Direct modulation and mode locking of 1.3 μm quantum dot lasers

Details Direct modulation and mode locking of 1.3 μm quantum dot lasers Direct modulation and mode locking of 1.3 μm quantum dot lasers

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004njph....6..181k&link_type=abstract

New Journal of Physics, Volume 6, Issue 1, pp. 181 (2004).

Physics

12

Scientific paper

We report 7 GHz cut-off frequency, 2.5 and 5 Gb s-1 eye pattern measurements upon direct modulation of 1.3 μm quantum dot lasers grown without incorporating phosphorus in the layers. Passive mode-locking is achieved from very low frequencies up to 50 GHz and hybrid mode-locking is achieved up to 20 GHz. The minimum pulse width of the Fourier-limited pulses at 50 GHz is 3 ps, with an uncorrelated timing jitter below 1 ps. The lasers are optimized for high frequency operation by a ridge waveguide design that includes etching through the active layer and ridge widths down to 1 μm. The far-field shape for 1 μm is close to circular with a remaining asymmetry of 1.2.

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