title: 270-km ultralong Raman fiber laser.
abstract: We analyze the physical mechanisms limiting optical fiber resonator length and report on the longest ever laser cavity, reaching 270 km, which shows a clearly resolvable mode structure with a width of approximately 120 Hz and peak separation of approximately 380 Hz in the radio-frequency spectrum.
authors.affiliation: Photonics Research Group, Aston University, Birmingham, B4 7ET, United Kingdom.
authors.forename: S K
authors.initials: SK
authors.lastname: Turitsyn
authors.forename: J D
authors.initials: JD
authors.lastname: Ania-Castañón
authors.forename: S A
authors.initials: SA
authors.lastname: Babin
authors.forename: V
authors.initials: V
authors.lastname: Karalekas
authors.forename: P
authors.initials: P
authors.lastname: Harper
authors.forename: D
authors.initials: D
authors.lastname: Churkin
authors.forename: S I
authors.initials: SI
authors.lastname: Kablukov
authors.forename: A E
authors.initials: AE
authors.lastname: El-Taher
authors.forename: E V
authors.initials: EV
authors.lastname: Podivilov
authors.forename: V K
authors.initials: VK
authors.lastname: Mezentsev