Coherent light generators – Particular beam control device – Producing plural wavelength output
Reexamination Certificate
2001-03-17
2001-12-04
Scott, Jr., Leon (Department: 2881)
Coherent light generators
Particular beam control device
Producing plural wavelength output
Reexamination Certificate
active
06327283
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to optical communications systems, in general, and to a laser source for use in such communications systems, in particular.
It is desirable to provide a laser source that can provide an optical output that is switchable to a plurality of different wavelengths. It is particularly desirable that such a laser source be capable of switching from one wavelength to another at a rapid rate.
SUMMARY OF THE INVENTION
A laser source in accordance with the invention includes a broadband laser generating optical output signals including a plurality of predetermined wavelength components. A bi-directional optical switch having a first port and a plurality, N, of second ports, is responsive to control signals for establishing an optical coupling between said first port and a selected one of the plurality of second ports. A circulator having a first port is coupled to the broadband laser, a second port is coupled to the bi-directional optical switch first port and a third port for providing output optical signals. A plurality of wavelength selective reflectors is provided. Each wavelength selective reflector is coupled to a corresponding one the optical switch second ports, each of the wavelength selective reflectors reflects optical signals at a predetermined one optical wavelength selected from a plurality of predetermined optical wavelength. Apparatus is provided for generating the control signals. The control signal generating apparatus comprises a micro controller in one embodiment of the invention.
In one embodiment in accordance with the invention, bias circuitry is coupled to the bi-directional optical switch and to the micro controller.
In an embodiment in accordance with the invention an optical switch is formed on a first substrate of electro-optic material. The substrate comprises LiNbO
3
.
A second substrate carrying said plurality of wavelength selective reflectors. In one embodiment, the second substrate comprises silicon and is bonded to said first substrate.
Each reflective filter comprises a Bragg grating that in one embodiment of the invention is a fiber Bragg grating.
Jr. Leon Scott
Lenkszus, P.C Donald J.
Micro Photonix Integration Corporation
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