The design assessment of lambda /4 phase-shifted DFB laser structures

Whiteaway, J.E.A.; Thompson, G.H.B.; Collar, A.J.; Armistead, C.J.

doi:10.1109/3.29257

Cited by 138 publications

(37 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…While low κL-values do not provide enough longitudinal mode selectivity, high κL-values are associated with a strong longitudinal variation of the optical field intensity and thus cause spatial hole burning, which reduces the longitudinal SMSR. In lasers with phase-shift sections and κL > 3 the optical field intensity is high around the phase-shift section, causing severe hole burning, which enhances the probability of side mode lasing (Whiteaway et al 1989). A moderate κL-product (of about 1.25) has been proposed as optimum for a phase-shifted DFB laser with perfect AR coatings (Soda et al 1987).…”

Section: Guidelines For Ensuring Single-longitudinal-mode Operationmentioning

confidence: 99%

Optical modeling of laterally-corrugated ridge-waveguide gratings

et al. 2008

View full text Add to dashboard Cite

The paper presents some model improvements for the optical simulation of laterally-corrugated ridge-waveguide distributed feedback lasers. Simulation results are discussed and design principles for achieving single-longitudinal-mode operation are outlined. The effects of the laterally-corrugated ridge geometry both on the coupling coefficient and on the Bragg wavelength of different transverse modes are presented. The improved modeling has been used to design 980 nm distributed feedback lasers with laterally-corrugated ridge-waveguide third-order gratings. The lasers fabricated using nanoimprint lithography exhibited single-mode operation with 50 dB side-mode suppression ratio.

show abstract

Section: Guidelines For Ensuring Single-longitudinal-mode Operationmentioning

confidence: 99%

Optical modeling of laterally-corrugated ridge-waveguide gratings

et al. 2008

View full text Add to dashboard Cite

show abstract

“…The spectra of the two DFB lasers can be calculated based on the model in [22,23], as shown in Figure 7. The equivalent three phase shifts DFB semiconductor laser performs nearly the same as the other one.…”

Section: Analysis Of the Three Phase Shifts Dfb Laser Based On Rec Tementioning

confidence: 99%

Numerical study of three phase shifts and dual corrugation pitch modulated (CPM) DFB semiconductor lasers based on reconstruction equivalent chirp technology

Shi

et al. 2010

Chin. Sci. Bull.

View full text Add to dashboard Cite

A distributed feedback (DFB) semiconductor laser with three phase shifts based on reconstruction equivalent chirp (REC) technology is proposed and investigated numerically. With the combination of multiple phase shifts and corrugation pitch modulated (CPM) structure, we also propose a novel and more complex structure named dual CPM, which has a flatter light power distribution along the laser cavity compared with the true double phase shifts DFB laser diode (LD), while the P-I curves are nearly the same. The proposed dual CPM structure is also designed and analyzed based on REC technology. The simulation results show that, the DFB semiconductor laser with complex structure such as phase shifts, or even arbitrary variation of the grating period can be achieved equivalently and easily by changing the sampling structure. But its external characteristics are almost the same as those DFB lasers with true phase shifts, or true arbitrary variation of the grating period. The key advantage of the REC technology is that it varies only the sampling structure and keeps the seed grating (actual grating in sampling structure) period constant. So its fabrication needs only low-cost and standard holographic exposure technology. Therefore we believe this method can achieve the high-end and low-cost DFB LD for mass production. semiconductor laser, distributed feedback (DFB), multiple phase shifts, corrugation pitch modulated (CPM), reconstruction equivalent chirp (REC) Citation: Shi Y C, Tu X H, Li S M, et al. Numerical study of three phase shifts and dual corrugation pitch modulated (CPM) DFB semiconductor lasers based on reconstruction equivalent chirp technology.

show abstract

“…Much of the work done up to the present time is based on the onedimensional theory, particularly in the more complicated cases of λ/4-shifted DFB lasers [6,7], DFB lasers with axially-varying parameters [8], and multielectrode DFB lasers. In addition, there is an enormous amount of work in which one-dimensional theory is used in nonlinear models of such effects as gain saturation, spectral and spatial hole-burning, filamentation and many others.…”

Section: Introductionmentioning

confidence: 99%

A Rigorous, Coupled-Wave Transfer Matrix Method for Two-Dimensional Threshold Analysis of Distributed Feedback Semiconductor Lasers

Abouelsaood

El‐Naggar

2004

J Comput Electron

View full text Add to dashboard Cite

A rigorous, truly two-dimensional method for threshold analysis of distributed feedback (DFB) lasers based on a coupled wave transfer matrix formalism is presented. The method makes it possible to systematically study the effect of the various structural and material properties parameters of the laser on the threshold gain and lasing frequency. Since the optical fields inside and outside the laser are very accurately represented in our analysis, the small differences in gain of pairs of longitudinal laser modes symmetrically located on both sides of the gap can be more accurately calculated than in any previous work. The analysis is applicable to gratings of any shape for both the TE and TM modes, but numerical results are given only for first-order gratings with rectangular and triangular tooth-shape. Reflectivities of the laser end facets have been calculated from first principles in some typical cases rather than treated as given parameters.

show abstract

The design assessment of lambda /4 phase-shifted DFB laser structures

Cited by 138 publications

References 31 publications

Optical modeling of laterally-corrugated ridge-waveguide gratings

Optical modeling of laterally-corrugated ridge-waveguide gratings

Numerical study of three phase shifts and dual corrugation pitch modulated (CPM) DFB semiconductor lasers based on reconstruction equivalent chirp technology

A Rigorous, Coupled-Wave Transfer Matrix Method for Two-Dimensional Threshold Analysis of Distributed Feedback Semiconductor Lasers

Contact Info

Product

Resources

About