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1. WO2006099128 - METHOD AND APPARATUS FOR CWDM OPTICAL TRANSMITTER WITH EXTENDED OPERATING TEMPERATURE RANGE

Publication Number WO/2006/099128
Publication Date 21.09.2006
International Application No. PCT/US2006/008583
International Filing Date 10.03.2006
IPC
H01S 5/024 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
5Semiconductor lasers
02Structural details or components not essential to laser action
024Cooling arrangements
CPC
H01S 5/02415
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
5Semiconductor lasers
02Structural details or components not essential to laser action
024Cooling arrangements
02407Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling
02415by using a thermo-electric cooler [TEC], e.g. Peltier element
H01S 5/02453
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
5Semiconductor lasers
02Structural details or components not essential to laser action
024Cooling arrangements
02453Heating, e.g. the laser is heated for stabilisation against temperature fluctuations of the environment
Applicants
  • HARMONIC INC. [US]/[US] (AllExceptUS)
  • BONEN, Adi [CA]/[US] (UsOnly)
  • NGUYEN, Hoa [US]/[US] (UsOnly)
  • CHEN, LiPing [US]/[US] (UsOnly)
  • HUANG, Wei [US]/[US] (UsOnly)
Inventors
  • BONEN, Adi
  • NGUYEN, Hoa
  • CHEN, LiPing
  • HUANG, Wei
Agents
  • KLIVANS, Norman, R.
Priority Data
11/078,97110.03.2005US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND APPARATUS FOR CWDM OPTICAL TRANSMITTER WITH EXTENDED OPERATING TEMPERATURE RANGE
(FR) PROCEDE ET APPAREIL POUR EMETTEUR OPTIQUE CWDM A GAMME DE TEMPERATURES DE FONCTIONNEMENT ETENDUE
Abstract
(EN)
An optical transmitter for coarse wavelength division multiplexed (CWDM) optical communication systems uses a conventional laser (e.g. laser diode) and in addition a heater element is provided thermally coupled to the laser. A thermal sensor and associated control circuit drive the heater so as to control the power consumed by the heater to assure that the laser's temperature is not lower than a predetermined minimum working temperature. When the sensed laser temperature is above this predetermined minimum temperature, the control circuit turns off the heater. The total operating range of the transmitter in terms of ambient temperature is thus extended beyond its inherent operating range by the maximum laser temperature rise created by the heater. This allows a CWDM optical transmitter with the heater and control circuitry to be used in outdoor applications where a wide ambient temperature range is required.
(FR)
L'invention concerne un émetteur optique pour systèmes de communications optiques à multiplexage par division en longueur d'onde approximatif, lequel utilise un laser classique (par exemple une diode laser) et en plus un élément chauffant est prévu couplé thermiquement au laser. Un capteur thermique et un circuit de commande associé commandent l'élément chauffant de manière à régler la puissance consommée par l'élément chauffant pour assurer que la température du laser n'est pas inférieure à une température de fonctionnement minimum prédéterminée. Lorsque la température détectée du laser est supérieure à cette température minimum prédéterminée, le circuit de commande coupe l'élément chauffant. La gamme de fonctionnement totale de l'émetteur, en termes de température ambiante, est ainsi étendue au-delà de sa gamme de fonctionnement inhérente par la montée de température maximum du laser créée par l'élément chauffant. Ceci permet d'utiliser un émetteur optique CWDM avec l'élément chauffant et le circuit de commande dans des applications extérieures où une large gamme de températures ambiantes est requise.
Also published as
EP6737734
Latest bibliographic data on file with the International Bureau