Electro‐optic SSB modulator with 90° hybrid directly prepared onto LiNbO 3  substrate | Zendy

Enokihara A. | Zendy; Kawamura K. | Zendy; Nakao T. | Zendy; Yamamoto K. | Zendy; Kawai T. | Zendy; Kawanishi T. | Zendy

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Electro‐optic SSB modulator with 90° hybrid directly prepared onto LiNbO 3 substrate

Author(s) -

Enokihara A.,

Kawamura K.,

Nakao T.,

Yamamoto K.,

Kawai T.,

Kawanishi T.

Publication year - 2013

Publication title -

electronics letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.375

H-Index - 146

ISSN - 1350-911X

DOI - 10.1049/el.2013.1533

Subject(s) - substrate (aquarium) , materials science , optoelectronics , optical modulator , electro optic modulator , modulation (music) , lithium niobate , optics , electronic engineering , phase modulation , physics , engineering , acoustics , oceanography , phase noise , geology

Optical single‐sideband (SSB) modulation is theoretically realised by applying two modulation signals with a 90° phase difference to the dual‐electrode type electro‐optic (EO) modulator. A branch‐line coupler (BC) as the microwave 90° hybrid was directly prepared on the EO modulator substrate, LiNbO 3 , to create two modulation signals from a single input signal. Output ports of the BC were connected to the modulation electrodes on the substrate. Thereby, an EO optical SSB modulator was realised with a single‐tip and a small‐sized configuration. The SSB modulator was designed and fabricated for around 10 GHz modulation frequency and 1550 nm light wavelength. The optical SSB modulation operation with a sideband suppression ratio of more than 20 dB was confirmed by the experiment.

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