2024-10-30 チャルマース工科大学
＜関連情報＞
- https://news.cision.com/chalmers/r/faster-space-communication-with-record-sensitive-receiver,c4058292
- https://opg.optica.org/optica/fulltext.cfm?uri=optica-11-11-1497&id=561957
従来の単波長伝送を用いた超低ノイズ前置増幅型光受信機 Ultralow-noise preamplified optical receiver using conventional single-wavelength transmission
Rasmus Larsson, Ruwan U. Weerasuriya, and Peter A. Andrekson
Optica Published: October 28, 2024
DOI:https://doi.org/10.1364/OPTICA.539544
Abstract
Conventional optical amplifiers that use stimulated emission suffer from the generation of excess noise, thus limiting the performance in many applications. The phase-sensitive optical parametric amplifier, relying on the use of a nonlinear material for amplification, is an exception that can approach a noise figure of 0 dB. Its implementation in optical communication links has, however, been cumbersome due to increased complexity both in the transmitter and the receiver, effectively limiting the use of such amplifiers in practice. Here, we propose and demonstrate an implementation of a transmission system with exceptional performance in terms of receiver sensitivity (0.9 photons per bit) using a standalone ultralow-noise phase-sensitively preamplified receiver and a conventional single-wave optical transmitter. This is a significant simplification compared to previous demonstrations and can transform such amplifiers from a curiosity to practical use for example in deep-space-to-earth communication links.
