title: Sidemode suppression for coupled optoelectronic oscillator by optical pulse power feedforward.
abstract: Multiple sidemodes have been observed in a coupled optoelectronic oscillator (COEO) when the contained actively mode-locked fiber ring laser employs erbium-doped fiber (EDF). We propose that such sidemodes can be suppressed significantly by an optical pulse power feedforward scheme, through which the mode-locked optical pulse is reversely intensity-modulated by itself, resulting in a fast power limiting. Experimentally we show that sidemodes are suppressed as much as 40 dB in a 10-GHz COEO. The additional noise induced by the power feedforward technique is analyzed numerically. We show that for a COEO with a typical cavity length, the feedforward contribution to final single-side band (SSB) noise is minor and neglectable.
authors.forename: Yitang
authors.initials: Y
authors.lastname: Dai
authors.forename: Ruixin
authors.initials: R
authors.lastname: Wang
authors.forename: Feifei
authors.initials: F
authors.lastname: Yin
authors.forename: Jian
authors.initials: J
authors.lastname: Dai
authors.forename: Lan
authors.initials: L
authors.lastname: Yu
authors.forename: Jianqiang
authors.initials: J
authors.lastname: Li
authors.forename: Kun
authors.initials: K
authors.lastname: Xu