Dynamic response of QWS-DFB lasers with convex tapered grating structure and non-zero facet reflection

Bazhdanzadeh, N.; Ahmadi, Vahid; Ghafoorifard, Hassan; Shahshahani, Fatemeh

doi:10.1016/j.sse.2007.09.004

Cited by 3 publications

(2 citation statements)

References 8 publications

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“…reflection and compare the obtained output power with numerical methods for a DFB laser [16] and finite difference time domain method for a DFB-SOA with spatial chirped grating structure [14]. The results show that the obtained data in comparison to represented data in mentioned references have acceptable accuracy.…”

Section: Theoretical Backgroundmentioning

confidence: 82%

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Large signal analysis of distributed feedback laser with three types spatial chirped grating and high reflection: Anti reflection facets

Jabbari¹,

Nafar²,

Bahmani-Firouzi³

2013

IETE J Res

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In this paper, based on the coupled mode and carrier rate equations, the effects of different types of spatial chirped grating on a laser with distributed feedback (DFB), λ/4 phase shift, uniform injection current on the laser and high reflection in the rear facet were simulated and investigated for the first time. By using dynamic analysis with improved finite difference time domain (FDTD) numerical method in a single mode DFB laser with two way linear spatial chirped grating, the extinction ratio (ER) and high bit rate as a direct modulator and also making a high output optical power, were computed and analyzed. By adjusting the parameters such as spatial chirped grating, uniform injection current and the other physical parameters, the optical output power and side mode suppression ratio were obtained more than 28 mW and 80 dB respectively. Also by optimizing the physical parameters in DFB laser which is worked as a direct modulator, the bit rate and extinction ratio respectively 15 Gb and 50 dB were obtained. The obtained results from this simulation showed that using the reflection in the rear facet with a two way linear spatial chirped in the waveguide of the DFB laser improved output responses such as output optical power, side mode suppression ratio, (ER) and high bit rate in the direct modulator situation.

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Section: Theoretical Backgroundmentioning

confidence: 82%

“…The expression for Rsp will be given later in our optical gain model. The phase detuning factor from the Bragg wavelength is given as [16]:…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Large signal analysis of distributed feedback laser with three types spatial chirped grating and high reflection: Anti reflection facets

Jabbari¹,

Nafar²,

Bahmani-Firouzi³

2013

IETE J Res

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Dynamic Response of Two-Electrode Distributed Feedback Laser for Stable Signal Mode Operation

Bousseta¹,

Zatni²,

Amghar³

et al. 2015

IJECE

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The longitudinal spatial hole burning (LSHB) effect has been known to limit the performance of distributed feedback (DFB) semiconductor lasers to achieve a better dynamic signal mode operation (DSMO). So, in order to ensure a stable (DSMO), we propose a novel device design of two electrode DFB lasers with longitudinal variation in the coupling coefficient (distributed coupling coefficient (DCC)), the structure also contains a phase shifted in middle of the cavity. By means of the finite difference time domain (FDTD) numerical method, we analyze dynamic response of our structure and we also compare the results with the conventional two electrode DFB laser (TE-DFB). The numerical simulation shows that, a better dynamic signal mode has been achieved by TE-DCC-DFB lasers in comparison with TE-DFB laser due to its better and high side mode suppression ratio (SMSR). Therefore, the TE-DCC-DFB lasers will be useful to extend the transmission distance in optical fiber communication systems.

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Large Signal Analysis of Spatial Chirped Grating Distributed Feedback Laser

Jabbari¹,

Solookinej²

2011

Trends in Applied Sciences Research

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Dynamic response of QWS-DFB lasers with convex tapered grating structure and non-zero facet reflection

Cited by 3 publications

References 8 publications

Large signal analysis of distributed feedback laser with three types spatial chirped grating and high reflection: Anti reflection facets

Large signal analysis of distributed feedback laser with three types spatial chirped grating and high reflection: Anti reflection facets

Dynamic Response of Two-Electrode Distributed Feedback Laser for Stable Signal Mode Operation

Large Signal Analysis of Spatial Chirped Grating Distributed Feedback Laser

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