Title :
Isolator-free 2.5-Gb/s 80-km transmission by directly modulated /spl lambda//8 phase-shifted DFB-LDs under negative feedback effect of mirror loss
Author :
Yidong Huang ; Okuda, T. ; Sato, K. ; Muroya, Y. ; Sasaki, T. ; Kobayashi, K.
Author_Institution :
Syst. Devices & Fundamental Res., NEC Corp., Shiga, Japan
fDate :
3/1/2001 12:00:00 AM
Abstract :
It was verified for the first time that phase-shift value in directly modulated DFB laser diodes (LDs) affects their chirping characteristics and external optical feedback resistance due to the feedback effect of mirror loss (FEML). Theoretical and experimental results clarified that the negative FEML achieved in /spl lambda//8 phase-shifted DFB-LDs was able to improve the transmission performances and make the LDs more robust to external optical feedback. Isolator-free 80-km transmissions with a very low power penalty of less than 1-dB at bit error rate (BER)=10/sup -10/ was demonstrated with 2.5-Gb/s directly modulated 1.55-μm /spl lambda//8 phase-shifted DFB-LDs.
Keywords :
Internet; chirp modulation; data communication; distributed feedback lasers; laser feedback; laser mirrors; optical losses; optical transmitters; semiconductor lasers; 1.55 mum; 1.55-/spl mu/m /spl lambda//8 phase-shifted DFB-LDs; 2.5 Gbit/s; 80 km; DFB laser diodes; chirping characteristics; directly modulated /spl lambda//8 phase-shifted DFB-LDs; external optical feedback; external optical feedback resistance; feedback effect; isolator-free transmission; mirror loss; negative feedback effect; phase-shift value; transmission performances; very low power penalty; Chirp modulation; Mirrors; Negative feedback; Optical feedback; Optical fiber networks; Optical losses; Optical modulation; Optical refraction; Phase modulation; Robustness;
Journal_Title :
Photonics Technology Letters, IEEE
