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Figure 1

From: The Brillouin gain of vector modes in a few-mode fiber

Figure 1

Experimental setup for the Brillouin gain spectra measurement of vector modes. (PC: polarization controller; LPFG: long period fiber grating; LO: local oscillator; FMF: few-mode fiber; POL: linear polariser; PD: photodetector; ESA: Electrical spectrum analyzer; EDFA: Erbium doped fiber amplifier; OC: optical circulator). Inset: Electric field representation (arrows) of the TM01, TE01, HE21a and HE21b (LP11 mode group) calculated using FEM19.

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