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    • 9. 发明授权
    • Light-controlled light modulator
    • 光控光调制器
    • US06753996B2
    • 2004-06-22
    • US09953796
    • 2001-09-17
    • Yasuo ShibataYasuhiro SuzukiYoshihisa SakaiYasumasa SuzakiAkira OkadaKazuto NoguchiRieko Sato
    • Yasuo ShibataYasuhiro SuzukiYoshihisa SakaiYasumasa SuzakiAkira OkadaKazuto NoguchiRieko Sato
    • G02F101
    • G02F1/3517G02F2/004
    • A light-controlled light modulator can achieve high-speed, low-loss wavelength conversion. Continuous light with a wavelength &lgr;j is launched into an MMI coupler via a port, and is split into two parts by the MMI coupler, which are led to a loop-type interferometer. In the loop-type interferometer, the two parts travel separately around the loop as clockwise traveling light and counterclockwise traveling light, are combined by the MMI coupler again via a filter-equipped phase modulator, thereby being emitted to the port. In this state, signal light &lgr;i(s) with a wavelength &lgr;i is launched into the filter-equipped phase modulator via a port. Even when the wavelength &lgr;i of the signal light &lgr;i(s) is equal to the wavelength &lgr;j of the wavelength converted output light, the wavelength conversion can be achieved with preventing noise from being mixed into the output light emitted from a port.
    • 光控光调制器可以实现高速,低损耗的波长转换。 具有波长lambdaj的连续光通过端口发射到MMI耦合器中,并由MMI耦合器分为两部分,其被引导到环型干涉仪。 在循环式干涉仪中,两个部件围绕环路分别作为顺时针行进光和逆时针方向的行进光,通过MMI耦合器再次通过配有滤波器的相位调制器组合,从而被发射到端口。 在这种状态下,具有波长lambdai的信号灯lambdai通过端口发射到装有滤波器的相位调制器中。 即使当信号光的波长长度等于波长转换的输出光的波长lambdaj时,也可以通过防止噪声混入从端口发出的输出光中来实现波长转换。
    • 10. 发明申请
    • WAVELENGTH SWEPT LIGHT SOURCE
    • 波长光源
    • US20130286454A1
    • 2013-10-31
    • US13978122
    • 2012-01-04
    • Seiji ToyodaKazunori NaganumaYuichi OkabeShogo YagiKazutoshi KatoMasahiro UenoTakashi SakamotoTadayuki ImaiJun MiyazuKazuto NoguchiShigeo Ishibashi
    • Seiji ToyodaKazunori NaganumaYuichi OkabeShogo YagiKazutoshi KatoMasahiro UenoTakashi SakamotoTadayuki ImaiJun MiyazuKazuto NoguchiShigeo Ishibashi
    • G02B26/06
    • G02B26/06H01S3/08027H01S3/105H01S3/107H01S5/141H01S5/142H01S5/143
    • In a wavelength swept light source using a polygon mirror in a well-known art, an oscillation wavelength roughly linearly varies in an upwardly slight convex shape with respect to time. On the other hand, in a wavelength swept light source of SS-OCT, the wavelength is required to vary so that a wavenumber (inverse of wavelength) linearly varies on a time axis. The wavelength swept light source of the well-known art has had a drawback that such wavelength variation cannot be implemented; non-linear distortion occurs in a resultant OCT image; and thereby, a point spread function cannot be kept sharp. According to the present invention, in a wavelength swept light source utilizing an electro-optic deflector including a KTN and so forth, such wavelength variation is caused that the wavenumber linearly varies with respect to a time axis by applying correction, which includes a sawtooth waveform as a main waveform and an exponential component of the sawtooth waveform, to the controlled voltage of the electro-optic deflector. The controlled voltage is controlled so that, as an oscillation wavelength to be swept is swept towards a longer wavelength side, a change rate of the oscillation wavelength is increased. With the controlled voltage, the oscillation wavelength varies more quickly as the oscillation wavelength is swept towards the longer wavelength side, and time variation in the oscillation wavelength is formed in a downwardly convex shape.
    • 在已知技术中使用多面镜的波长扫描光源中,振荡波长相对于时间大致呈线状变化,呈向上略微凸起的形状。 另一方面,在SS-OCT的波长扫描光源中,要求波长变化,使得波数(波长的倒数)在时间轴上线性地变化。 已知技术的波长扫描光源具有不能实现这种波长变化的缺点; 在所得的OCT图像中发生非线性失真; 因此,点扩散功能不能保持尖锐。 根据本发明,在使用包括KTN等的电光偏转器的波长扫描光源中,通过应用校正导致波数相对于时间轴线性变化的波长变化,该修正包括锯齿波形 作为锯齿波形的主波形和指数分量,与电光偏转器的受控电压。 受控电压被控制为使得随着扫描的振荡波长向较长波长侧扫过,振荡波长的变化率增加。 利用受控电压,随着振荡波长向较长波长侧扫描,振荡波长变化更快,振荡波长的时间变化形成为向下凸的形状。