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    • 5. 发明授权
    • Raman amplifier
    • 拉曼放大器
    • US06483633B2
    • 2002-11-19
    • US09901451
    • 2001-07-10
    • Masashi OnishiToshiaki Okuno
    • Masashi OnishiToshiaki Okuno
    • H01S330
    • H01S3/302H01S3/06754H01S3/094003
    • A Raman amplifier applicable to a wavelength division multiplexing optical transmission system is proposed. The Raman amplifier, which can make good use of a wavelength range, comprises an optical fiber for Raman amplification and a pump light introducing means. The zero-dispersion wavelength of the optical fiber and the wavelength of the pump light are nearly equal. The wavelength of pump light is preferably in the range where the absolute magnitude of the chromatic dispersion of the optical fiber is less than 0.3 ps.nm−1.km−1. A range near a zero-dispersion wavelength cannot be utilized as a signal range because waveform deterioration of signal light occurs due to four wave mixing. This range can be utilized effectively as a wavelength range of exciting light for Raman amplification.
    • 提出了适用于波分复用光传输系统的拉曼放大器。 可以充分利用波长范围的拉曼放大器包括用于拉曼放大的光纤和泵浦光引入装置。 光纤的零色散波长和泵浦光的波长几乎相等。 泵浦光的波长优选在光纤的色散的绝对幅度小于0.3ps.nm-1.km-1的范围内。 靠近零色散波长的范围不能用作信号范围,因为由于四次波混合而发生信号光的波形恶化。 该范围可以有效地用作拉曼放大的激发光的波长范围。
    • 9. 发明申请
    • Imaging system
    • 成像系统
    • US20090012405A1
    • 2009-01-08
    • US11664979
    • 2006-11-17
    • Takemi HasegawaTakashi IwasakiToshiaki OkunoMasashi Onishi
    • Takemi HasegawaTakashi IwasakiToshiaki OkunoMasashi Onishi
    • A61B6/00
    • A61B5/0086A61B5/0084A61B90/36A61B2090/373
    • An imaging system 1 comprises: an illumination light source unit 10 that emits an illumination light having a wavelength in a near-infrared range; an illumination optical system 20 that illuminates an observed object 90 with the illumination light emitted from the illumination light source unit 10; an imaging optical system 30 that guides as a physical body light the illumination light that has been illuminated by the illumination optical system 20 onto the observed object 90 and has been scattered, reflected, or refracted thereby; and an imaging unit 40 that has an imaging sensitivity in a wavelength band of a near-infrared range, receives the physical body light arrived after being guided by the imaging optical system 30, and images the image of the observed object 90. The imaging unit 40 receives the physical body light after the light has passed through water and hemoglobin.
    • 成像系统1包括:照射光源单元10,其发射具有近红外范围的波长的照明光; 照明光学系统20,其利用从照明光源单元10发射的照明光照亮被观察物体90; 作为物理体引导的成像光学系统30将由照明光学系统20照射的照明光照射到被观察物体90上并被散射,反射或折射; 以及在近红外范围的波长带中具有成像灵敏度的成像单元40接收在被成像光学系统30引导之后到达的物理体光,并对观察对象90的图像进行成像。成像单元 40在光线通过水和血红蛋白后接收身体的光线。