Title :
1.3-μm uncooled DFB laser-diode module with a coupled differential feed for 10-Gb/s ethernet applications
Author :
Sakai, Kiyohide ; Aruga, Hiroshi ; Takagi, Shin-Ichi ; Kawano, Minoru ; Negishi, Masato ; Kondoh, Yousuke ; Kaneko, Shin-Ichi
Author_Institution :
Mitsubishi Electr. Corp., Kanagawa, Japan
Abstract :
A coaxial 10-Gb/s 1.3-μm distributed feedback (DFB) laser-diode module with a coupled differential feed has been developed. The differential cascaded feed with the characteristic impedance of 100 Ω, which consists of a 140-Ω ground-signal-signal-ground (GSSG) leads, a small-sized 60-Ω feed-through, and a 140-Ω wire-bonding pad, provides less sensitivity to the lead length. Integrating with 25-Ω matching resistances and a 60-Ω differential microstrip line, whose length corresponds to one eighth of wavelength at 7 GHz, gives wide-band impedance matching between the feed and the laser diode portion with small power loss. Experiment shows good return loss of greater than 9 dB at 10 GHz, and small change of bit error rate (BER) up to the lead length of 4 mm. With a newly developed 250-μm cavity laser chip, we have demonstrated stable eye diagrams with the mask margins of 31 and 29% at case temperature of 0 and 85°C, respectively.
Keywords :
distributed feedback lasers; error statistics; impedance matching; laser cavity resonators; local area networks; microstrip lines; modules; semiconductor device packaging; semiconductor lasers; 1.3 mum; 10 GHz; 10 Gbit/s; 100 ohm; 140 ohm; 25 ohm; 250 mum; 4 mm; 60 ohm; 7 GHz; 85 degC; BER; GSSG leads; bit error rate; cavity laser chip; characteristic impedance; coupled differential feed; differential microstrip line; distributed feedback laser-diode module; ethernet; eye diagrams; ground-signal-signal-ground leads; mask margins; uncooled DFB laser-diode module; wide-band impedance matching; wire-bonding pad; Bit error rate; Coaxial components; Distributed feedback devices; Ethernet networks; Feeds; Impedance; Laser feedback; Microstrip; Optical coupling; Quantum cascade lasers;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2003.822554
