Optical waveguides – With optical coupler – Input/output coupler
Reexamination Certificate
2005-09-27
2005-09-27
Ullah, Akm Enayet (Department: 2874)
Optical waveguides
With optical coupler
Input/output coupler
C385S039000
Reexamination Certificate
active
06950578
ABSTRACT:
A long period fiber grating (LPG) device is formed to exhibit a “turn-around-point” (TAP) in a phase matching curve when the group velocities of two propagating modes are matched. When the grating period of the LPG is selected to coincide with the TAP, a large tuning bandwidth is formed. This device has been found to be highly sensitive to changes in the refractive index of the ambient surrounding the LPG (recognizing a change in refractive index as low as 10−4), allowing the device to be used as a sensor for trace elements in the atmosphere. The ability of the TAP LPG to modify the intensity of a propagating optical signal as a function of changes in the refractive dielectric of a surround material also allows for this device to be used as an all-fiber high speed optical signal modulator.
REFERENCES:
patent: 5864641 (1999-01-01), Murphy et al.
patent: 5999671 (1999-12-01), Jin et al.
patent: 6072922 (2000-06-01), Albin et al.
patent: 6097862 (2000-08-01), Abramov et al.
patent: 6128427 (2000-10-01), Espindola et al.
patent: 6154590 (2000-11-01), Jin et al.
patent: 6314222 (2001-11-01), Jang et al.
patent: 6337937 (2002-01-01), Takushima et al.
patent: 6343168 (2002-01-01), Murphy et al.
patent: 6351585 (2002-02-01), Amundson et al.
patent: 6385368 (2002-05-01), Amundson et al.
patent: 6408117 (2002-06-01), Mollenauer
patent: 6463684 (2002-10-01), Jang
patent: 6522810 (2003-02-01), Takushima et al.
patent: 6563984 (2003-05-01), Harumoto et al.
patent: 6647192 (2003-11-01), Yoshida et al.
patent: 6768824 (2004-07-01), Ramachandran
patent: 6768835 (2004-07-01), Ramachandran
patent: 6885792 (2005-04-01), Eggleton et al.
patent: 2003/0002794 (2003-01-01), Ramachandran
patent: 2004/0042714 (2004-03-01), Ramachandran
patent: 2004/0081383 (2004-04-01), Ramachandran
Zhiyong Wang, Siddharth Ramachandran “Ultrasensitive long-period fiber gratings for broadband modulators and sensors” Optics Letters/vol. 28. No. 24/ Dec. 15, 2003.
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