Hybrid electro-optic polymer/sol-gel waveguide directional coupler switches

Enami, Y.; Mathine, D.; DeRose, C. T.; Norwood, R. A.; Luo, J.; Jen, A. K-Y.; Peyghambarian, N.
May 2009
Applied Physics Letters;5/25/2009, Vol. 94 Issue 21, p213513
Academic Journal
We report electro-optic (EO) switches using transversely tapered hybrid EO/sol-gel waveguide directional couplers. The length of the active region critically reduces to 1.5 mm with transverse tapers, which is shorter by a factor of 5 than the active region with vertical tapers. The transitions are performed from a sol-gel core to two EO polymer cores with gradual index changes using gray-scaled photobleaching. The device shows the lowest switching voltage and an active length product (VsLa) of 2.9 V cm with a guest–host EO polymer AJLS102, compared to hybrid waveguide switches and modulators with vertical taper and higher EO coefficients.


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