title: Quadrature demultiplexing using a degenerate vector parametric amplifier.
abstract: We report on quadrature demultiplexing of a quadrature phase-shift keying (QPSK) signal into two cross-polarized binary phase-shift keying (BPSK) signals with negligible penalty at bit-error rate (BER) equal to 10(-9). The all-optical quadrature demultiplexing is achieved using a degenerate vector parametric amplifier operating in phase-insensitive mode. We also propose and demonstrate the use of a novel and simple phase-locked loop (PLL) scheme based on detecting the envelope of one of the signals after demultiplexing in order to achieve stable quadrature decomposition.
authors.forename: Abel
authors.initials: A
authors.lastname: Lorences-Riesgo
authors.forename: Lan
authors.initials: L
authors.lastname: Liu
authors.forename: Samuel L I
authors.initials: SL
authors.lastname: Olsson
authors.forename: Rohit
authors.initials: R
authors.lastname: Malik
authors.forename: Aleš
authors.initials: A
authors.lastname: Kumpera
authors.forename: Carl
authors.initials: C
authors.lastname: Lundström
authors.forename: Stojan
authors.initials: S
authors.lastname: Radic
authors.forename: Magnus
authors.initials: M
authors.lastname: Karlsson
authors.forename: Peter A
authors.initials: PA
authors.lastname: Andrekson
mesh_terms: D000669:Amplifiers, Electronic; D000703:Analog-Digital Conversion; D055100:Optical Fibers; D011846:Radio Waves; D012815:Signal Processing, Computer-Assisted