Lithium niobate optical modulator

Details Lithium niobate optical modulator Lithium niobate optical modulator

2003-09-09

2008-12-02

Hughes, James P (Department: 2883)

Optical waveguides

Directional optical modulation within an optical waveguide

Electro-optic

C385S002000, C385S004000, C385S009000, C385S014000, C385S039000, C385S040000, C385S130000, C385S131000, C359S246000, C359S254000

Reexamination Certificate

active

07460739

ABSTRACT:
An optical modulator comprises a Z-cut lithium niobate substrate (21) on which is formed a Mach-Zehnder interferometer having two generally parallel waveguides (23, 25) lying beneath a buffer layer of dielectric material (27). First and second ground electrodes (29, 33) and a hot electrode (31) are disposed on the buffer layer (27), the first and second ground electrodes (29, 33) being spaced either side of the hot electrode (31), the hot electrode (31) and the first ground electrode (29) being proximate to at least apart of the respective waveguides (25, 23). The electrode structure is unsymmetrical in that (a) the hot electrode and the first ground electrode each have a width substantially less than that of the second ground electrode and or (b) the spacing between the first ground and hot electrodes is different from the spacing between the second ground and hot electrodes. whereby a range of chirp values can be obtained. When the spacing (G1) between the first ground and hot electrodes (29, 31) is smaller than the spacing (G2) between the second ground and hot electrodes (33, 31), and preferably the hot and first ground electrodes have a width not exceeding 15 μm, the modulator is capable of operation at frequencies above 10 GHz, possibly up to around 40 GHz.

REFERENCES:
patent: 5404412 (1995-04-01), Seino et al.
patent: 5416859 (1995-05-01), Burns et al.
patent: 5422966 (1995-06-01), Gopalakrishnan et al.
patent: 5644664 (1997-07-01), Burns et al.
patent: 5748358 (1998-05-01), Sugamata et al.
patent: 5790719 (1998-08-01), Mitomi et al.
patent: 6198855 (2001-03-01), Hallemeier et al.
patent: 6760493 (2004-07-01), Pruneri et al.
patent: 2002/0141679 (2002-10-01), Dol et al.
patent: 2002/0167711 (2002-11-01), Nespola et al.
patent: 2003/0002766 (2003-01-01), Pruneri et al.
patent: 2003/0228081 (2003-12-01), Tavlykaev et al.
patent: 2006/0228065 (2006-10-01), Burns
patent: 0 813 092 (1997-12-01), None
patent: WO 96/36901 (1996-11-01), None
patent: WO 2004025362 (2004-03-01), None
PCT Search Report, Internation Application No. PCT/EP 03/10093, dated Feb. 19, 2004.
Tsutomu Kotoh and Kenji Kawano, Modeling and Design of Ti: LiNbO3Optical Modulator Electrodes With A Buffer Layer, Electrodes and Communications in Japan, Part 2, vol. 76, No. 1, 1993, ISSN 8756-663X/93/0001-0025, 1993 Scripta Technica, Inc., p. 25-34.
Kazuto Noguchi, Osamu Mitomi, and Hiroshi Miyazawa, Millimeter-Wave Ti: LiNbO3Optical Modulators, Journal of Lightwave Technology, vol. 16, No. 4, Apr. 1998, p. 615-619.

Affiliated with

Also associated with

Rating

Lithium niobate optical modulator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Lithium niobate optical modulator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Lithium niobate optical modulator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4040113