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Authors: A. Abbasi, G. Roelkens, G. Morthier
Title: Optimization of an Asymmetric DFB Laser Used as All-Optical Flip-Flop
Format: International Journal
Publication date: 2/2015
Journal/Conference/Book: IEEE Journal of Quantum Electronics
Editor/Publisher: IEEE, 
Volume(Issue): 51(2)
Internal Reference: [N-1710]
Download: Download this Publication (1.4MB) (1.4MB)

Abstract

We have numerically optimized the speed of an all-optical flip-flop based on an AR-coated λ/4 phase shifted DFB laser. Numerical results show that by engineering the grating of the DFB laser and making the coupling coefficient asymmetrical, fall times reduce by a factor of 2 compared to a standard laser design. It is also shown that the confinement factor in the quantum wells and the length of the laser cavity have a significant impact on the flip-flop operation. The switching between two states can be realized using pulses with energies below 125 fJ and with a duration of 10 ps. The switching time can be reduced to 5 ps and the switching rate increased up to 10 GHz.

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