Details

Autor(en) / Beteiligte

• Do, Phuong T
• Alonso-Ramos, Carlos
• Le Roux, Xavier
• Ledoux, Isabelle
• Journet, Bernard
• Cassan, Eric

Titel

Wideband tunable microwave signal generation in a silicon-micro-ring-based optoelectronic oscillator

Ist Teil von

• Scientific reports, 2020-04, Vol.10 (1), p.6982-6982, Article 6982

Ort / Verlag

England: Nature Publishing Group

Erscheinungsjahr

2020

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Si photonics has an immense potential for the development of compact and low-loss opto-electronic oscillators (OEO), with applications in radar and wireless communications. However, current Si OEO have shown a limited performance. Si OEO relying on direct conversion of intensity modulated signals into the microwave domain yield a limited tunability. Wider tunability has been shown by indirect phase-modulation to intensity-modulation conversion. However, the reported tuning range is lower than 4 GHz. Here, we propose a new approach enabling Si OEOs with wide tunability and direct intensity-modulation to microwave conversion. The microwave signal is created by the beating between an optical source and single sideband modulation signal, selected by an add-drop ring resonator working as an optical bandpass filter. The tunability is achieved by changing the wavelength spacing between the optical source and a resonance peak of the resonator. Based on this concept, we experimentally demonstrate microwave signal generation between 6 GHz and 18 GHz, the widest range for a Si-micro-ring-based OEO. Moreover, preliminary results indicate that the proposed Si OEO provides precise refractive index monitoring, with a sensitivity of 94350 GHz/RIU and a potential limit of detection of only 10 RIU, opening a new route for the implementation of high-performance Si photonic sensors.