Low threshold-current, wide tuning-range, butt-joint DBR laser grown with four MOVPE steps

Stoltz, B.; Dasler, M.; Sahlen, O.

doi:10.1049/el:19930469

Cited by 16 publications

(3 citation statements)

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“…In this way large tuning ranges up to 22 nm have recently been realized in the quasi-continuous (i. e. stepwise continuous) tuning mode [20], while the maximum continuous tuning range is around 4.4 nm [18]. Using a four-step MOVPE process and a semi-insulating InP:Fe current-blocking structure an AM modulation bandwidth of 9 GHz and a quasi-continuous tuning range of 9.1 nm were demonstrated with recent 38 DBR lasers [32]. The switching time for the transient between two successive modes can be as small as 500 ps [33].…”

Section: Longitudinally Integrated Structuresmentioning

confidence: 97%

Wavelength Tunable Laser Diodes and Their Applications

Amann¹

1995

Trends in Optical Fibre Metrology and Standards

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Single mode laser diodes with an electronically tunable wavelength are among the key components needed for advanced applications in optical communications, measurement and sensing. In particular, these devices may be used as wavelength controllable transmitters in wavelength division multiplexing or as local oscillators in optical receivers using the coherent detection technique. Furthermore, distance measurements with a high accuracy and large repetition frequency as well as threedimensional viewing are feasible using the frequency modulated continuous wave radar technique in the optical domain. Also numerous measurement techniques in optoelectronics and fiber optics can be performed by means of wavelength tunable lasers. This paper reviews the recent progress made on electronically wavelength tunable laser diodes in the InGaAsP material system at 1.5 11m wavelength. The operation principles and technological approaches of the various device concepts are presented and the laser parameters relevant for anticipated applications, such as tuning range, spectral linewidth and wavelength access, are discussed.The continuous and discontinuous tuning modes are introduced, compared and the physical limitations with respect to the maximum tuning ranges are commented on. Particular attention is paid to device handling and the effort needed for wavelength control which are most important for practical applications.

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Section: Longitudinally Integrated Structuresmentioning

confidence: 97%

Wavelength Tunable Laser Diodes and Their Applications

Amann¹

1995

Trends in Optical Fibre Metrology and Standards

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“…Examples on such lasers are DBR lasers (see e.g. [l], [2]) and tunable twin-guide (TTG) lasers [3]. The structure of the l T G laser is such that a truly continuous tuning can be obtained over the full tuning interval.…”

Section: ~O D U C T I O Nmentioning

confidence: 99%

Complete single mode wavelength coverage over 40 nm with a super structure grating DBR laser

Öberg

Rigole

Nilsson

et al. 1995

J. Lightwave Technol.

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The spectral characteristics of a widely tunable super structure grating distributed Bragg reflector (SSG-DBR) laser are investigated and the design considerations of the grating reflectors are given. By systematically adjusting the control currents of the two reflector sections and the phase section it is experimentally shown that every wavelength in an interval of 40 nm can be reached with a side-mode suppression usually better than 30 dB.

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“…Equivalent-circuit models for the most frequently adopted singleequivalent circuit [5,7,8] have been established for a long time, and the model parameters can be formulated in a simple analytical form [7]. To include various high-order parasitic effects, a ladder structure and a transformer-loop structure have been proposed within the framework of the singlemodel [9,10].…”

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confidence: 99%

Analysis and selection of optimum driving current combinations for tunable wavelength laser

Lee¹,

Yang²,

Chuang³

et al. 2006

Micro & Optical Tech Letters

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We present a demodulation technique to synthesise the physical parameters of an optical fibre Bragg grating (FBG) resonant cavity. The demodulation is achieved through a genetic algorithm (GA INTRODUCTIONIn the past, the all in-fibre resonators have been used for several different applications, from sensors to fibre laser resonators [1]. Recently, we have shown the possibility of realizing optical clock recovery recurring to ring lasers by using an intracavity gain clamped semiconductor optical amplifier and a resonant cavity based on Bragg gratings and on tuneable resonant cavities [2, 3].The correct extraction of parameters for a single fibre Bragg grating (FBG) or grating structures is of high relevance for device design and system simulation [4]. Several techniques have been proposed for the demodulation of FBG parameters [5 and references therein]. All of these require previous knowledge of the amplitude and phase spectrum. The experimental measurement of the latte is quite complex and has implicit an error when determined experimentally. These errors will propagate through the recovered parameters.Recently, Caucheteur et al. proposed a demodulation technique for fibre cavity resonators based uniquely on the adjustment of the amplitude spectrum [5]. However, for that propose a Nelder-Mead simplex algorithm was used, which has small robustness with respect to the initial parameters. Skaar et al. proposed the usage of a genetic algorithm for the reconstruction of FBG-based sensors [6].In this paper we propose, for the first time, utilization of a genetic algorithm (GA) to achieve the demodulation of a resonant cavity based on FBGs. RESONANT CAVITYThe resonant cavity was developed inscribing two low-reflectivity FBGs, approximately 1-cm apart, in a commercial high borongermanium co-doped optical fibre (Fibercore PS1250/1500). The fibre was placed on a motorized translation stage, thus allowing an , recurring to the phase-mask method. The experimental conditions were kept constant during the writing process, so it was expected that the parameters values for both gratings would be kept approximately constant. The cavity-reflection spectrum was measured using the phase-shift method, and a total of 311 data points were measured.The cavity complex reflection spectrum, for weak grating pairs, can be given bywhen r 1 () and t 1 () the reflection and transmission of the first grating, respectively. r 2 () is the reflection of the second grating, d represents the intragrating spacing, and n eff is the effective refraction index. The uniform grating reflection or transmission can be obtained analytically [7]. The objective is to find the cavity and FBG parameters coefficient that produce a reflection coefficient as close as possible to the target spectrum. To determine the correct parameters, we have implemented an algorithm which minimizes the errors between the measured spectrum and the analytical one, generated by Eq. (1), using a GA. The GA is an optimization method that requires only the information of the...

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Low threshold-current, wide tuning-range, butt-joint DBR laser grown with four MOVPE steps

Cited by 16 publications

References 0 publications

Wavelength Tunable Laser Diodes and Their Applications

Wavelength Tunable Laser Diodes and Their Applications

Complete single mode wavelength coverage over 40 nm with a super structure grating DBR laser

Analysis and selection of optimum driving current combinations for tunable wavelength laser

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