Optical modulator, optical short pulse generating device, optica

Details Optical modulator, optical short pulse generating device, optica Optical modulator, optical short pulse generating device, optica

1997-06-04

1999-03-30

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359181, 359250, G02F 103

Patent

active

058896074

ABSTRACT:
Incident light 1 is inputted to an electro-absorption-type optical modulator 4 via an optical circulator 2 and a lens 3, and subjected to intensity modulation that corresponds to a modulation signal 8. The optical signal outputted by the electro-absorption-type optical modulator 4 is inputted to a Faraday rotator 6 via a lens 5, and the plane of polarization is rotated 45.degree.. The optical signal transmitted by the Faraday rotator 6 is totally reflected by a totally reflecting mirror 7, inputted for the second time to the Faraday rotator 6, then passed through the lens 5 after the plane of polarization has been rotated 45.degree. by this Faraday rotator 6, and readmitted by the electro-absorption-type optical modulator 4. The output of the electro-absorption-type optical modulator 4 is emitted via the lens 3 and the optical circulator 2. The polarization dependence of insertion loss can be eliminated because the plane of polarization is rotated 90.degree., and the incident light 1 readmitted to the electro-absorption-type optical modulator 4 at any plane of polarization. In view of this, the polarization dependent loss of an electro-absorption-type optical modulator can be eliminated by employing such optical modulators and creating a high-performance optical short pulse generating device, optical waveform shaping device, and optical demultiplexer.

REFERENCES:
patent: 5448579 (1995-09-01), Chang et al.

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