Effect of chirped gratings on reflective optical bistability in DFB semiconductor laser amplifiers

Maywar, Drew N.; Agrawal, Govind P.

doi:10.1109/3.736108

Cited by 35 publications

(23 citation statements)

References 21 publications

(27 reference statements)

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“…Photon lifetime has been dramatically reduced by the low-Q cavities, and hence the average intensity in the optical amplifiers, which causes the stimulated emission, is lowered. This conclusion can also be obtained from the expression of the ratio of average intensity in the amplifiers to input intensity, which is given [11] …”

Section: Theorymentioning

confidence: 93%

“…Thus, there is a change in the detuning, and, as this passes through the cavity resonance, it gives rise to optical bistability. In other words, OB occurs when changes in input optical signal power shift the cavity resonance through the signal wavelength, thereby reinforcing the power change and creating a positive feedback loop [11]. The process is damped by gain saturation.…”

Section: Theorymentioning

confidence: 99%

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Vertical-cavity optical AND gate

Wen

Sanchez

Groß

et al. 2003

Optics Communications

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Section: Theorymentioning

confidence: 93%

Section: Theorymentioning

confidence: 99%

Vertical-cavity optical AND gate

Wen

Sanchez

Groß

et al. 2003

Optics Communications

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“…The advantage of DFB laser diode is clear on optical communications, important bistability reports on transmission and reflection configuration, both needed for our sensor device can be found on [13][14], We have also analysis how respond a DFB laser on our basic structure, used by as for optical computing 15 and sensors. A comparison between noise present in a DFB and FP laser structure can be found on [16].…”

Section: Semiconductor Laser As Shift Wavelength Sensormentioning

confidence: 99%

Optical bistable devices as sensing elements

González‐Marcos

Hurtado

Martin-Pereda

2004

Unmanned/Unattended Sensors and Sensor Networks

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The nonlinear optical properties of many materials and devices have been the main object of research as potential candidates for sensing in different places. Just one of these properties has been, in most of the cases, the basis for the sensing operation. As a consequence, just one parameter can be detected. In this paper, although just one property will be employed too, we will show the possibility to sense different parameters with just one type of sensor. The way adopted in this work is the use of the optical bistability obtained from different photonic structures. Because this optical bistability has a strong dependence on many different parameters the possibility to sense different inputs appears. In our case, we will report the use of some non-linear optical devices, mainly Semiconductor Optical Amplifiers, as sensing elements. Because their outputs depend on many parameters, as the incident light wavelength, polarization, intensity and direction, applied voltage and feedback characteristics, they can be employed to detect, at the same time, different type of signals. This is because the way these different signals affect to the sensor response is very different too and appears under a different set of characteristics.

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“…When an optical signal enters the SLA the amplifier internal power increases and, in appropriate conditions, the optical gain saturates, which makes the Bragg resonance shift towards the input signal wavelength. As a result, the internal power increases even more and the refractive index continues to increase as well [6]. Such positive feedback loop results in a sudden increase in the internal power and consequently, an upward jump in the output power from the SLA, which causes the switching performance.…”

mentioning

confidence: 97%

Optical bistability and switching performance in QWS distributed coupling coefficient DFB SLA’s

Tahvili

Sheikhi

2008

2008 10th Anniversary International Conference on Transparent Optical Networks

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Optical bistability (OB) behavior in quarter-wave-shift (QWS) distributed coupling coefficient (DCC) distributed feedback (DFB) semiconductor laser amplifiers (SLA's) is investigated. The simulations are based on a modified transfer-matrix method, which considers grating non-uniformities along the structure as well as gain saturation effect. Switching characteristics, including structural dependence of OB in QWS DCC DFB SLA's is demonstrated in the steady state regime. Time-dependent analysis of OB is performed as well, and the dynamics of optical switching is demonstrated. Keywords: distributed coupling coefficient (DCC), distributed feedback (DFB), dynamical analysis, optical bistability, optical switching, semiconductor laser amplifier (SLA). INTRODUCTIONDistributed feedback (DFB) structures are considered as one of the key elements for optical communication systems. They are already in use as single mode laser sources and have the potential to serve as the basis of alloptical processing components. In DFB semiconductor laser amplifiers (SLA's) the inherent optical gain is accompanied by an internal filtering effect and a strong nonlinear phenomenon, which makes them act as functional devices for applications in optical switching and photonic logic [1]- [4]. The nonlinear effect in SLA's arises from mutual changes in the gain and refractive index of the optically active medium, caused by carrier density dependence [5], and results in regions of dispersive bistability. Optical bistability (OB) in DFB SLA's involves a feedback procedure including the gain-dependent refractive index, a Bragg resonance, and the internal optical intensity. When an optical signal enters the SLA the amplifier internal power increases and, in appropriate conditions, the optical gain saturates, which makes the Bragg resonance shift towards the input signal wavelength. As a result, the internal power increases even more and the refractive index continues to increase as well [6]. Such positive feedback loop results in a sudden increase in the internal power and consequently, an upward jump in the output power from the SLA, which causes the switching performance. It is quite common to represent the dispersive OB behavior with the aid of an input-output intensity hysteresis curve.The switching action is the functional basis of several required applications in the field of all-optical signal processing. Since each application has unique requirements, it is desirable to express switching characteristics in terms of amplifier's bistability hysteresis, and also to have a means of tailoring the bistability behavior to fit the application. The object of this paper is to represent the OB switching performance of quarter-wave-shift (QWS) distributed coupling coefficient (DCC) structures. For the first time, the structural dependence of switching characteristics of optical bistability in DCC DFB SLA's, and the optical switching dynamics is investigated.

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Effect of chirped gratings on reflective optical bistability in DFB semiconductor laser amplifiers

Cited by 35 publications

References 21 publications

Vertical-cavity optical AND gate

Vertical-cavity optical AND gate

Optical bistable devices as sensing elements

Optical bistability and switching performance in QWS distributed coupling coefficient DFB SLA’s

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Effect of chirped gratings on reflective optical bistability in DFB semiconductor laser amplifiers

Cited by 35 publications

References 21 publications

Vertical-cavity optical AND gate

Vertical-cavity optical AND gate

Optical bistable devices as sensing elements

Optical bistability and switching performance in QWS distributed coupling coefficient DFB SLA&#x2019;s

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Optical bistability and switching performance in QWS distributed coupling coefficient DFB SLA’s