Effects of Asymmetric Grating Structures on Output Efficiency and Single Longitudinal Mode Operation in $\lambda/4$-Shifted DFB Laser

Kwon, Oh‐Kyong; Leem, Young Ahn; Lee, Dong Hun; Lee, Chul Wook; Baek, Yong Soon; Chung, Yun Chur

doi:10.1109/jqe.2011.2160617

Cited by 24 publications

(17 citation statements)

References 14 publications

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“…According to the analysis in [6], this structure also owns good SLM property. Figure 2 is the simulated internal light power distribution along the cavity.…”

Section: A Asymmetrically Phase-shifted Dfb Laser and Laser Arraymentioning

confidence: 91%

“…The optimized structural parameters are also well studied [6]. To verify the effect of AEPS, we simulated lasers with AEPS and symmetric equivalent phase shift (SEPS), respectively, by using the transfer matrix method (TMM) [11].…”

Section: A Asymmetrically Phase-shifted Dfb Laser and Laser Arraymentioning

confidence: 99%

“…Especially for lasers with a long cavity, the slope efficiency is already low, and the reduced efficiency of the AR/AR coating will further limit its applications. Therefore, the asymmetries in gratings are usually applied in the design, such as an asymmetrical phase shift and asymmetrical coupling coefficient [6]. However, these structures highly increase the complexity of the grating, which is difficult to fabricate, and the applications are still limited.…”

Section: Introductionmentioning

confidence: 99%

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Study of multiwavelength DFB semiconductor laser array with asymmetric structures based on sampling technique

Shi

Cao

et al. 2014

Appl. Opt.

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Multiwavelength distributed feedback (DFB) semiconductor laser arrays (MLA) with asymmetric structures are studied in this paper. Thanks to the sampling technique, the asymmetric structures, including asymmetric phase shift and asymmetric coupling coefficient, can be achieved by common holographic exposure. Therefore, the cost of fabrication is remarkably reduced. In addition, due to the large scale of the sampling pattern, the wavelength precision of these kinds of MLA can be simultaneously improved. As an example, we designed and fabricated an asymmetrically phase-shifted MLA with 10 wavelengths for the first time. Compared with the common phase-shifted DFB laser, slope efficiency is significantly improved and single longitudinal mode is still guaranteed. Besides, relatively high wavelength precision is also obtained. The proposed MLA configurations may significantly benefit multiwavelength emitters for future photonic integration.

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“…According to the analysis in [6], this structure also owns good SLM property. Figure 2 is the simulated internal light power distribution along the cavity.…”

Section: A Asymmetrically Phase-shifted Dfb Laser and Laser Arraymentioning

confidence: 91%

Section: A Asymmetrically Phase-shifted Dfb Laser and Laser Arraymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of multiwavelength DFB semiconductor laser array with asymmetric structures based on sampling technique

Shi

Cao

et al. 2014

Appl. Opt.

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“…3(b). Because the SLM property is not degenerated as was analyzed before, this is advantageous for the integrated laser array sources as more light can be extracted out from one facet [22]. The internal light distributions with different injection current levels are plotted in Fig.…”

Section: Laser Performances Above Thresholdmentioning

confidence: 99%

Improved Single-Mode Property of DFB Semiconductor Laser Based on Sampling Technique Using Chirp Compensation

et al. 2015

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A DFB semiconductor laser with a bent waveguide and an equivalent chirp compensation based on the sampled grating technique is proposed to improve the single longitudinal mode (SLM) performance for the first time. In such a structure, the bent waveguide is used to form the basically chirped grating so that the zeroth-order resonance is greatly suppressed. However, for the Àfirst-order resonance, the equivalent chirp by designing the sampling pattern is used to compensate the chirp in the Àfirst subgrating caused by bent waveguide. As a result, the Àfirst-order resonance is enhanced, whereas the zeroth resonance is well suppressed. Since the wavelength spacing between the zeroth and Àfirst subgrating can be reduced by adopting this method, the sampling period can be increased. Therefore, the corresponding line in photomask can be enlarged as well to ease the fabrication, and the lasing wavelength accuracy can be further improved according to the theoretical analysis. Because the lasing wavelength can be controlled by changing the sampling period, the performances of the multiwavelength DFB laser array can also be improved using this method.

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“…In a DFB laser, an asymmetric coupling coefficient (ACC) can be used to increase the front facet output power as well as the single mode stability at high drive current [17]. In this section we will present a DFB laser with ACC in order to enhance the all-optical switching properties.…”

Section: Influence Of the Asymmetric Coupling Coefficientmentioning

confidence: 99%

Optimization of an Asymmetric DFB Laser Used as All-Optical Flip-Flop

Abbasi

Roelkens

Morthier

2015

IEEE J. Quantum Electron.

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Abstract-We have numerically optimized the speed of an all-optical flip-flop based on an antireflection-coated λ/4 phaseshifted distributed feedback (DFB) laser. Numerical results show that by engineering the grating of the DFB laser and making the coupling coefficient asymmetrical, fall times reduce by a factor of 2 compared with a standard laser design. It is also shown that the confinement factor in the quantum wells and the length of the laser cavity have a significant impact on the flip-flop operation. The switching between two states can be realized using pulses with energies below 125 fJ and with a duration of 10 ps. The switching time can be reduced to 5 ps and the switching rate increased up to 10 GHz.Index Terms-All-optical flip-flops, distributed feedback (DFB) lasers, optical bistability.

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Effects of Asymmetric Grating Structures on Output Efficiency and Single Longitudinal Mode Operation in $\lambda/4$-Shifted DFB Laser

Cited by 24 publications

References 14 publications

Study of multiwavelength DFB semiconductor laser array with asymmetric structures based on sampling technique

Study of multiwavelength DFB semiconductor laser array with asymmetric structures based on sampling technique

Improved Single-Mode Property of DFB Semiconductor Laser Based on Sampling Technique Using Chirp Compensation

Optimization of an Asymmetric DFB Laser Used as All-Optical Flip-Flop

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