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    • 14. 发明申请
    • EXTERNAL RESONATOR-TYPE WAVELENGTH TUNABLE LASER DEVICE
    • 外部谐振器型波长激光器激光器件
    • US20100246618A1
    • 2010-09-30
    • US12664294
    • 2008-05-22
    • Shinya SudoKenji SatoKoji KudoKenji MizutaniJan De Merlier
    • Shinya SudoKenji SatoKoji KudoKenji MizutaniJan De Merlier
    • H01S3/13
    • H01S5/141H01S5/02248H01S5/028H01S5/0287H01S5/1039
    • The present invention provides an external resonator-type wavelength tunable laser device that can properly fulfill a wavelength tuning function even with the use of a planar wavelength tunable reflector involving a considerable level of residual reflection. The external resonator-type wavelength tunable laser device includes a planar reflection structure enabling a reflection spectral peak wavelength to be varied and a semiconductor element as a semiconductor gain medium. The semiconductor gain medium is composed of a multiple quantum well in which product Γ·L of optical confinement constant Γ and semiconductor gain medium length L (μm) of a gain layer is at least 25 μm and at most 40 μm and in which gain peak wavelength λ0 (nm) observed during carrier injected with a maximum modal gain equal to an internal loss of the semiconductor gain medium is larger than −3·ΔR/2+(λc+35) and smaller than (−(Γ·L)/7+8)·ΔR+(−(Γ·L)+λc+45). Here, ΔR (dB) denotes a reflectance difference, and he (nm) denotes a wavelength at a center of an operating wavelength range of the wavelength tunable laser device.
    • 本发明提供一种外部谐振器型波长可调激光器件,其即使使用涉及相当程度的残余反射的平面波长可调谐反射器也能适当地实现波长调谐功能。 外部谐振器型波长可调激光器件包括能够使反射光谱峰值波长变化的平面反射结构和半导体元件作为半导体增益介质。 半导体增益介质由多重量子阱组成,其中光学限制常数Ggr; 并且增益层的半导体增益介质长度L(μm)为至少25μm且至多40μm,并且其中以最大模态增益注入的载流子注入的增益峰值波长λ0(nm)等于半导体的内部损耗 增益介质大于-3·&Dgr; R / 2 +(λc+ 35)且小于( - (&Ggr;·L)/ 7 + 8)·&Dgr; R +( - (&Ggr;·L)+λc+ 45)。 这里,&Dgr; R(dB)表示反射率差,he(nm)表示波长可调激光器件的工作波长范围的中心处的波长。
    • 15. 发明申请
    • Semiconductor Laser, Module and Optical Transmitter
    • 半导体激光器,模块和光发射机
    • US20090274187A1
    • 2009-11-05
    • US12086287
    • 2007-01-10
    • Koji KudoShinya SudoKenji SatoKenji Mizutani
    • Koji KudoShinya SudoKenji SatoKenji Mizutani
    • H01S5/028H01S5/026H01S5/24
    • H01S5/026
    • A semiconductor optical waveguide-A having an optical amplification function and a semiconductor optical waveguide-B having a light control function are integrated together on the same substrate. A facet of the semiconductor optical waveguide-A facing an isolation trench and a facet of the semiconductor optical waveguide-B facing the isolation trench are configured as a composite optical reflector/optical connector using an optical interference. The facet of the semiconductor optical waveguide-A achieves an optical reflectivity not higher than the reflectivity corresponding to a cleaved facet and not smaller than several percent, and an optical coupling coefficient of not lower than 50% between the semiconductor optical waveguide-A and the semiconductor optical waveguide-B.
    • 具有光放大功能的半导体光波导A和具有光控功能的半导体光波导-B一起集成在同一基板上。 面向隔离沟槽的半导体光波导A的面和面向隔离沟槽的半导体光波导-B的面被配置为使用光学干涉的复合光反射器/光连接器。 半导体光波导A的小面实现不高于对应于切割面的反射率并且不小于几个百分比的光学反射率,并且半导体光波导A与第二半导体光波导A之间的光耦合系数不低于50% 半导体光波导-B。
    • 16. 发明申请
    • Distributed-feedback semiconductor laser, distributed-feedback semiconductor laser array, and optical module
    • 分布反馈半导体激光器,分布反馈半导体激光器阵列和光学模块
    • US20070104242A1
    • 2007-05-10
    • US10580560
    • 2004-11-12
    • Koji KudoKenji MizutaniKenji SatoTomoaki Kato
    • Koji KudoKenji MizutaniKenji SatoTomoaki Kato
    • H01S3/08
    • B82Y20/00H01S5/0264H01S5/028H01S5/1014H01S5/1039H01S5/124H01S5/2224H01S5/227H01S5/34306H01S5/4031H01S5/4087
    • A distributed-feedback semiconductor laser as a direct modulation light source with a modulation rate over 10 Gb/s having (1) a low threshold current characteristic, (2) a high single-mode characteristic, (3) a high resonant frequency (fr) characteristic, (4) a high temperature characteristic, and (5) adaptability to wide wavelength band and an extremely short active region. The distributed-feedback semiconductor laser 1 comprises an active region 30 for generating the gain of the laser beam and a diffraction grating 13 formed in the active region 30. Out of the two front and back end surfaces sandwiching the active region 30, the front end surface 1a has a reflectivity of 1 percent or less, and the back end surface 1b has a reflectivity of 30 percent or more when viewed from the back end surface 1b toward the front. The coupling coefficient κ of the diffraction grating 13 is 100 cm−1 or more, and the length L of the active region 30 is 150 μm or less. A combination of κ and L provided that Δα/gth is 1 or more is used where Δα is the gain difference between modes and gth=(internal loss αi+mirror loss αm) is the threshold gain.
    • 作为具有(1)低阈值电流特性的调制速率超过10Gb / s的直接调制光源的分布反馈半导体激光器,(2)高单模特性,(3)高谐振频率(fr )特性,(4)高温特性,(5)适用于宽波段和极短的有源区。 分布反馈半导体激光器1包括用于产生激光束的增益的有源区域30和形成在有源区域30中的衍射光栅13.在夹持有源区域30的两个前端和后端表面之外,前端 表面1a的反射率为1%以下,后端面1b从后端面1b向前方观察时的反射率为30%以上。 衍射光栅13的耦合系数kapp为100cm -1以上,有源区30的长度L为150μm以下。 使用kappa和L的组合,其中使用Deltaalpha / g第1个或更多个,其中Deltaalpha是模式之间的增益差异,并且第g个内部损失α i +镜像损失alpha )是阈值增益。
    • 17. 发明授权
    • Purification of 2,3-dichloro-1-propanol
    • 2,3-二氯-1-丙醇的纯化
    • US5227541A
    • 1993-07-13
    • US982119
    • 1992-11-25
    • Toshio MoriHiromitu NojimaKoji KudoTatsuharu Arai
    • Toshio MoriHiromitu NojimaKoji KudoTatsuharu Arai
    • C07C29/80C07C31/36
    • C07C31/36C07C29/80
    • A process for purifying 2,3-dichloro-1-propanol is disclosed, which comprises introducing a chlorination reaction mixture obtained by chlorination of allyl alcohol in a hydrochloric acid aqueous solution in a reactor, to a degassing tower, where hydrogen chloride is released, returning the hydrogen chloride to the chlorination reactor, cooling the residual liquid to separate into an aqueous layer and an oily layer, and returning the aqueous layer to the chlorination reactor while recovering 2,3-dichloro-1-propanol from the oily layer, wherein said oily layer is introduced to a first distillation tower, where hydrogen chloride, part of the produced 2,3-dichloro-1-propanol, and other low-boiling components are recovered as a distillate, cooling the distillate to separate it into an aqueous layer and an oily layer, returning the aqueous layer of the distillate to the chlorination reactor, and recovering 2,3-dichloro-1-propanol from the oily layer of the distillate and a high-boiling fraction of the first distillation tower. Where 2,3-dichloro-1-propanol is for use as a starting material of epichlorohydrin, the process involves no wasteful consumption of calcium hydroxide.
    • 公开了一种纯化2,3-二氯-1-丙醇的方法,其包括将通过将烯丙醇在反应器中的盐酸水溶液中氯化得到的氯化反应混合物引入到其中释放氯化氢的脱气塔, 将氯化氢返回到氯化反应器中,冷却残留液体以分离成水层和油层,并将水层返回氯化反应器,同时从油层中回收2,3-二氯-1-丙醇,其中 将所述油层引入第一蒸馏塔,其中将氯化氢,部分产生的2,3-二氯-1-丙醇和其它低沸点组分作为馏出物回收,冷却馏出物以将其分离成水 层和油层,将馏出物的水层返回到氯化反应器中,并从馏出物的油层和高沸点馏分中回收2,3-二氯-1-丙醇 第一蒸馏塔的离子。 当2,3-二氯-1-丙醇用作表氯醇的起始原料时,该方法不会浪费氢氧化钙的消耗。