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Byte code interpreter for 8051 microcontroller
(2010-12-01)
Jeenjun, N.
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Khuntaweetep, S.
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Somkuarnpanit, S.
This paper proposes a design of byte code interpreter for 8051 microcontroller. We developed a program based on Java language "write once, run everywhere". It can be employed to operate with another system since the program interfaces directly to the interpreter, instead of the real system. There are two instruction sets provided in the program. The first is condition commands such as IF and ELSE. The second is the commands for peripheral interfacing such as I<sup>2</sup>C, RS232 interface, for parallel port, timer and LCD interface. Interpreter is developed with C language, due to its simple structure. It is easy to develop and to modify the code. From the results, condition commands and no condition commands can be execute correctly.
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Implementation of multi-protocol, data acquisition with high speed USB interface, using FPGA
(2010-12-01)
Thanee, S.
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Somkuarnpanit, S.
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Khuntaweetep, S.
This paper describes the implementation of the FPGA as a data acquisition system with high-speed USB interface. This can simplify the data interfacing to the PC by installing most data transfer protocols into one system. The FPGA has the advantage that it allows individual modules on a chip to work independently from each other. Therefore, we can utilize the FPGA as a performance solution for a system which is multi-channeled, with connections to four ADC signals, with the four different protocols of: Parallel, SPI, I2C and One-Wire. In addition, the visual C++ programming for the user interface and data storage application, on a PC, helps this design to respond better to high rates of data acquisition.
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The maximum transmission rate for the silicon-based racetrack microresonator
(2005-12-01)
Somkuarnpanit, S.
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Khuntaweetep, S.
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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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The prediction of the maximum FSR and minimum HPBW for the silicon based ring and racetrack microresonators
(2005-12-01)
Somkuarnpanit, S.
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Koosirivanichakorn, P.
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Khuntaweetep, S.
This paper determines the maximum free spectral range (FSR) and the minimum half power bandwidth (HPBW) of the ring and racetrack resonators based on silicon substrate using FDTD. At the optimum cross-section that provides the compromised efficiency, the relationships between HPB W against the coupling efficiency and FSR, against the racetrack round trip have been obtained. The relationships would be utilized to determine the possibly maximum FSR of 60nm and the minimum HPBW of 5nm, or highest quality factor for the ring microresonator with 1μm radius. © 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.
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Somkuarnpanit, S.
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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.
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Somkuarnpanit, S.
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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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Design of a silicon based race track microcavity resonator using finite-difference time-domain method
(2002-01-01)
Somkuarnpanit, S.
;
Koosirivanichakorn, P.
;
Khuntaweetep, S.
This paper presents an algorithm for use in designing a racetrack microresonator on silicon substrate, whose structure is illustrated in Figure 1. The accurate numerical FDTD has been used to calculate the characteristics of the device in the range of optical communication wavelengths. The optimum size of the guide, as well as the curvature of the curved guide, is considered from the results. From the optimum size of the device, the spectral response is consequently calculated, which leads to two important relationships between half-power bandwidth, HPBW, against the coupling efficiency, K, and free spatial range, FSR, against the racetrack round trip, X<inf>rt</inf> as illustrated in Figure 3 and Figure 4, respectively. Having used these parameters of L and R, in conjunction with the optimum size of the guide, in FDTD simulation, the transfer characteristics can be obtained as following: X<inf>n</inf> = 17.94um, K = 0.223, FSR = 29.45 nm, HPBW= 4.45nm, Q = 346.07 and finesse of 6.62, which are close to the design values. Therefore, our design procedure could be used in design of the dimensions of racetrack microresonators on silicon substrates in the communication wavelengths.
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A wavelength sensor using a structure of curved optical waveguide
(2002-01-01)
Panthasa, R.
;
Khuntaweetep, S.
;
Somkuarnpanit, S.
This paper proposes a wavelength sensor using a section of the curved optical waveguide. The finite-difference time-domain (FDTD) is used in the analysis of the field intensity of the light propagating thorough the structure. The device with a width of 0.6 μm and a thickness of 0.6 μm provides the maximum light transmission. At the particular curve radius of 3 μm, the structure could be employed to measure the communication wavelength, in this case in a range between 1520 and 1580 nm, with the correlation factor of 99.82%. The wide band of wavelengths could possibly be done using a number of wavelength-sensing modules for the required bands. Therefore, it could be employed as a wavelength sensing device for most optical communications, optoelectronics, laser applications.
Some of the metrics are blocked by your
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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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