TY - JOUR
T1 - Bandwidth analysis of waveguide mode converters based on optical analogy of stimulated raman adiabatic passage in engineered multimode waveguides
AU - Hsiao, Fu Chen
AU - Lin, Tzung Yi
AU - Tseng, Shuo Yen
N1 - Funding Information:
Manuscript received October 14, 2011; revised November 9, 2011; accepted November 10, 2011. Date of publication November 18, 2011; date of current version December 6, 2011. This work was supported in part by the National Science Council of Taiwan under Contract NSC 100-2221-E-006-176-MY3 and Contract NSC 100-2622-E-006-013-CC2. Corresponding author: S.-Y. Tseng (e-mail: [email protected]).
PY - 2011
Y1 - 2011
N2 - Mode conversion can be achieved in multimode waveguides using optical analogy of stimulated Raman adiabatic passage. The coupled mode equations (CMEs) for adiabatic mode conversion via an intermediate mode with wavelength detunings are derived for an engineered step-index multimode waveguide. It is shown that the detunings cause diabatic coupling of adiabatic modes and result in lowered conversion efficiency. The Landau-Zener (LZ) model of nonadiabatic crossing is used to analyze the spectral response of the mode converters and shown to be in good agreement with numerical solutions of the CMEs and beam propagation simulations. The analytical expressions from the LZ analysis offer useful insight into the spectral properties of the mode converters and suggest bandwidth tunability of these devices. We demonstrate bandwidth tunability of the mode converter by a numerical example.
AB - Mode conversion can be achieved in multimode waveguides using optical analogy of stimulated Raman adiabatic passage. The coupled mode equations (CMEs) for adiabatic mode conversion via an intermediate mode with wavelength detunings are derived for an engineered step-index multimode waveguide. It is shown that the detunings cause diabatic coupling of adiabatic modes and result in lowered conversion efficiency. The Landau-Zener (LZ) model of nonadiabatic crossing is used to analyze the spectral response of the mode converters and shown to be in good agreement with numerical solutions of the CMEs and beam propagation simulations. The analytical expressions from the LZ analysis offer useful insight into the spectral properties of the mode converters and suggest bandwidth tunability of these devices. We demonstrate bandwidth tunability of the mode converter by a numerical example.
UR - http://www.scopus.com/inward/record.url?scp=83455258081&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=83455258081&partnerID=8YFLogxK
U2 - 10.1109/JPHOT.2011.2176479
DO - 10.1109/JPHOT.2011.2176479
M3 - Article
AN - SCOPUS:83455258081
SN - 1943-0655
VL - 3
SP - 1198
EP - 1205
JO - IEEE Photonics Journal
JF - IEEE Photonics Journal
IS - 6
M1 - 6084807
ER -