Generation of single femtosecond pulses by hybrid mode-locking of a semiconductor laser

Weber, A.; Schell, Martin; Fischbeck, G.; Bimberg, D.

doi:10.1109/3.159529

Cited by 46 publications

(6 citation statements)

References 20 publications

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“…Hybrid active/passive mode locking, in which the action of gain modulation is assisted by the presence of a saturable absorber, has been reported by many authors [229][230][231][232][233][234][235][236]. In early studies, an external cavity arrangement containing two purely optically coupled lasers, each with separate electrical driving circuits, was used [229,230].…”

Section: Intensitymentioning

confidence: 99%

Fast phenomena in semiconductor lasers

2000

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Although diode lasers are almost ideal sources for ultrahigh-speed data communication systems, system performance remains critically dependent on the quality of the optical pulses that they generate. Uniquely among lasers, the output power can be modulated directly by modulating the diode current. However, this leads to relaxation oscillations and a roll-off at high frequencies that is superimposed on the frequency response of the drive circuit. This is limited by parasitics and maximum modulation frequencies range from 1 to 70 GHz, depending on the type of laser and its packaging. The higher values are obtained with short cavity lengths and tight optical confinement, the highest frequencies being achieved in vertical-cavity devices. Modulation bandwidth is usually limited by circuit parasitics, device heating and the maximum power-handling capability of the laser facets.The generation of picosecond and femtosecond pulses demands special techniques and three-gain switching, Q-switching and mode locking-are discussed in detail, with their relative advantages and disadvantages compared. Very short pulses inherently contain a significant spread of wavelengths and their generation requires the optical gain in the laser medium to extend across that wavelength range. While diode lasers satisfy this criterion better than many other types, the effect of gain non-linearities and carrier-transport effects prevent the Fourier-transform limit from being achieved in practice. As a result, external pulse-compression techniques, which exploit the detailed temporal and spectral properties of the laser pulses, such as frequency chirping, self-phase modulation and group velocity dispersion, are becoming more important, and diode lasers are increasingly challenged as primary sources by compact, efficient, diode-pumped solid-state lasers.The paper summarizes the levels of maximum pulse power and minimum duration that have been achieved using the various techniques.

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Section: Intensitymentioning

confidence: 99%

Fast phenomena in semiconductor lasers

2000

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“…Probably the most efficient mechanism to obtain very short optical pulses is the mode-locking technique. 1,2,[7][8][9] Pulses as short as few femtoseconds can be obtained. However, it is more complex than the gainswitching and has the limitation of a fixed modulation rate.…”

Section: Departament De Física Universitat De Les Illes Balears E-0mentioning

confidence: 98%

Pulse width reduction in single mode diode lasers via external injection of optical pulses

Mirasso

1995

Applied Physics Letters

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We propose and numerically study a simple scheme to obtain large pulse-width reduction of optical pulses generated by semiconductor lasers. The scheme consists of modulating two single-mode semiconductor lasers coupled through a normal dispersion fiber. The optimal pulse compression is obtained for a particular range of phase delay between the two modulated electrical injection currents. In addition, the optical pulses so obtained have a larger output power and are very close to transform-limited as required for soliton communication systems.

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“…With this set-up a high reliable and easy to use source for pump-and-probe experiments is made available. In first experiments this set-up has proven its suitability as a source in an electro-optical sampling system We also simulated the soliton propagation and narrowing with the equation +Lfl _A2A) (6) 2 2 6 5T 2 oTr or describing the pulse propagation in real fibers, taking into account also the nonlinear effects 13 This equation was solved numerically using the split-step Fourier method described in 13 As input pulse we used the calculated complex amplitude function from section 5 with a pulse energy of3.36 pJ, as measured after the filter. For the simulation ofthe amplification in the 2nd EDFA a total fiber length of 24 m with a fiber diameter of 6 im was assumed.…”

Section: Set-up For Pump-and-probe Experimentsmentioning

confidence: 99%

<title>Generation of pico- and femtosecond-wavelength tunable optical pulses with self-seeded laser diodes</title>

Huhse

Reimann

Boettcher

et al. 2001

Laser Optics 2000: Semiconductor Lasers and Optical Communication

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A simple way to generate wavelength tunable (Ak > 50 nm) semiconductor laser pulses with a width (FWHM) of a few hundred femtoseconds and a timing jitter well below 1 ps is self-seeding of a gain-switched Fabry-Perot laser diode with subsequent chirp compensation and soliton compression. The low timing jitter of the single mode laser pulses allows selfseeding to be used e.g. in high temporal resolution electro-optic sampling systems. Additionally, by controlling the electrical phase delay between two self seeded laser diodes femtosecond pulses with electrically adjustable time delay can be generated.

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Generation of single femtosecond pulses by hybrid mode-locking of a semiconductor laser

Cited by 46 publications

References 20 publications

Fast phenomena in semiconductor lasers

Fast phenomena in semiconductor lasers

Pulse width reduction in single mode diode lasers via external injection of optical pulses

<title>Generation of pico- and femtosecond-wavelength tunable optical pulses with self-seeded laser diodes</title>

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