Extended Data Fig. 3: A detailed illustration of the experimental setup.
From: Non-Abelian lattice gauge fields in photonic synthetic frequency dimensions
Electronic connections are shown in black thin lines, single-mode fibres in blue lines, polarization-maintaining fibres in purple lines, and free-space collimated beams in orange thick lines. The free-space section is highlighted in the orange box. PC, polarization controller; PSG, polarization state generator; C1–C3, fibre–free-space collimators; BS, beam splitter; FC, fibre coupler; PBS/C, polarizing beam splitter/combiner; EOM, electro-optic modulator; EDFA, erbium-doped fibre amplifier; FPGA, field-programmable gate array; RF amp., radiofrequency amplifier; PD, photodetector.
