100/spl deg/C, 10 Gb/s directly modulated InGaAsP DFB lasers for uncooled Ethernet applications

Abstract

FBG can improve the spectral efficiency of mmwave fiber-radio systems employing wavelength interleaving and optical single-sideband modulation. Our results demonstrate the effectiveness of the FBG in dropping the required carrier wavelength and sideband. In addition excellent isolation between the added and dropped channels was demonstrated when the FBG was employed in asystem incorporatingbathaddanddropconfigurations. We are now investigating the aptimilation of the grating in order to improve the rolloff of the transmission notches and minimize transmission amplitude ripples. References1. G. Smith, D. Novak and C. Lim,"A millimeter-wave full duplex fiber radio star-tree architecture incorporating WDM and SCM," IEEE Photon. Tech. Lett. vol. 10, pp. 1 6 5 6 1652 (1998). 2. H. Schmuck, "Comparison of optical miL limeter-wave system concepts with regard to chromaticdispersion:'Electron.

160-Gb/s CWDM Capacity Upgrade Using 2.5-Gb/s Rated Uncooled Directly Modulated Lasers

“…When speaking about uncooled lasers, it is imperative to demonstrate operation not only at 25 C, but also at elevated temperatures, where DML characteristics tend to degrade rapidly [6]. Fig.…”

10-Gb/s upgrade of bidirectional CWDM systems using electronic equalization and FEC

“…It is also worth mentioning at this point that we tested our lasers at elevated temperatures, where DML characteristics tend to rapidly degrade [5]. Case temperatures of more than 65 were well supported by all 16 DMLs [8].…”

“…Further increasing capacity without resorting to more complex dense WDM (DWDM) overlays [2] naturally asks for the migration to higher per-channel CWDM data rates. This has pushed the design and data modulation of uncooled DMLs to 10 Gb/s [3]- [5] and beyond [6], [7]. However, in addition to the difficulties of manufacturing low-cost yet high-speed laser sources, the high frequency-chirp inherent to DMLs poses significant problems in upgrading CWDM systems to 10-Gb/s line rates.…”