Abstract
A scheme for parametric optical frequency comb (OFC) generation using an electroabsorption modulated laser (EML) based optoelectronic oscillator is proposed and experimentally demonstrated. A phase modulator is cascaded with EML in the oscillating loop. In addition, the phase modulated laser is used as pump seeds for the parametric frequency mixer. In the mixer, a 100-m single-mode fiber is employed to compress the pump pulses, and the parametric process is stimulated in a 200-m-high nonlinear fiber (HNLF) with flat normal dispersion. In our experiments, a 10-GHz radio frequency signal with a side-mode suppression radio of 47 dB and a single-sideband phase noise of −109.89 dBc/Hz at 10 kHz offset is obtained. When the pump power injected into HNLF is 28 dBm, a 10-tone parametric OFC with a 5-dB power variation and spacing equal to the oscillation frequency is generated.
Highlights
Optical frequency combs (OFCs) with high coherence, great flatness and stability are attractive for diverse applications such as time and frequency metrology [1], arbitrary waveform synthesis [2], wavelength division multiplex (WDM) communication [3] and so on [4]
The generated electrical signal is amplified with EA1 and bandpass filtered by a BPF centered at 10 GHz with a 3-dB bandwidth of 150 MHz
The pump seeds for parametric frequency mixing is produced by cascading a phase modulators (PMs) with the electroabsorption modulated laser (EML) in the optoelectronic oscillator (OEO) loop
Summary
Optical frequency combs (OFCs) with high coherence, great flatness and stability are attractive for diverse applications such as time and frequency metrology [1], arbitrary waveform synthesis [2], wavelength division multiplex (WDM) communication [3] and so on [4]. The phase noise performance of the comb lines generated by using electro-optical modulators (EOMs) may be poor, especially when a high frequency RF signal used. A monolithic OFC generator consisting of a PM and a Fabry-Perot (FP) resonator has been employed to replace the conventional EOMs in the OEO loop [14] For these schemes, a CW laser is used to provide carriers for the modulator, and a larger coupling loss between the two components is usually introduced. In our work, we replace a CW laser and an MZM or an EAM in an OEO loop with an electroabsorption modulated laser (EML) to design a self-starting parametric OFC generator In this generator, a PM cascaded with the EML is embedded in the oscillation loop to produce chirped pulses. Our scheme has the advantages of large bandwidth and low power consumption
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