Chirp-managed directly modulated laser (CML)

We demonstrate a new highly dispersion tolerant modulation format using a chirp-managed directly modulated laser (CML) for uncompensated 10-Gb/s transmission over >200 km at 1.55 μm. The CML consists of a distributed feedback (DFB) laser followed by an optical filter. We show that the combination...

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Bibliographic Details
Published in:IEEE photonics technology letters 2006-01, Vol.18 (2), p.385-387
Main Authors: Matsui, Y., Mahgerefteh, D., Xueyan Zheng, Liao, C., Fan, Z.F., McCallion, K., Tayebati, P.
Format: Article
Language:English
Subjects:
AM to FM conversion
Amplitude modulation (AM)
bandpass filter
Chirp
Chirp modulation
direct modulation
Dispersions
Distributed feedback devices
distributed feedback lasers
duobinary
FM to AM conversion
Frequency modulation
frequency modulation (FM)
High speed optical techniques
Laser feedback
Lasers
Modulation
Optical attenuators
Optical feedback
Optical filters
Optical receivers
Optical transmitters
Phase transformations
Tolerances
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Summary:We demonstrate a new highly dispersion tolerant modulation format using a chirp-managed directly modulated laser (CML) for uncompensated 10-Gb/s transmission over >200 km at 1.55 μm. The CML consists of a distributed feedback (DFB) laser followed by an optical filter. We show that the combination of adiabatic chirp from the DFB and filter edge response produces high extinction ratio pulses with nearly uniform phase, abrupt phase shifts at bit transitions, and a correlation between the 1 bits; 1 bits separated by odd number of 0 bits are /spl pi/ out of phase. This results in carrier suppression, 1/2 the bandwidth of standard nonreturn-to-zero, and high tolerance to positive and negative dispersion.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2005.862358