In-line and cascaded DWDM transmission using a 15dB net-gain polarization-insensitive fiber optical parametric amplifier

Abstract

We demonstrate and characterize polarization-division multiplexed (PDM) DWDM data transmission for the first time in a range of systems incorporating a net-gain polarization-insensitive fiber optical parametric amplifier (PI-FOPA) for loss compensation. The PI-FOPA comprises a modified diversity-loop architecture to achieve 15dB net-gain, and up to 2.3THz (~18nm) bandwidth. Three representative systems are characterized using a 100Gb/s PDM-QPSK signal in conjunction with emulated DWDM neighbouring channels: (a) a 4x75km in-line fiber transmission system incorporating multiple EDFAs and a single PI-FOPA (b) N cascaded PI-FOPA amplification stages in an unlevelled Nx25km recirculating loop arrangement, with no EDFAs used within the loop signal path, and (c) M cascaded PI-FOPA amplification stages as part of an Mx75.6km gain-flattened recirculating loop system with the FOPA compensating for the transmission fiber loss, and EDFA compensation for loop switching and levelling loss. For the 4x75km in-line system (a), we transmit 45x50GHz-spaced signals ('equivalent' data-rate of 4.5Tb/s) with average OSNR penalty of 1.3dB over the band at 10 BER. For the unlevelled 'FOPA-only' 25.2km cascaded system (b), we report a maximum of eight recirculations for all 10x100GHz-spaced signals, and five recirculations for 20x50GHz-spaced signals. For the 75.6km levelled system

Experimental comparison of fiber optic parametric, Raman and erbium amplifiers for burst traffic for extended reach PONs

“…The HNLFs insertion loss were 1.4 dB and 0.9 dB, and lengths were 250 m and 200 m respectively. A seed for pumps was sourced from a 100 kHz linewidth laser and phase modulated with three tones at 100, 320 and 980 MHz to mitigate stimulated Brillouin scattering (SBS) [8] . Then, the seed was split by a 3 dB coupler into two waves amplified by two high-power EDFAs to produce two pumps.…”

“…Fiber optic parametric amplifiers (FOPA) have been shown to be a promising amplification technology for fiber optical communication with such unique features as a very large gain (70 dB) [1,2] a broad (>100 nm) and flat gain spectrum [3][4][5], and phase sensitive gain allowing for <3 dB noise figure [6]. FOPA has recently became available for in-line amplification with introduction of novel polarization-insensitive FOPA architectures [7][8][9]. FOPA reliance on Kerr effect allows for practically instantaneous response time of ∼0.1 fs thus avoiding penalties on amplification of traffic bursts [10].…”

Noise Figure Evaluation of Polarization-insensitive Single-pump Fiber Optical Parametric Amplifiers

“…Recent advances in polarization-insensitive FOPA [4] have enabled amplification of polarization multiplexed signals [5] and multi-span transmission experiments [6]. These experiments have utilized half-pass loop (HPL) architecture.…”

Raman-Generated Pump and Its Use for Parametric Amplification and Phase Conjugation

“…However, practically realisable FOPAs typically require an EDFA to generate a parametric pump (PP) of sufficient power ( 1W) and quality, having narrow linewidth and low noise. Significant FOPA research progress 4 has therefore been restricted to the EDFA band and around it. A number of methods have previously been reported to avoid this EDFA restriction such as the use of: highpower wavelength conversion; semiconductor optical amplification; and Ytterbium doped fibre amplification.…”