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A Y-fed directional coupler modulator with a highly linear transfer curve

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3 Author(s)
Kishino, T. ; Florida Univ., Gainesville, FL, USA ; Tavlykaev, R.F. ; Ramaswamy, R.V.

We demonstrated a linearized Y-fed directional coupler modulator in Z-cut LiNbO/sub 3/. The proof-of-concept device employed two electrode sections of opposite polarity whose lengths were chosen based on the results of our previous theoretical modeling. A highly linear modulation characteristic and improved tolerance to fabrication errors were achieved with a simple design, in excellent agreement with the theory. The linearity exceeded 90% over a wavelength range of 45 nm, centered around 1530 nm, with a maximum linearity of 97% at 1510 nm and a maximum modulation depth of 98%. By comparison, the linearity of conventional modulators is typically around 70%. Thus the device was proven to have a high linearity with a wide usable spectral range and relaxed fabrication tolerances.

Published in:

Photonics Technology Letters, IEEE  (Volume:12 ,  Issue: 11 )

Date of Publication:

Nov. 2000

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