Adiabatic Y-branch modulator with negligible chirp

Details Adiabatic Y-branch modulator with negligible chirp Adiabatic Y-branch modulator with negligible chirp

1997-08-14

2000-05-16

Ngo, Hung N.

Optical waveguides

With optical coupler

Particular coupling structure

385 43, 385 4, 385 22, G02B 610

Patent

active

060647884

ABSTRACT:
Methods of using an adiabatic Y-branch digital optical modulator provide a substantially chirp-free modulator by changing the refractive index of only a first output branch of the modulator in response to a modulating signal. A second output branch of the modulator, where no refractive index change is induced, is used as the modulator output. The frequency chirp in this Y-branch modulator is negligible because the modulator output waveguide branch experiences little or no refractive index change and, therefore, little or no phase shift in operation. Substantially all of the phase shift occurs in the waveguide branch where the refractive index change is induced. According to a further embodiment, one or both of the output branches are comprised of one or more tapered waveguide sections.

REFERENCES:
patent: 4753505 (1988-06-01), Mikami et al.
patent: 5129017 (1992-07-01), Kawano et al.
patent: 5333231 (1994-07-01), Fukuda et al.
patent: 5408544 (1995-04-01), Seino
patent: 5408566 (1995-04-01), Eda et al.
patent: 5432873 (1995-07-01), Hosoya et al.
patent: 5455433 (1995-10-01), Komatsu
patent: 5461684 (1995-10-01), Vinchant et al.
patent: 5481636 (1996-01-01), Fukuda et al.
patent: 5594818 (1997-01-01), Murphy
patent: 5617493 (1997-04-01), Nishimoto
patent: 5712935 (1998-01-01), Miyakawa
J. F. Vinchant et al., "Low driving voltage of current digital optical switch on InP for multiwavelength system applications," Electronics Letters, 4 (Jun. 1992).
"Weighted-Coupling Y-Branch Optical Switch in InGaAs/InAaAlAs Quantum Well Electron Transfer Waveguides," Khan et al, IEEE Photonics Technology Letters, vol. 3, Mar. 1994, pp. 394-397.
"Design and Demonstration of Weighted-Coupling Digital Y-Branch Optical Switches in InGaAs/InGaAlAs Electron Transfer Waveguides," Khan et al, Journal of Lightwave Technology, vol. 12, No. 11, Nov. 1994, pp. 2032-2039.
"Digital Optical Switch," Silberberg et al, Appl. Phys. Lett. 51(16), Oct. 19, 1987, pp. 1230-1232.
"Shaping the Digital Switch," W. K. Burns, IEEE Photonics Technology Letters, vol. 4, No. 8, Aug. 1992, pp. 861-883.

Affiliated with

Also associated with

Rating

Adiabatic Y-branch modulator with negligible chirp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Adiabatic Y-branch modulator with negligible chirp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Adiabatic Y-branch modulator with negligible chirp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-265978