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A wavelength sensor by optical directional coupler
(2005-12-01)
Sae-Tang, K.
;
Somkuarnpanit, S.
A wavelength sensor based on the optical directional coupler is proposed in the paper. The finite-difference time-domain (FDTD) method is used to calculate of the light intensity propagating thorough the structure, and to find the appropriate dimensions of the structure. A particular dimension of the device has shown the coupling efficiency varying linearly with wavelengths. Thus, the structure could be employed as the wavelength sensor for the wavelength in a range between 1.2μm and 1.6μm. © 2005 IEEE.
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The maximum transmission rate for the silicon-based racetrack microresonator
(2005-12-01)
Somkuarnpanit, S.
;
Khuntaweetep, S.
;
Sae-Tang, K.
This paper determines the possibly maximum rate for the optical signal transmitting thorough the racetrack resonator devices. The method of finite-difference time-domain was employed to determine how an optical impulse getting through the device. We observe that the signal requires a certain number of round-trips to couple the signal to the throughput, and causes the delay of the pulse outputting from the device. This indicates that the possible pulse width is in a range of picoseconds, which corresponding to the maximum transmission rate of over a hundred gigabits per second. © 2005 IEEE.
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Determination of bandwidth and free spectral range for the silicon based ring resonators and racetrack microcavity resonators
(2004-12-01)
Khuntaweetep, S.
;
Somkuarnpanit, S.
;
Sae-Tang, K.
This paper determines the free spectral range, FSR, and the half-power bandwidth, HPBW, of the racetrack microresonator, RTM, against the ring microresonator, RM, on silicon substrate. The accurate numerical FDTD has been used to calculate its characteristics in optical communication wavelengths. At the optimum size of the device, the spectral response is calculated, which leads to two relationships between HPBW against the coupling efficiency and FSR against the racetrack round trip. These relationships can be used to determine the possibly maximum FSR and the least HPBW for the RM. Both parameters are degraded for the high coupling RTM. © 2004 IEEE.
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A novel wavelength sensor using a structure of optical directional coupler
(2002-12-01)
Sae-Tang, K.
;
Somkuarnpanit, S.
;
Khuntaweetep, S.
This paper proposes a wavelength sensor based on the optical directional coupler. The finite-difference time-domain (FDTD) is used in analysis of the field intensity of the light propagating thorough the structure. The device with the width of 0.4 μm and the thickness of 0.4 μm, corresponding with the coupling length of 40μm, would provide the linear relationship between the coupling efficiency against the wavelength. The device can be employed to sense the wavelength in a range between 1.5 μm and 1.6 μ, with continuous resolutions. The wide wavelength could be also done by paralleling the light to a number of wavelength-sensing modules with particularly required bands. Therefore, the proposed structure could be employed as the wavelength sensing for most optical communications, optoelectronics and laser applications.
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A wavelength sensor using a structure of curved optical waveguide
(2002-01-01)
Sae-Tang, K.
;
Somkuarnpanit, S.
;
Khuntaweetep, S.
This paper proposes a wavelength sensor using a section of curved optical waveguide. The finite-difference time-domain (FDTD) method is used in analysis of the field intensity of light propagating thorough the structure. Light with different wavelengths would propagate in different energy transmission, which allows to the technique to indicate the light wavelength. Parameters of the structure such as: w, T and R are appropriately considered. The device with a width of 0.6 μm and thickness of 0.6 μm provides the maximum light transmission. At the particular curve radius of 3μm, the structure could be employed to measure the communication wavelengths, in this case in a range between 1520 and 1580 nm, with a correlation factor of 99.82%. The wide band of wavelengths could possibly be carried out using a number of wavelength-sensing modules for particularly required bands.
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A novel wavelength sensor using a structure of optical directional coupler
(2002-01-01)
Sae-Tang, K.
;
Somkuarnpanit, S.
;
Khuntaweetep, S.
The finite-difference time-domain (FDTD) is used in an analysis of the field intensity of light propagating through the structure. The device with width of 0.4 μm and thickness of 0.4 μm, which corresponding to the coupling length of 40 μm, provides a linear relationship between the coupling efficiency against wavelength. The device can sense the wavelength in a range between 1.5 μm and 1.6 μm, with continuous resolution. The wide wavelength could also be achieved by paralleling the light to a number of wavelength-sensing modules with particular required bands. Therefore, it could be employed for wavelength sensing for most optical communications, optoelectronics, laser applications etc.

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