KMITL

Permanent URI for this communityhttps://dspace.kmitl.ac.th/handle/kmitl/1

Browse

Search Results

Now showing 1 - 5 of 5

Some of the metrics are blocked by your
consent settings
Ultrafast all-optical ALU operation using a soliton control within the cascaded InGaAsP/InP microring circuits
(2019-02-04)
Soysouvanh, S.
;
Phongsanam, P.
;
Mitatha, S.
;
Ali, J.
;
Yupapin, P.
A dark-bright soliton conversion is used to perform the two arithmetic logic unit operations namely adder and subtractor operations. The advantage of the system such as power stability, non-dispersion and the dark-bright soliton phase conversion control can be obtained. The input source into the circuit is the bright soliton pulse, with the pulse width of 35 ps, the peak power at 1.55 µm is 1 mW. By using the dark-bright soliton conversion pair, the generated logic bits can be controlled, and the secure bits can be achieved. The simulation results show the output signal with a minimum loss of only 0.1% with respect to a low input power of 1 mW, and ultra-fast response time of about 1 ps can be achieved. It gives the ultra-high bandwidth of more than 40 Gbits−1. The circuit composes six microring resonators made of InGaAsP/InP material with smaller ring radii of 1.5 µm, and the total physical scale of the circuit less than 100 µm2.
Some of the metrics are blocked by your
consent settings
Ultra-fast electro-optic switching control using a soliton pulse within a modified add-drop multiplexer
(2018-09-01)
Soysouvanh, S.
;
Jalil, M. A.
;
Amiri, I. S.
;
Ali, J.
;
Singh, G.
We have proposed the use of a soliton pulse that propagates within a modified add-drop filter, which is made of a GaAsInP/P material. It is in the form of a Panda-ring resonator, from which a bright/dark soliton pulse is input into a system via an input port. The conversion between bright and dark soliton pulses is introduced at the 3 dB coupler, i.e. the change in phase of π/2. But it is not superimposed each other. The output solitons obtained at the through and drop ports are bight and dark solitons respectively. Both signals can be used to form “ON’ and “OFF” or “1” and “0”, which are useful for the digital bit generation. The switching speed of the system can be improved by employing the two nonlinear side rings. In application, secure output bits can be arranged by using the alternative input solitons or the control ports, where the input bright and dark solitons can be converted into output bits. This means that the output bits can be randomly switched between “1” and “0”, which can be identified by the sender. Moreover, the additional information can be multiplexed via the add port and transmitted in either free space or optical fiber via the whispering gallery mode and through port outputs. Finally, the electro-optic switching can be transferred and the electronic switching by the embedded stacked layers, where the ultrafast switching of light input can lead the ultrafast electrical switching speed. The switching speed of ~ 5 fs and the offset time of ~ 220 fs of the “on” and OFF” are achieved by using the selected ring parameters.
Some of the metrics are blocked by your
consent settings
Erratum to: Micropropulsion generation model and simulation by WGM acceleration within a Panda ring resonator system (Microwave and Optical Technology Letters, (2017), 59, 2, (377-380), 10.1002/mop.30309)
(2017-08-01)
Siriroj, R.
;
Techidheera, W.
;
Phatharacom, P.
;
Chiangga, S.
;
Yupapin, P.
Received 9 July 2016 In the above-mentioned article, which appeared in Microwave and Optical Technology Letters, Volume 59#2, DOI 30309, incorrect affiliation information was published for author P. Yupapin. The correction is shown below: 3Department for Management of Science and Technology Development, Ton Duc Thang University, District 7, Ho Chi Minh City, Vietnam 4Faculty of Electrical & Electronics Engineering, Ton Duc Thang University, District 7, Ho Chi Minh City, Vietnam Corresponding author: preecha.yupapin@tdt.edu.vn The publisher regrets any confusion caused by this error.
Some of the metrics are blocked by your
consent settings
Micropropulsion generation model and simulation by WGM acceleration within a Panda ring resonator system
(2017-02-01)
Siriroj, R.
;
Techidheera, W.
;
Phatharacom, P.
;
Chiangga, S.
;
Yupapin, P.
A microbeam accelerator is modeled and simulated using the analogy of whispering gallery mode (WGM) generated by light within a nonlinear microring resonator system, which is called a Panda ring structure and made by an InGaAsP/InP material. The WGM mode is generated after the suitable ring parameters and optical input introducing into the system, especially, the suitable two nonlinear side ring radii are employed. From which, the required multiple propulsion (acceleration) of WGM beams is achieved using the multiple vertical Panda ring layout (several layers). The accelerated WGM beams of the multiple ring circuits can be obtained by the coincident of the multiple Panda rings. The simulation result shows that the proposed ring resonator system can be potentially fabricated within the microscale range and used for a microthruster, in which the required driven force can be used to drive the spacecraft or satellite to the target destination, which is known as a thrust propellant. For example, the result of the propulsion of 2.619–66.81 μN can be obtained by a single device system, which means that the larger volume or area can be used to produce more propulsion output. For further application, the suitable input source such as the infrared light source can also be used to for the micro-heat source, in which the large area of the device array may be useful for large area micro-heat source usage. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 59:377–380, 2017.
Some of the metrics are blocked by your
consent settings
A theoretical model of all-optical switching induced by a soliton pulse in nano-waveguide ring resonator
(2013-01-01)
Nawi, I. N.M.
;
Bahadoran, M.
;
Ali, J.
;
Yupapin, P.
We propose a theoretical model of 1x2 all-optical switching in a silicon nano-waveguide ring resonator induced by a soliton pulse. All-optical switches made by silicon fiber or silicon waveguide have attracted much attention, because the low-absorption wavelength windows of silicon material just match optical fiber communication. However, to achieve all-optical switching in silicon is challenging owing to its relatively weak nonlinear optical properties and require high switching power, which is much higher than the signal power. Such high power is inappropriate for effective on-chip integration. To overcome this limitation, we have used a highly confined nano-waveguide ring resonator structure with soliton pulse input to enhance the nonlinearity and this leads to enhance the effect of refractive index change on the transmission response. The refractive index is changed by controlling the free-carrier concentration through two-photon absorption (TPA) effect. The result indicates that a refractive index change as small as 6.4×10-3 can reduce the switching power to 2.38 ×10-6 W. The nano-waveguide ring resonator all-optical switching described here is achieved by using the concept of strong light confinement, and the switching power is approximately three orders of magnitude lower than the available silicon optical switches. Such controllable switch is desired for achieving high performance in nanometer-size planar structures.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results