Metro network utilizing 10 Gb/s directly modulated lasers and negative dispersion fiber

Analysis of linewidth and extinction ratio in directly modulated lasers for performance optimization in 10Gbit/s CWDM systems

“…4, it is possible to state that an increment in ER does not suppose always an improvement in the transmission quality. In fact, in the systems with DML-T1 lasers (α = 1) there is a specific value of power (5 mW in this simulation case) that determines the point in which the penalty for small ER begins to overcome the penalty for chirp [16]. That is, for an output power from 0 to 5 mW (approximately) an increment in ER increases the receiver sensitivity and a better performance is obtained.…”

Influence of laser chirp and parasitics on optimized dispersion-managed directly modulated systems operating at 10 Gbit·s^-1

“…The use of directly modulated lasers (DML), as transmitter sources, in high-sped multi-span systems is attracting a rapidly growing interest due to their ease of use, low cost, small-size, low driving voltage and high optical power capability, when compared with other transmitters, namely using external modulators [1,2]. Nevertheless, the modulation of the DML current causes carrier density modulation, giving rise to frequency chirp [3, p. 171].…”

Improved model to discriminate adiabatic and transient chirps in directly modulated semiconductor lasers

“…Nevertheless, the modulation of the DML current causes carrier density modulation, giving rise to frequency chirp (see [6], p. 171). The interaction of laser chirp with group velocity dispersion (GVD) and self-phase modulation (SPM) can significantly limit the transmission distance achievable in very high-speed transmission systems using DMLs [1][2][3][4][5].…”

“…The use of directly modulated lasers (DMLs), as transmitter sources, in very high-speed systems is attracting a growing interest due to their ease of use, low cost, small size and high optical power capability, when compared with other transmitters, namely using external modulators [1][2][3][4][5]. Nevertheless, the modulation of the DML current causes carrier density modulation, giving rise to frequency chirp (see [6], p. 171).…”