF, Nadim
    • G02B
    • G02B6/272G02B6/12007G02B6/2773G02B6/2861G02B6/29302G02B6/2935G02B6/29355G02B6/29386G02B6/29394G02B2006/12109G02B2006/12116G02B2006/12164
    • An optical device that can be used in a range of telecommunications applications including optical multiplexers/demultiplexers, optical routers and optical gain scalers. The optical device splits and combines optical signals of frequency division multiplexed optical communication channels which are evenly spaced apart in frequency from one another. In a embodiment of the invention the optical device includes a first and a second filter. The first filter splits and combines odd and even channels depending on the propagation direction of the optical signal. The first filter exhibits complementary phase retardations corresponding with odd integer multiples of half a wavelength for each center wavelength associated with a selected one of the odd and even set of channels and with integer multiples of a full wavelength for each center wavelength associated with a remaining one of the odd set and the even set. The second filter couples with the first filter to filter the odd and even sets of channels with phase retardations complementary to those experienced by the odd and even set of channels in the first filter. This complementary filtration has the effect of reducing dispersion in the device. In an alternate embodiment of the invention a modular optical filter is disclosed with two or more couplers with a pair of delay paths between each pair of couplers in a sequence to generate a range of optical filter functions. The desired filter profile/function is obtained by proper selection of the coupling ratio for each coupler and by the length of each pair of delay paths. The couplers may be implemented aspolarization or intensity beam splitters. In an embodiment of the invention the filter may be passively thermally stabilized.
    • 可用于包括光复用器/解复用器,光路由器和光增益定标器在内的一系列电信应用中的光学装置。 光学装置分离并组合频率彼此均匀间隔开的频分复用光通信信道的光信号。 在本发明的实施例中,光学装置包括第一和第二滤光器。 第一滤波器根据光信号的传播方向分离并组合奇数和偶数信道。 第一滤波器表现出互补相位延迟,其对应于与奇数和偶数通道组中选定的一个相关联的每个中心波长的半波长的奇整数倍,并且对于与剩余的一个相关联的每个中心波长的整个倍数 的奇数集和偶数集。 第二滤波器与第一滤波器耦合以对具有与第一滤波器中的奇数和偶数个通道组经历的相位延迟互补的奇数和偶数组信道进行滤波。 这种补充过滤具有减少装置中的分散的作用。 在本发明的替代实施例中,公开了具有两个或更多个耦合器的模块化滤波器,该耦合器在每对耦合器之间具有一对延迟路径,以产生一系列滤光器功能。 期望的滤波器轮廓/功能通过适当地选择每个耦合器的耦合比和每对延迟路径的长度来获得。 耦合器可以被实现为非极化或强度分束器。 在本发明的一个实施例中,过滤器可以是被动热稳定的。
    • 29. 发明申请
    • NARROW BAND LASER WITH WAVELENGTH STABILITY
    • 具有波长稳定性的窄带激光器
    • WO2007037936A1
    • 2007-04-05
    • PCT/US2006/034868
    • 2006-09-07
    • NEW FOCUS, INC.WANG, WeizhiZHANG, Guangzhi, A.LE, Lam, Thanh
    • WANG, WeizhiZHANG, Guangzhi, A.LE, Lam, Thanh
    • H01S5/14
    • H01S5/141H01S3/08059H01S3/1062H01S5/02208H01S5/02248H01S5/02415H01S5/02438H01S5/06837
    • An external cavity diode laser system (40) includes a thin film filter (52) . The output facet (44) of the laser diode (42) is coated with a partial reflection coating and the cavity side facet (48) is coated with an anti-reflection coating. A roof-top prism or corner cube retroref lector (56) serves as the laser cavity end reflector and provides stability of the wavelength of the output over time. The laser cavity lies between the partial reflective coated facet (44) of the laser diode (42) and retroreflector (56) . A collimating lens (50) and a thin film filter (52) are located between the end reflector (56) and the laser diode cavity side facet (48) . The lasing wavelength can be adjusted during either manufacture or operation by tilting the filter (52) . Also included is thermal compensation in the mounting for the retroreflector (56) to compensate for thermal movement of the laser system cavity.
    • 外腔二极管激光器系统(40)包括薄膜过滤器(52)。 激光二极管(42)的输出面(44)涂覆有部分反射涂层,并且空腔侧面(48)涂覆有抗反射涂层。 屋顶棱镜或角立方反光镜(56)用作激光腔端反射器,并提供输出波长随时间的稳定性。 激光腔位于激光二极管(42)的偏反射涂层面(44)和后向反射器(56)之间。 准直透镜(50)和薄膜过滤器(52)位于端部反射器(56)和激光二极管腔侧面(48)之间。 可以通过倾斜过滤器(52)在制造或操作过程中调整激光波长。 还包括用于后向反射器(56)的安装中的热补偿以补偿激光系统腔的热运动。
    • 30. 发明申请
    • LASER COHERENCE CONTROL USING HOMOGENEOUS LINEWIDTH BROADENING
    • 激光相干控制使用均匀线性广播
    • WO2005022710A1
    • 2005-03-10
    • PCT/US2004/028141
    • 2004-08-27
    • NEW FOCUS, INC.
    • WILLIAMSON, Robert, S., III
    • H01S3/10
    • G02F1/0121H01S3/0057
    • An apparatus and method for linewidth broadening applied to a laser that emits a light having an output frequency ν and an emission linewidth δ E . The apparatus is equipped with an electro-optic modulator for intercepting the light and a noise generator for driving the electro-optic modulator with a radiofrequency (RF) noise signal spanning a frequency range selected to broaden the emission linewidth δ E of the light passing through the electro-optic modulator to a broadened linewidth δ B . The noise spectrum of the noise signal exhibits a continuous frequency range and can be flat or sloping. The range extends from low frequency ω L set below the emission linewidth δ E of the light to a high frequency ω H set above the emission linewidth δ E of the light. The electro-optic modulator can be selected from among many suitable devices including optical crystals. Further broadening can be achieved by employing one or more secondary EOMs operating in resonant or non-resonant modes. The lasers that benefit from the invention involve any type of inherently narrow bandwidth lasers operating in CW or pulsed modes.
    • 应用于发射具有输出频率nu和发射线宽ΔE的光的激光器的线宽变宽的装置和方法。 该装置配备有用于遮断光的电光调制器和用于驱动电光调制器的噪声发生器,其具有跨越所选择的频率范围的射频(RF)噪声信号,以扩大通过该光纤的光的发射线宽δE 电光调制器变宽到线宽ΔB。 噪声信号的噪声频谱呈现连续的频率范围,可以是平坦的或倾斜的。 该范围从低于光的发射线宽δE的低频ωLL延伸到高于光的发射线宽δE的高频ω-H组。 电光调制器可以从包括光学晶体的许多合适的装置中选择。 通过使用以共振或非共振模式工作的一个或多个次级EOM可以进一步加宽。 受益于本发明的激光器涉及以CW或脉冲模式操作的任何类型的固有窄带宽激光器。