Photonics Research, 2019, 7 (7): 07000A36, Published Online: Jun. 17, 2019
Chip-based squeezing at a telecom wavelength 
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Fig. 1. Experimental setup. A fiber coupled CW telecom laser at 1560.44 nm is amplified (EDFA) and split into two by means of a 65:35 fiber beam splitter (f-BS). The less intense output (upper arm) serves as local oscillator (LO) while the brighter one (lower arm) is frequency doubled via SHG in a PPLN/RW and used to pump an on-chip squeezing generation stage (SPDC). The power of the beam at 780.22 nm is controlled with an in-line fibered attenuator (Pwr Ctrl) and its polarization is adjusted by means of a fiber polarization controller. At the output of the SPDC stage, squeezed light at 1560.44 nm is optically mixed with the LO beam inside the same chip in an integrated directional coupler realizing the interferometric part of the homodyne detector. At the chip output, after passing through a bulk lens followed by an optical filter suppressing residual pump at 780.22 nm, light is sent to two InGaAs photodiodes (PDs). The LO phase is scanned thanks to a home-made fiber-stretcher (ϕ LO
Fig. 2. Schematic of our photonic chip on lithium niobate. The chip includes an SPDC stage, consisting in a periodically poled waveguide (3 cm long with poling period Λ = 16.3 μm
F. Mondain, T. Lunghi, A. Zavatta, E. Gouzien, F. Doutre, M. De Micheli, S. Tanzilli, V. D’Auria. Chip-based squeezing at a telecom wavelength[J]. Photonics Research, 2019, 7(7): 07000A36.
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