z-logo
open-access-imgOpen Access
High-speed data format conversion from non-return-to-zero to return-to-zero based on periodically poled lithium niobate waveguides
Author(s) -
Dalin Wang,
Junqiang Sun,
Jian Wang
Publication year - 2008
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.57.252
Subject(s) - lithium niobate , return loss , mach–zehnder interferometer , energy conversion efficiency , optics , interferometry , waveguide , wavelength , signal (programming language) , bandwidth (computing) , physics , materials science , optoelectronics , telecommunications , computer science , antenna (radio) , programming language
Based on the cascaded second-order nonlinear interactions in a periodically poled lithium niobate waveguide, a novel scheme of all-optical data format conversion from non-return-to-zero to return-to-zero is proposed, using a Mach-Zehnder interferometer structure. The conversion mechanism relies on the amplification effect induced on the signal field via cascaded second-harmonic generation and difference-frequency generation, which makes the Mach-Zehnder interferometer unbalanced and leads to the output of return-to-zero due to destructive interference. Firstly, the non-return-to-zero to return-to-zero conversion process is numerically simulated based on the coupled-wave equations. Secondly, the dependence of the extinction ratio on the waveguide length, optical power, and time-delay is analyzed and optimized. Finally, the conversion bandwidth is also discussed. It is found that the signal wavelength can be tuned in a wide wavelength range of approximately 90nm, thus simultaneous multi-channel non-return-to-zero to return-to-zero data format conversion can potentially be implemented with the proposed scheme.

The content you want is available to Zendy users.

Already have an account? Click here to sign in.
Having issues? You can contact us here