Title :
Extended Transmission Reach Using Optical Filtering of Frequency-Modulated Widely Tunable SSG-DBR Laser
Author :
Matsuo, S. ; Kakitsuka, T. ; Segawa, T. ; Fujiwara, N. ; Shibata, Y. ; Oohashi, H. ; Yasaka, H. ; Suzuki, H.
Author_Institution :
NTT Corp., Atsugi
Abstract :
We propose a novel transmitter consisting of a frequency-modulated widely tunable super-structure-grating distributed Bragg reflector (SSG-DBR) laser and an optical filter. The SSG-DBR laser acts as a frequency modulating light source with a constant output power by modulating the reverse bias voltage in the phase control (PC) region. By optically filtering the output light from the frequency-modulated laser, we have demonstrated 60- and 180-km transmissions for 20- and 10-Gb/s nonreturn-to-zero (NRZ) signals, respectively. The power penalty was 2.2 dB after the 180-km transmission of a 10-Gb/s NRZ signal as determined by bit-error-rate measurements. Furthermore, an extended transmission reach was achieved with a wide tuning range without controlling the bias and modulating voltages in the PC region.
Keywords :
distributed Bragg reflector lasers; error statistics; laser cavity resonators; laser tuning; optical fibre communication; optical filters; optical transmitters; semiconductor lasers; bit rate 10 Gbit/s; bit rate 20 Gbit/s; bit-error-rate measurements; distance 180 km; distance 60 km; frequency modulating light source; frequency-modulated widely tunable superstructure-grating distributed Bragg reflector laser; nonreturn-to-zero signals; optical filter; phase control region; power penalty; reverse bias voltage; transmitter; tuning range; Filtering; Frequency; Laser tuning; Optical filters; Optical modulation; Optical signal processing; Optical transmitters; Optical variables control; Phase modulation; Tunable circuits and devices; Directly modulated laser; frequency- modulated laser; optical filter; optical minimum-shift keying (OMSK); super-structure grating (SSG); widely tunable laser;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2007.915634
