By W. T. Tsang
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Additional resources for Lightwave Communications Technology, Part B: Semiconductor Injection Lasers
33) yielding three eigenvalue equations that correspond to the to,t', and t2 terms and cop = (gM)'/4(wm0,)'''. (37) The pulse envelope has a Gaussian time dependence and the FWHM is given by zp = 2 m / o p . (38) The pulse width varies inversely with the fourth root of the gain modulation depth product and inversely with the square root of the product of the effective bandwidth and modulation frequency. In the presence of dispersion, cc), is complex, and the imaginary component of wp in Eq. (37) produces a frequency chirping during the pulse.
Laser diode (LD) with self-focusing microlens (SML) external resonator. [From Akiba et al. , 1981) can be used. Such cavities enable one to make a very compact external resonator that will have increased optical stability as well as simplifying the alignment of the reflected beam. , 1981). , 1979); no AR coating was used. The experimental configuration is shown in Fig. 24. 3 GHz with pulses having 29-psec FWHM. Passive mode locking with FWHM pulses of = 30 psec was also observed. 4 GHz were obtained.
The bleaching of the saturable absorber occurs sooner than the depletion of the gain, and this results in a shortening of the pulse periods and an increase in the frequencies. Substituting Eq. (62) into Eq. (61) yields the net gain before the arrival of the pulse + which can be shown to have a negative value. Thus, as shown schematically in Fig. 5, the net gain is negative before the arrival of the pulse, becomes positive at the peak of the pulse, and can be shown to be negative after the pulse.