Modulating circuit for semiconductor optical modulator

Details Modulating circuit for semiconductor optical modulator Modulating circuit for semiconductor optical modulator

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.

REFERENCES:
patent: 4577320 (1986-03-01), Yoshikawa et al.
patent: 5018154 (1991-05-01), Ohashi
Journal of Lightwave Technology, vol. 6, No. 6, 1 Jun. 1988, pp. 779-785, XP000112480 Suzuki M et al: "Electrical and Optical Interactions Between Integrated INGAASP/INP DFB Lasers and Electroabsorption Modulators" Chapter IV-C pp. 782-783; figures 8, 9.
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.
Applied Physics Letters, vol. 57, No. 11, Sep. 10, 1990, USA, pp. 1081-1083, XP002015363 Wood T.H. et al: "Electric field screening by photogenerated holes in multiple quantum wells: A new mechanism for absorption saturation", p. 1081, left-hand column, last paragraph--right--hand column, last paragraph; figures 1, 2.
"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.

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