Polarization-independent filtering in a grating-assisted horizontal directional coupler

François, Serge; Fouchet, S.; Bouadma, N.; Ougazzaden, A.; Carre, M.; Herve-Gruyer, G.; Filoche, Marcel; Carenco, A.

doi:10.1109/68.393204

Cited by 7 publications

(3 citation statements)

References 7 publications

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confidence: 99%

“…where Λ is the grating period, typically on the order of few tens of microns. Furthermore, the birefringence compensation technique originally proposed in [28] and experimentally demonstrated in [31,32] allows achieving polarization-independent operation. To this end, a condition of identical TE and TM birefringence should be met through appropriate guide design (material composition and geometry):…”

Section: Restoring Ep and Binary Switching Using Longperiod Grating-a...mentioning

confidence: 99%

“…Furthermore, this design not only ensures a robust recovery of the EP, but it is also perfectly suited for binary switching operation below EP as presented in [26,27]. In addition, it does not impair the use of a birefringence compensation technique for achieving polarization-independent operation [28].…”

Section: Introductionmentioning

confidence: 99%

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Restoring robust binary switching operation and exceptional point using long-period grating-assisted parity-time symmetric couplers

Perrière¹,

Gaimard²,

Bénisty³

et al. 2019

J. Phys. D: Appl. Phys.

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The impact of imbalance in waveguides propagation constants among Parity-Time symmetric coupled waveguides and/or of a complex-valued coupling coefficient is assessed. The narrow tolerance found implies that attempts to tightly control waveguides parameters appear as elusive because of fabrication technology limitations, calling for more feasible mitigation avenues. It is shown that a grating-assisted Parity-Time symmetric coupler design restores both technologically robust binary switching operation and exceptional point. In addition the proposed design is compatible with birefringence compensation techniques providing polarization-independent operation as well as coupling and/or gain-loss profile modulation techniques that extend the control of switching operation in the Parity-Time symmetric phase. Using wavelength as an additional tuning parameter near exceptional points opens promising avenues for manipulating the trajectory on Riemann sheets in topological photonics applications.

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Section: ! % *( )mentioning

confidence: 99%