Mid-infrared dual-comb generation via the cross-phase modulation effect in a normal-dispersion microcavity

Liujun Guo; Liujun Guo; Leiran Wang; Leiran Wang; Qibing Sun; Qibing Sun; Mulong Liu; Mulong Liu; Guoxi Wang; Weiqiang Wang; Peng Xie; Peng Xie; Weichen Fan; Weichen Fan; Wei Zhao; Wei Zhao

doi:10.1364/AO.385401

Applied Optics
Vol. 59,
Issue 7,
pp. 2101-2107
(2020)
•https://doi.org/10.1364/AO.385401

Mid-infrared dual-comb generation via the cross-phase modulation effect in a normal-dispersion microcavity

Liujun Guo, Leiran Wang, Qibing Sun, Mulong Liu, Guoxi Wang, Weiqiang Wang, Peng Xie, Weichen Fan, and Wei Zhao

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Liujun Guo, Leiran Wang, Qibing Sun, Mulong Liu, Guoxi Wang, Weiqiang Wang, Peng Xie, Weichen Fan, and Wei Zhao, "Mid-infrared dual-comb generation via the cross-phase modulation effect in a normal-dispersion microcavity," Appl. Opt. 59, 2101-2107 (2020)

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Abstract

We numerically demonstrate orthogonally polarized dual-comb generation in a single microcavity with normal dispersion assisted by the cross-phase modulation (XPM) effect. It is found that the XPM effect facilitates the emission of a secondary polarized comb with different temporal properties in a wide existence range covering the blue- to red-detuned regime and thus releases the requirements for delicate control on the detuned region of pump frequency. Also, the energy transfer between two polarization components together with the normal-dispersion property contributes to a more balanced intensity difference and significantly increased conversion efficiency from the pump light into the comb operation. This work could provide a route to a low-cost and compact mid-infrared dual-comb system with a lower power requirement as well as an effective approach to higher comb teeth power with improved efficiency for practical applications.

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	TE mode		TM mode
Waveguide area ( ${n m}^{2}$ )		$3130 \times 4000$
Cladding material		Air
Substrate material		Silicon oxide
$R / L$ (µm)		100/628
$λ_{0}$ $(µ m) / ω_{0}$ (THz)		3/62.78
$τ_{e f f}$ (ps)		10
$α_{0}$ (dB/cm)		0.07
$κ$		0.0083
$β_{3 P A}$ ( $m^{3} / W^{2}$ )		$2 \times 10^{- 26}$
$σ$ ( $m^{2}$ )		$4.08 \times 10^{- 21}$
$μ$		4.5
$n_{2}$ ( $m^{2} / W$ )		$6 \times 10^{- 18}$
$n_{0}$		3.42
$ρ$		0.892
$Q_{t o t a l}$	$4.947 \times 10^{5}$		$4.953 \times 10^{5}$
FSR $(G H z) / t_{R}$ (ps)	135.6/7.37		135.8/7.36
$n_{g}$	3.5143		3.5186
$v_{g}$ (m/s)	$85.31 \times 10^{6}$		$85.20 \times 10^{6}$
$β_{2}$ ( ${p s}^{2} / k m$ )	71.77		5.85
$A_{e f f}$ ( $µ m^{2}$ )	6.15		6.07
$γ$ ( $1 / (W * m)$ )	2.04		2.07

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Applied Optics