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Proceedings Paper

Simulation and grating design of DFB-LDs for metropolitan area and access networks and their characteristics
Author(s): Tetsuro Okuda; Yidong Huang; Kenji Sato; Yoshiharu Muroya
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Paper Abstract

This paper describes grating design of distributed feedback laser diodes (DFB-LDs) for use in metropolitan area and access networks and demonstrates improved performance of DFB-LDs with new gratin structures. Dynamic behaviors of DFB-LDs under the external optical feedback were analyzed for conventional uniform grating DFB-LDs and partially corrugated waveguide laser diodes (PC-LDs). A high-resistant characteristic against external optical feedback was achieved by PC-LD with optimized grating structure. The increase of RIN was suppressed to as low as -126 dB/Hz with the external optical feedback of -20 dB. It was also found that feedback effect of mirror loss (FEML) plays an important role in external optical feedback resistance. Furthermore, negative FEML, which suppresses relaxation oscillation, reduces transient chirp under high-bit-rate modulation. FEML is successfully controlled by adjusting phase shift value in phase-shifted DFB-LDs, and very low power penalty transmission was demonstrated by (lambda) /8 phase-shifted DFB-LDs. After 100-km transmissions, a power penalty of less than 1 dB within a wide extinction ratio region form 8.5 to 14.5 dB was demonstrated with 2.5 Gb/s direct modulation. These DFB-LDs with new grating structure is promising for intermediate transmission applications.

Paper Details

Date Published: 18 December 2000
PDF: 8 pages
Proc. SPIE 4111, Terahertz and Gigahertz Electronics and Photonics II, (18 December 2000); doi: 10.1117/12.422162
Show Author Affiliations
Tetsuro Okuda, NEC Corp. (Japan)
Yidong Huang, NEC Corp. (Japan)
Kenji Sato, NEC Corp. (Japan)
Yoshiharu Muroya, NEC Corp. (Japan)


Published in SPIE Proceedings Vol. 4111:
Terahertz and Gigahertz Electronics and Photonics II
R. Jennifer Hwu; Ke Wu, Editor(s)

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