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Super-Homogeneous Saturation of Microwave-Photonic Gain in Optoelectronic Oscillator Systems

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4 Author(s)
Loh, W. ; Lincoln Lab., Massachusetts Inst. of Technol., Lexington, MA, USA ; Yegnanarayanan, S. ; Ram, R.J. ; Juodawlkis, P.W.

We show that the saturation characteristic of microwave-photonic gain is “super-homogeneous” such that the gain of a weaker tone saturates more rapidly than that of a stronger tone when both signals are transmitted over an intensity-modulated optical link. Using this gain model, we simulate the effect of nonlinear gain saturation on the performance of a slab-coupled optical waveguide (SCOW)-based optoelectronic oscillator (OEO). We verify our simulations with experimental measurements and show that low sidemode levels (<; -110 dBc) can be achieved even when multiple modes can oscillate within the passband of the OEO loop filter.

Published in:

Photonics Journal, IEEE  (Volume:4 ,  Issue: 5 )

Date of Publication:

Oct. 2012

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