Characteristics of a Grating-Folded Optical Directional Coupler

Murakami, Y.

doi:10.1080/01468030590966553

Cited by 4 publications

(7 citation statements)

References 10 publications

(13 reference statements)

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“…It has recently been shown [3,7,8] that the numeric solution of an MI constructed with a directional coupler followed by Bragg gratings in the two output arms constitutes an all-optical interferometer applied to telecommunications systems [7,9]. Based on those characteristics, the objective here it to study MIs working as a multiplexer add-drop filter.…”

Section: Theoretical Proceduresmentioning

confidence: 99%

“…The analysis of this device requests the solution of the transfer matrix, and it is complicated by the fact that the coupling and reflections exist simultaneously in a certain region of the device. The analysis of the MI is easier, since the regions of the coupling are separate from the Bragg grating, as shown in Figure 1, [8][9][10]. It is shown that this picture can be applied to the device as a coupler followed by a Bragg grating, and the analysis is considerably simple.…”

Section: Introductionmentioning

confidence: 94%

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Add-Drop Demultiplexer Operating in an Optical Michelson Interferometer Based in Fiber Bragg Gratings for Time Division Multiple Access Systems

Filho

Sousa

Guimarães

et al. 2010

Fiber and Integrated Optics

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This article presents a numerical investigation of the propagation and switching of ultra-short pulses ( 2 ps) using a fiber-optic Michelson interferometer. In this study, the performance of the Michelson interferometer is studied as a function of the non-linear characteristics of the coupler and the fiber Bragg gratings. The numerical studies were done starting from the coupled-mode equations solved using the fourth-order Runge-Kutta method. The switching characteristic of the short pulses was examined as a function of pump power and the dephasing in the reflection amplitude of one of the Bragg gratings in order to obtain an add-drop filter operation. Transmission characteristics, such as cross-talk level, extinction ratio coefficient, and compression factor, were analyzed for different dephasing values and pump powers. Pump powers were examined from below the critical power of the coupler of switching (P D 1 W), at the critical power of switching (P c D 1:73 W), and above (P D 1:95 W). Through this study, one can verify that the transmission, cross-talk level, extinction coefficient, and compression factor depend on the pump power inserted into the device and in the dephasing. The optical fiber Michelson interferometers with identical gratings in the two output arms implement important components as a demultiplexer in add-drop devices. This device has attracted great interest in the field of all-optical switching in telecommunications for operating with high transmission rates.

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Section: Theoretical Proceduresmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 94%

Add-Drop Demultiplexer Operating in an Optical Michelson Interferometer Based in Fiber Bragg Gratings for Time Division Multiple Access Systems

Filho

Sousa

Guimarães

et al. 2010

Fiber and Integrated Optics

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show abstract

“…The Add-Drop Multiplexer (ADM) is one of the key components for dense wavelengthdivision multiplexing (DWDM) systems (Murakami 2005;Kobayashi et al 2007;Baumann et al 1996). In the emerging next-generation transport networks, called intelligent optical networks, WDM-based optical components such as add-drop multiplexers (ADMs) and optical cross-connects (OXCs) will have full knowledge of the wavelengths in the network, status, and traffic-carrying capacity of each wavelength (Ilyas and Mouftah 2003).…”

Section: Optical Add-drop Multiplexersmentioning

confidence: 99%

“…All optical telecommunication networks with high transmission capability, based on optical time division multiplexed (OTDM) and wavelength-division multiplexing (WDM) systems requires stable and compact switching devices for ultrahigh-speed demultiplexing and add/drop multiplexing (Kawanishi 1996;Hess et al 1998;Murakami 2005). Desired features include bit-rate and wavelength flexibility, low fibre-to-fibre losses, and a large dynamic range.…”

Section: Introductionmentioning

confidence: 99%

A performance study of a nonlinear all Fibre Michelson interferometer, add-drop multiplexer, based in Fibre Bragg grating mirrors

et al. 2008

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In this paper we report a numerical investigation of an all-fibre narrowband transmission filter in the arrangement of two identical photo-imprinted Bragg gratings symmetrically located in each arm of a Michelson Interferometer, simulating, thus, an add-drop filter. The transmission characteristics and in addition the crosstalk level and extinction ratio, were studied. The coupled mode theory and the fourth-order Runge-Kutta method were applied, respectively, to solve the coupled differential equations. This is the first study, as far as we now, of the performance of this device considering the nonlinearity of the fibre coupler and linearity of the fibre Bragg gratings. The device is presenting a highly nonlinear behavior dependence in dephasing and pump power.

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“…where Λ is the grating period, n eff is the effective index and N is the order of Bragg [9][10][11][12][13].…”

Section: Fiber Bragg Gratingmentioning

confidence: 99%

Analysis of the Performance of Optical Code-Division Multiple-Access System (OCDMA), Operating with Gold Codes under Nonlinear Effects

Guimarães¹,

Bastos²,

Ferreira³

et al. 2013

JEMAA

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A numerical simulation study of the performance of encoding and decoding of short optical pulse in OCDMA (Optical Code Division Multiple Access) systems under non-linear optical effects is presented. The performance of encoding and decoding short pulses is obtained through use of device FBG (fiber Bragg grating) where the codes are inserted through discrete jumps in the optical phase (±π). The multiuser interference is also the object of the present study, where a figure of merit (interference figure) is used to quantify the interference in multiuser auto and cross correlation. We evaluate the dependence of the multiuser interference for the coupling constant of FBG. Finally, the interference inserted in the autocorrelation due to nonlinear effects generated in the nonlinear switching of the coded pulse in a dual core nonlinear directional coupler is examined, where temporal broadening of pulses decoded is observed.

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Characteristics of a Grating-Folded Optical Directional Coupler

Cited by 4 publications

References 10 publications

Add-Drop Demultiplexer Operating in an Optical Michelson Interferometer Based in Fiber Bragg Gratings for Time Division Multiple Access Systems

Add-Drop Demultiplexer Operating in an Optical Michelson Interferometer Based in Fiber Bragg Gratings for Time Division Multiple Access Systems

A performance study of a nonlinear all Fibre Michelson interferometer, add-drop multiplexer, based in Fibre Bragg grating mirrors

Analysis of the Performance of Optical Code-Division Multiple-Access System (OCDMA), Operating with Gold Codes under Nonlinear Effects

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