Multi-quantum well optical waveguide with broadband optical...

Details Multi-quantum well optical waveguide with broadband optical... Multi-quantum well optical waveguide with broadband optical...

2005-04-13

2008-10-07

Pak, Sung H (Department: 2874)

Optical waveguides

Planar optical waveguide

Thin film optical waveguide

C385S129000, C385S130000

Reexamination Certificate

active

07433567

ABSTRACT:
A multi-quantum well optical waveguide structure comprises a plurality of active regions including quantum wells with different gain peak wavelengths to provide an ultra broadband optical gain spectrum. Two adjacent sets of active regions having a large band gap difference are connected by a tunneling injection layer to provide smooth electron transport. Single transverse-mode operation is obtained by narrowly tapering the width of the multi-quantum well optical waveguide from the center to the two ends. Higher-order modes are suppressed at the output of the tapered waveguide, even though the center waveguide portion supports higher-order modes. In this way, the multi-quantum well optical waveguide can be utilized for ultra broadband optical amplification using a single mode fiber.

REFERENCES:
patent: 5224114 (1993-06-01), Ikeda et al.
patent: 2001/0043629 (2001-11-01), Sun et al.
S. Ikeda, et al., “Semiconductor laser devices with a plurality of light emitting layers having different bands gap and methods for driving the same”, IEEE Photonics Technology Letters, vol. 16, No. 2, Feb. 2004.
C.C. Huang, et al., “174-nm mode spacing in dual-wavelength semiconductor laser using non-identical InGaAsP quantum wells”, IEEE Photonics Technology Letters, vol. 16, No. 2, pp. 371-373, Feb. 2004.

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