FM response of quantum-well lasers taking into account carrier transport effects

Precise measurement of semiconductor laser chirp using effect of propagation in dispersive fiber and application to simulation of transmission through fiber gratings

“…Equation (3) indicates that, in addition to the PIR of the laser, the dispersion and the asymmetry of the optical filter around the laser frequency determine the extent of FMto-IM conversion. In the case of dispersive fiber, the optical transfer function can be approximated by with .…”

“…The baseband transfer function after transmission through the grating is obtained from (3). As an example, transmission through an unchirped fiber grating whose Bragg frequency coincides with the laser frequency will result in no FM-to-IM conversion, because in this case and therefore…”

Measurement and characterization of laser chirp of multiquantum-well distributed-feedback lasers

“…Finally, the laser linewidth is also affected by the changes in carrier density in the barrier as follows: (9) where is the Shallow-Townes linewidth. Equation (3) indicates that the carrier density in the barrier, , is comprised of two terms. The first one follows the dynamics of the carrier density in the well and results in an increase in the effective linewidth enhancement factor obtained from measurement of the linewidth by a factor , as observed in (9).…”

“…Although some analytical expressions have been proposed to model the CIR of DFB lasers, in practice it is necessary to perform numerical simulations to determine the laser chirp precisely. On the other hand, a simplified model has been proposed that accurately explains the carrier dynamics of MQW lasers and results in analytical expressions for the intensity modulation (IM) [2] and frequency modulation (FM) [3] of the laser.…”

Letter: Impact of double cavity FP demultiplexers on the performance of WDM dispersion supported transmission

“…Each one of the three optical transmitters consists of a laser driver and a multiquantum-well distributed feedback (MQW-DFB) laser. Each MQW-DFB laser is assumed to be directly modulated and the quantum-well laser dynamics has been modelled using the rate equation model proposed in [5 ]. The emission wavelengths of lasers 1,2, and 3 were 1533 nm (channel l), 1532 nrn (channel 2), and 1531 nm (channel 3), respectively.…”