Coherent light generators – Particular component circuitry – Optical pumping
Patent
1996-07-15
1998-03-24
Davie, James W.
Coherent light generators
Particular component circuitry
Optical pumping
372 26, 372 29, H01S 310
Patent
active
057320977
ABSTRACT:
A modulating circuit for a semiconductor optical modulator is composed of a driver 3 DC-coupled to an optical modulator 2, a load resistor 4 connected in parallel to the modulator 2, and a constant current source 5 connected in parallel to the optical modulator 2 for drawing out the photo-current generated in the optical modulator 2 by absorption of light emitted from a semiconductor laser. The modulating circuit can perform light intensity modulation with low wavelength chirping using a driver DC-coupled to the optical modulator 2. The drawing out current is approximately equal to or more than an average of photo-current which is generated in the optical modulator 2 by light absorption at the time of modulation.
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IEEE Photonics Technology Letters, vol. 4, No. 7, 1 Jul. 1992, pp. 720-723, XP000289295, Devaux F et al: "INGAASP/INGAASP Multiple-Quantum-Well Modulator with Improved Saturation Intensity and Bandwidth Over 20 GHZ" the whole document.
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"Low chirp transmission at 5.0Gbit/s using an integrated DBR laser-modulator transmitter", Electronics Letters, vol. 30, No. 16 4th Aug. 1994, pp. 1330-1331.
"Transmission beyond the dispersion limit using a negative chirp electroabsorption modulator," Electronics Letters, vol. 30 No. 14, 7th Jul. 1994, pp. 1168-1169.
Watanabe Nobutaka
Yamaguchi Masayuki
Davie James W.
NEC Corporation
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