title: On the long-memory filtering gain in optical high-order QAM transmission systems.
abstract: In this paper, we verify the effectiveness of the last-stage long memory filter (LMF) in mitigating the long-memory response (LMR) of hardware, i.e. the transmitter and receiver. Based on the experimental results, we draw the following conclusions: 1) LMF can effectively mitigate the LMR impact, such as transmitter reflections, and its efficiency is more significant for high-order QAM signals. 2) Using LMF, a partially-correlated pattern exhibits similar performance to that of an uncorrelated pattern both in back-to-back and after 320-km standard single mode fiber (SSMF) transmission. Moreover, a simple solution to the computational complexity of LMF, effective-tap (ET) LMF, is proposed and demonstrated.
authors.affiliation: KDDI R&D Laboratories Inc, 2-1-15 Ohara, Fujimino, Saitama 356-8502, Japan. pe-weiren@kddilabs.jp
authors.forename: Wei-Ren
authors.initials: WR
authors.lastname: Peng
authors.forename: Hidenori
authors.initials: H
authors.lastname: Takahashi
authors.forename: Takehiro
authors.initials: T
authors.lastname: Tsuritani
authors.forename: Itsuro
authors.initials: I
authors.lastname: Morita
mesh_terms: D000669:Amplifiers, Electronic; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005374:Filtration / Q000295:instrumentation*; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D013685:Telecommunications / Q000295:instrumentation*