Journal: Light, Science & Applications
Article Title: Laser-written reconfigurable photonic integrated circuit directly coupled to a single-photon avalanche diode array
doi: 10.1038/s41377-025-01854-6
Figure Lengend Snippet: The laser beam is coupled into a single-mode fiber (SMF), after which it is attenuated by a variable optical attenuator (VOA) and, then, by means of a fiber splitter (FS), the beam is divided into two paths. The first one goes directly to a power meter (PM) for reference, while the second one is attenuated by a fiber attenuator (FA) and then divided again into two paths so that light can enter the PIC on two input waveguides simultaneously. Finally, the PIC is either calibrated through a second PM or coupled to the SPAD array
Article Snippet: The experimental setup, represented schematically in Fig. , was adapted from ref. . A free-space 561 nm laser beam was fiber-coupled to an electronic variable optical attenuator (VOA, Thorlabs V450A), then the beam was split into two paths through a 3 dB fiber splitter (FS).
Techniques: