Propagation of transverse photonic orbital angular momentum through few-mode fiber

Qian Cao; Zhuo Chen; Chong Zhang; Andy Chong; Qiwen Zhan

doi:10.1117/1.AP.5.3.036002

Journals >Advanced Photonics >Volume 5 >Issue 3 >Page 036002 > Article

Advanced Photonics
Vol. 5, Issue 3, 036002 (2023)

Propagation of transverse photonic orbital angular momentum through few-mode fiber | On the Cover , Author Presentation

Qian Cao^1、2、3, Zhuo Chen¹, Chong Zhang¹, Andy Chong⁴, and Qiwen Zhan^{1、2、3、*}

Author Affiliations

¹University of Shanghai for Science and Technology, School of Optical-Electrical and Computer Engineering, Shanghai, China

²Zhangjiang Laboratory, Shanghai, China

³University of Shanghai for Science and Technology, Shanghai Key Laboratory of Modern Optical System, Shanghai, China

⁴Pusan National University, Department of Physics, Busan, Republic of Korea

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DOI: 10.1117/1.AP.5.3.036002 Cite this Article Set citation alerts

Qian Cao, Zhuo Chen, Chong Zhang, Andy Chong, Qiwen Zhan, "Propagation of transverse photonic orbital angular momentum through few-mode fiber," Adv. Photon. 5, 036002 (2023) Copy Citation Text

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Fig. 1. Modal decomposition of STOV pulse and focused STOV pulse in LP modes. (a) Spatiotemporal intensity and phase profile of a STOV pulse (

l = + 1

); (b) spatial intensity profile of

{LP}_{01}

and

{LP}_{11}

modes in SMF-28; (c) STOV pulse (

l = + 1

) synthesized by LP modes; (d) complex coefficient for LP modes for synthesizing a STOV pulse. (e) spatiotemporal intensity and phase profile of a focused STOV pulse (

l = + 1

); (f) focused STOV pulse (

l = + 1

) synthesized by LP modes; (g) complex coefficient for LP modes for synthesizing a focused STOV pulse.

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Numerical propagation of focused STOV pulse in few-mode fiber. (a) Unchirped focused STOV pulse; (b) unchirped focused STOV pulse with GVM between LP modes set at zero; (c) unchirped focused STOV pulse with GVD of each LP mode set at zero; (d) chirped focused STOV pulse.

Fig. 2. Numerical propagation of focused STOV pulse in few-mode fiber. (a) Unchirped focused STOV pulse; (b) unchirped focused STOV pulse with GVM between LP modes set at zero; (c) unchirped focused STOV pulse with GVD of each LP mode set at zero; (d) chirped focused STOV pulse.

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Fig. 3. Schematic for transmitting and measuring STOV pulse through few-mode optical fiber. The system is pumped by a home-built Yb:fiber laser system. One replica of the laser output is spatiotemporally modulated to a STOV pulse. It is then coupled into a few-mode fiber (SMF-28) by a high-NA aspherical lens mounted on a 3D translation stage. Another replica of the laser output is compressed and delay-controlled to serve as a probe pulse to measure the transmitted STOV pulse.

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Fig. 4. 3D measurement results for positively chirped STOV pulse transmitted by few-mode optical fiber. (a) Topological charge

l = + 1

and (b) topological charge

l = - 1

. The STOV pulse has an initial GDD of

36,000 {fs}^{2}

before fiber transmission.

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Parameter	Brief Description	Mode	Value	Unit
$n_{eff}$	Effective refractive index, $n_{eff} = β / k_{0}$	${LP}_{01}$	1.446191
${LP}_{11}$	1.443798
$n_{g}$	Effective group index, $n_{g} = c / v_{g}$ , $v_{g} = (β_{1})^{- 1} = {(\partial β / \partial ω)}^{- 1}$	${LP}_{01}$	1.463457
${LP}_{11}$	1.463508
$β_{2}$	GVD coefficient, $β_{2} = \partial^{2} β / \partial ω^{2}$	${LP}_{01}$	18.99	${fs}^{2} / mm$
${LP}_{11}$	28.61
$Δ T$	Group delay difference between ${LP}_{01}$ and ${LP}_{11}$		−170	fs/m

Table 1. Propagation parameters for LP01 and LP11 modes of SMF-28.

Qian Cao, Zhuo Chen, Chong Zhang, Andy Chong, Qiwen Zhan, "Propagation of transverse photonic orbital angular momentum through few-mode fiber," Adv. Photon. 5, 036002 (2023)

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