Abstract
For emerging TWDM-PON systems, based on burst-mode operation over WDM channels, a main challenge is the laser self-heating during bursts. This effect creates a drift of the emission frequency, leading to degraded transmission performances, and perturbation of adjacent channels. We explain an accurate method for characterization of wavelength drift during bursts at a bit time level, and use this method along the paper to characterize frequency drifts in burst-mode operation. First, we present an optimized directly modulated laser design for reduced self-heating, compatible for 100 GHz-spaced systems. Then, we propose a new solution based on counter-heating of the laser with a side heater, enabling to reduce self-heating induced frequency drift. This counter-heating scheme is applied to a standard laser, demonstrating a stringent reduction of frequency drift, and making it compatible for 100-GHz-spaced TWDM-PON transmissions. This simple method opens the way for simple low-cost transmitters in dense and high power TWDM-PON systems.
© 2017 IEEE
PDF Article
More Like This
Cited By
You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.
Contact your librarian or system administrator
or
Login to access Optica Member Subscription
Add to BibSonomy