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Guided-Wave EO Intensity Modulator Using Coupled Microstrip Line Electrode of Higher-Order Harmonic Resonance Combined with Polarization-Reversed Structure
Akira ENOKIHARA Hiroyoshi YAJIMA Hiroshi MURATA Yasuyuki OKAMURA
Publication
IEICE TRANSACTIONS on Electronics
Vol.E90-C
No.5
pp.1096-1104 Publication Date: 2007/05/01 Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.5.1096 Print ISSN: 0916-8516 Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Integrated Photonic Devices) Category: LiNbO3 Devices Keyword: EO modulator, resonant electrode, higher order harmonic resonance, polarization reversed structure, transit-time effect, LiTaO3,
Full Text: PDF(729.7KB)>>
Summary:
A novel structure of a resonator type guided-wave electro-optic intensity modulator is introduced that uses a higher-order harmonic resonant electrode of coupled microstrip lines combined with polarization-reversed structure. The light modulation cancellation caused by the light transit-time effect in the resonant electrode, which is longer than the wavelength of the standing wave, is compensated for to enhance modulation efficiency. The modulator for 26 GHz operation was designed and fabricated with a LiTaO3 substrate. The modulation electrode is 9.03 mm long for seventh order harmonic resonance by RF signal. The workability of the modulator was confirmed by experiments with 1.3 µm wavelength light.
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