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Error signal generation system

A laser, laser cavity technology, applied in laser cooling devices, lasers, laser parts and other directions, can solve the problems of unstable wavelength, reducing the emission output power and so on

Inactive Publication Date: 2007-11-21
INTEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, tunable telecommunication transmit lasers are susceptible to non-optimal settings of tunable elements due to ambient thermal fluctuations that cause wavelength instability and reduce transmit output power

Method used

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  • Error signal generation system
  • Error signal generation system
  • Error signal generation system

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Embodiment Construction

[0020] With particular reference to the drawings, for purposes of illustration, the present invention is embodied as an apparatus and method as shown in FIGS. 1 to 7 . It will be understood that the apparatus may vary in details as to configuration and components, and the method may vary in details and order of execution, without departing from the underlying principles disclosed herein. The invention is primarily disclosed in terms of use with external cavity lasers. However, it will be apparent to those skilled in the art that the present invention can be used with other laser devices and optical systems. It should also be understood that the technical terms used here are only for the purpose of describing specific embodiments, and are not intended to be limiting.

[0021] Referring to FIG. 1, there is shown an external cavity device 10 employing thermal control of the external cavity optical path length in accordance with the present invention. The device 10 comprises a f...

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Abstract

A laser apparatus (20) and method that uses active thermalization of a reflective element to minimize losses and provide wavelength stability. The laser comprises first and second reflectors (24,28) defining an external cavity, and a compensating member (16) coupled to at least one of the reflectors (24) and configured to thermally position one reflector (24) with respect to the other reflector (28). The thermal positioning may be carried out by a thermoelectric controller (18) operatively coupled to the compensating member (16) and configured to thermally adjust the compensating member (16) by heating or cooling thereof. The laser apparatus (20) may comprise a gain medium (22) having first and second output facets (26,28) and emitting a coherent beam from the first facet along an optical path (32). The first reflector (24) is positioned in the optical path (32), with the second output facet (28) and first reflector (24) defining an output cavity.

Description

technical field [0001] There is a constant need for increased bandwidth in fiber optic telecommunications. One approach to bandwidth extension has been achieved with the modulation of each data stream occurring on a different channel through Dense Wavelength Division Multiplexing (DWDM), where multiple independent data streams coexist in a single fiber. Each data stream is modulated onto the output beam of a corresponding semiconductor emitting laser operating at a particular channel wavelength, and the modulated outputs from the semiconductor lasers are combined onto a single optical fiber for transmission in their respective channels. The International Telecommunication Union (ITU) currently requires a channel spacing of about 0.4 nanometers or about 50 GHz. This channel spacing allows up to 128 channels to be carried on a single fiber within the bandwidth of currently available fibers and fiber amplifiers. Improvements in fiber optic technology and the increasing need for...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/04H01S3/102G02F1/01G02F1/21H01S5/14
CPCH01S5/14G02F1/21G02F1/0121
Inventor A·V·图加诺夫M·S·赖斯M·E·麦唐纳B·V·约翰森P·C·-H·林
Owner INTEL CORP