Abstract
In this paper, a new technique for generation of ultra-wide and flattened optical frequency comb (OFC) based on serial cascading of a phase modulator and dual-driven Lithium-Niobate Mach Zehnder modulator (DD-LiNbO3-MZM) is proposed. Over 60 carriers were generated by carefully adjusting the RF switching voltage (RFSV) of the DD-LiNbO3-MZM and the signal frequency of the sinusoidal wave (RF) source. A low power amplified RF source with a signal driving power of 16.9dBm is applied, and the power of CW laser is kept at 3dBm. The frequency spacing (FS) is kept at 20GHz for generating the maximum number of carriers. Nonetheless, the scheme is also tested for the FSs of 64GHz, and 32GHz. Each scenario is examined in simulation environment and the main outcomes are highlighted. The proposed scheme is comparatively simple and the FS varies with the applied RF source on the modulators. The achieved OFC lines have a tone-to-noise ratio (TNR) of over 45dB with an undesired side mode suppression ratio of approximately 20dB. The comb lines are almost flat with a varying power deviation of around 0dB-6dB which is optimized to nearly 0.12dB. Furthermore, the impact of the RFSV on the generated number of carriers is studied in detail. The scheme is analyzed in terms of cost efficiency, power deviations, TNR, optical signal to noise ratio, and number of achieved comb lines.
Highlights
Optical frequency comb (OFC) generation have attracted many researchers due to its diverse characteristics of transmitting higher data rates at lower cost
To reduce the power deviation (PD) and get an overall flattened OFC spectra, an optical filter is utilized to perform gain flattening and an optimized OFC is achieved where the PD is reduced to a maximum of ∼0.12dB
SIMULATION RESULTS AND DISCUSSIONS In order to confirm the likelihood and need of the proposed OFC generation scheme, theoretical and principle analysis were performed for the cascaded phase modulators (PMs) and DD-LiNbO3-MZM
Summary
Optical frequency comb (OFC) generation have attracted many researchers due to its diverse characteristics of transmitting higher data rates at lower cost. Serially cascaded optical phase modulator (PM) and dual-driven Lithium-Niobate Mach Zehnder modulator (DD-LiNbO3-MZM) is utilized for the generation of OFC. The optical input arm of the DD-LiNbO3-MZM is driven by the generated output of the PM and both electrical input arms of the DD-LiNbO3MZM are driven by the low powered RF source having same power and frequency.
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