Abstract
The unapodized and apodized step-chirped gratings (SCGs) for broadband frequency
converters based on quasi-phase-matched second-harmonic generation with pump depletion
in lithium niobate waveguides have been theoretically modeled and simulated as a
function of the number of sections, and compared with the linearly chirped gratings
(LCGs) for the first time to our knowledge. It is shown that for the same length, using
fewer sections with more segments and larger amounts of chirp, the efficiency and
bandwidth of an SCG approach over that of an LCG and can be extensively improved with
apodization. Moreover, the increasing chirp period and duty cycle for the SCG structure
may provide a more convenient method for fabrication and poling. In addition, we present
useful relations for the bandwidths that help to find the appropriate number of segments
in the proposed SCGs of a given length.
© 2008 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