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    • 13. 发明授权
    • Optical information reproducing device, optical information recording device, and method for recording optical information
    • 光信息再现装置,光信息记录装置和用于记录光信息的方法
    • US08730775B2
    • 2014-05-20
    • US12985410
    • 2011-01-06
    • Hideharu Mikami
    • Hideharu Mikami
    • G11B7/00G11B7/135
    • G11B7/0065G11B7/00781G11B7/1369G11B7/24044G11B7/2467G11B7/25
    • Multi-level recording is quite effective for attaining a larger capacity and a higher transfer rate in the case of an optical disk; however, with conventional technologies, a SIGNAL-TO-NOISE RATIO of a signal deteriorates along with an increase in a multi-level degree, creating a factor for limitations to the multi-level degree. In order to solve problems, when optical information is recorded by use of a standing wave occurring due to interference between two light beams, at least one of the two light beams is modulated in multi-stages. Further, at the time of regeneration, a regeneration reference beam is caused to interfere with respective polarization components of a regeneration beam, the polarization components being orthogonal to each other, thereby concurrently generating not less than three interference beams differing in interference phase from each other before being detected.
    • 多级记录对于在光盘的情况下获得更大的容量和更高的传输速率是非常有效的; 然而,利用传统技术,信号的信号噪声比随着多级度的增加而恶化,从而产生了对多级程度的限制的因素。 为了解决问题,当通过使用由于两个光束之间的干涉而发生的驻波来记录光学信息时,两个光束中的至少一个被多级调制。 此外,在再生时,使再生参考光束与再生光束的各偏振分量相互干扰,偏振分量彼此正交,从而同时产生不少于干涉相位彼此不同的三个干涉光束 在被检测之前。
    • 17. 发明授权
    • Demodulator and optical transceiver
    • 解调器和光收发器
    • US08855502B2
    • 2014-10-07
    • US13176772
    • 2011-07-06
    • Hideharu Mikami
    • Hideharu Mikami
    • H04B10/61H04L27/22
    • H04L27/223H04B10/613H04B10/614
    • In a free space optical system type demodulator of a phase shift keying signal, if a half beam splitter is used as a non-polarizing optical branching unit that is used when generating beams corresponding to I and Q channels or when multiplexing an interference light, control of a power branching ratio is difficult, and it is necessary to suppress phase shifts that are different depending on a polarization state of an input state, and thereby the demodulator becomes high cost. Moreover, since directions of branched lights are different, it is difficult to suppress a skew of the demodulator. In the present invention, the non-polarizing optical branching unit that is used when generating the beams corresponding to the I and Q channels and when multiplexing the interference light is realized using polarization rotating elements and polarization separating elements. Moreover, branched beams are substantially aligned.
    • 在相移键控信号的自由空间光系统型解调器中,如果使用半分束器作为在产生与I和Q通道相对应的波束时使用的非偏振光分路单元,或者当复用干扰光时,控制 功率分支比是困难的,并且需要抑制根据输入状态的偏振状态而不同的相移,从而解调器变得高成本。 此外,由于分支灯的方向不同,难以抑制解调器的偏斜。 在本发明中,使用偏振光旋转元件和偏振分离元件来实现在产生与I和Q通道对应的光束时以及多路复用干涉光时使用的非偏振光分支单元。 此外,分支光束基本对齐。