In this letter, we investigate the yield of 10-Gb/s electroabsorption modulator integrated-distributed feedback (EAMI-DFB) lasers for 40- and 60-km transmissions due to the chirp. The yield has been estimated from the effective positive chirp (EPC) capable to transmit signals over 40 and 60 km within 2-dB dispersion power penalty. The signals with EPC of 0.48 and 0.24 Å can be transmitted over 40 and 60 km with less than 2-dB power penalty, respectively. The chirp is calculated from a large signal dynamic model of EAMI-DFB lasers using the time-dependent transfer matrix method (TMM). The results suggest that the yield is mostly dependent on coupling constant (κL) and should be set around 1.3 for high yield while maintaining low facet reflectivity at modulator.
Bibliographical noteFunding Information:
Manuscript received September 14, 2001; revised December 19, 2001. This work was supported in part by Korea University and by the BK21 Program in Korea. The authors are with the Department of Radio Engineering, Korea University, 136-701 Seoul, Korea. Publisher Item Identifier S 1041-1135(02)01865-7.
- Chirp modulation
- Distributed-feedback lasers
- Optical feedback
- Yield estimation
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Atomic and Molecular Physics, and Optics
- Electrical and Electronic Engineering