title: 40Gbit/s coherent optical receiver using a Costas loop.
abstract: A highly integrated 40 Gbit/s coherent optical receiver is reported using a Costas loop as a homodyne optical phase locked loop (OPLL). A photonic IC, an electrical IC, and a hybrid loop filter are characterized, and the feedback loop system is fully analyzed to build a stable homodyne OPLL. All components are integrated on a single substrate within the compact size of 10 × 10mm(2), and a 1.1 GHz loop bandwidth and a 120 psloop delay are achieved. The binary phase-shift keying receiver exhibits error-free (BER<10(-12)) up to 35 Gbit/s and BER<10(-7) for 40 Gbit/s with no latency, and consumes less than 3 W power.
authors.affiliation: ECE Department, University of California at Santa Barbara, Santa Barbara, CA 93106-9560, USA. hcpark@ece.ucsb.edu
authors.forename: Hyun-chul
authors.initials: HC
authors.lastname: Park
authors.forename: Mingzhi
authors.initials: M
authors.lastname: Lu
authors.forename: Eli
authors.initials: E
authors.lastname: Bloch
authors.forename: Thomas
authors.initials: T
authors.lastname: Reed
authors.forename: Zach
authors.initials: Z
authors.lastname: Griffith
authors.forename: Leif
authors.initials: L
authors.lastname: Johansson
authors.forename: Larry
authors.initials: L
authors.lastname: Coldren
authors.forename: Mark
authors.initials: M
authors.lastname: Rodwell