High-speed traveling-wave directional coupler switch/modulator for λ = 1.32 µm

Author

Alferness, R.C. ; Joyner, C.H. ; Buhl, L.L. ; Korotky, S.K.

Author_Institution

Bell Labs., Holmdel, NJ, USA

Volume

19

Issue

9

fYear

1983

fDate

9/1/1983 12:00:00 AM

Firstpage

1339

Lastpage

1341

Abstract

We have designed and fabricated a Ti:LiNbO3waveguide traveling-wave directional coupler switch/modulator operating at $\\lambda = 1.32 \\mu$ m that exhibits a 3 dB modulation bandwidth of 7.2 GHz, a switching voltage of 4.5 V, and power per unit bandwidth of 7.6 mw/ GHz. Using short drive pulses, optical pulsewidths as short as 58 ps have been generated and directly measured with a high-speed InGaAs/InP p-i-n photodiode. Thick ( $\\sim 2.8 \\mu$ m) electroplated gold has been used to produce a small gap (5 μm) and low-loss coplanar strip electrode. The 1.5 cm long, 15 μm wide electrode has a dc resistance of 7 Ω and a total microwave power loss of ∼4dB at 5 GHz.

Keywords

Infrared modulation/demodulation; Lithium materials/devices; Optical directional couplers; Optical switches; Time-division multiplexing; Traveling-wave devices; Bandwidth; Directional couplers; Electrodes; High speed optical techniques; Optical modulation; Optical pulse generation; Optical switches; Optical waveguides; Pulse measurements; Voltage;

fLanguage

English

Journal_Title

Quantum Electronics, IEEE Journal of

Publisher

ieee

ISSN

0018-9197

Type

jour

DOI

10.1109/JQE.1983.1072056

Filename

1072056