Improved performance of complex gain-coupled DFB laser by using tapered grating structure

Aliannezhadi, Maryam; Shahshahani, Fatemeh; Ahmadi, Vahid

doi:10.1007/s11082-011-9522-3

Cited by 6 publications

(2 citation statements)

References 22 publications

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“…For example, BEM has a very high accuracy, which is very useful in various laser and optical problems 33 – 35 . TMM is also one of the most powerful, fast, and, accurate methods for modeling periodic structures like distributed feedback (DFB) lasers, distributed Bragg reflectors (DBR), and optical sensors based on photonic crystals 36 – 38 . The transfer matrix of each layer is as follows: where , represents the layer number, is the thickness of the layer , is the wavelength of light in air, and can be calculated using Snell–Descartes law: where and are the refractive index of air and the layer , respectively.…”

Section: Theory and Methodsmentioning

confidence: 99%

Highly sensitive asymmetric and symmetric cancer sensors with ultra-high-quality factor and resolution power

Sovizi

Aliannezhadi

2023

Sci Rep

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In the paper, we proposed two new highly sensitive and compact biosensors with ultra-high-quality factors based on the 1-D binary photonic crystal (silicon/air thin layer) with a defect layer. The proposed asymmetric and symmetric biosensors have just a few periods (two to five) on both sides of the defect layer and the normal cell group (INOK) and cancer cells group (YD-10B) are considered for the studies. The effects of different parameters including silicon layer thickness, air layer thickness, defect layer thickness, substrate position, number of periods, and light incident angle are considered in the biosensor operation and the biosensors are optimized based on the sensitivity. The results demonstrate that the sensitivity and defect mode wavelength of the sensors are independent of the substrate position. However, the quality factor and FOM of the sensors significantly depend on the substrate position and they are improved significantly in the symmetric sensor (~ 37% improvement in optimum condition). Also, the high sensitivities of the sensors are maintained over a wide range of silicon and air thicknesses, which is a valuable achievement in the manufacturing process. Furthermore, the sensitivity of the optimized biosensors with a defect layer thickness of 10 microns and only two periods reaches S ~ 2811 nm/RIU which is an excellent sensitivity for an optical biosensor.

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Section: Theory and Methodsmentioning

confidence: 99%

Highly sensitive asymmetric and symmetric cancer sensors with ultra-high-quality factor and resolution power

Sovizi

Aliannezhadi

2023

Sci Rep

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“…Therefore, Introducinga / 4  phase shift in the grating structure is effective for achieving stable signal mode operation because of high side mode suppression ratio [13][14]. However, the presence of the phase shift when the coupling coefficient is large or at higher injection currents, generally causes spatial non uniformities of photon and carrier densities or effective index along the cavity [15], this phenomenon called spatial hole burning (SHB) effect [16], This SHB is found to enhance the side mode.…”

Section: Introductionmentioning

confidence: 99%

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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Electrically Injected Metamaterial Grating DFB Laser Exploiting an Ultra‐High Q Electromagnetic Induced Transparency Resonance for Spectral Selection

Dubrovina,

Liang,

Gaimard

et al. 2024

Adv Funct Materials

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The study shows that, in waveguide (WG) configuration, the coupling of a 2D plasmonic metamaterial grating (MMG) having a conventional Bragg period along the guide but a distinct period along the transverse axis can lead to Electromagnetically‐Induced‐Transparency (EIT) behavior. This epitomizes that metamaterials, as functional photonic building blocks, can lead to low losses in many standard devices if properly designed. The study reported the observation in passive WGs of a marked Fano‐type EIT resonance with record high‐quality factor: Q = 5000 and contrast >20 dB. Unlike any standard metal grating, MMG‐assisted waveguides exhibit strong grating coupling strength and low‐loss properties simultaneously. This concept is further applied to demonstrate single‐frequency‐emission electrically‐injected Distributed Feedback (DFB) lasers in the near‐infrared telecom domain. The key point is that laser emission occurs at the peak of EIT, i.e., the maximum in transmission. It therefore addresses one of the main critical issues of DFB lasers related to the single frequency yield. The laser performances are state‐of‐the‐art (Ith < 20 mA, Pmax > 20 mW at I = 200 mA, SMSR > 50 dB, optical feedback tolerance >−21 dB compliant with IEEE 802.3 standard). The presented approach, compatible with existing industrial technologies, is promising for real‐life telecom applications.

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Improved performance of complex gain-coupled DFB laser by using tapered grating structure

Cited by 6 publications

References 22 publications

Highly sensitive asymmetric and symmetric cancer sensors with ultra-high-quality factor and resolution power

Highly sensitive asymmetric and symmetric cancer sensors with ultra-high-quality factor and resolution power

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

Electrically Injected Metamaterial Grating DFB Laser Exploiting an Ultra‐High Q Electromagnetic Induced Transparency Resonance for Spectral Selection

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