Temp. compensating method and apparatus for extinction ratio parameter without cooling laser
A temperature compensation and laser technology, applied in optical fiber transmission, eliminating distortion/dispersion, etc., to achieve good extinction ratio compensation accuracy and meet the effect of mass production
Inactive Publication Date: 2006-11-15
ZTE CORP
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[0009] The technical problem to be solved by the present invention is to provide a temperature compensation method and device for the extinction ratio parameter of an uncooled laser, and to solve the technical problem that each uncooled laser needs to be calibrated at multiple temperature points in the prior art
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[0031] Specific embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0032]The present invention uses a temperature detector and a digital potentiometer / DA converter in the modulation current control circuit, and simulates the test data by testing the modulation current values required for stable extinction ratios at multiple temperature points on several unrefrigerated laser samples Obtain the relationship between the required modulation current and temperature and other parameters, and set the output of the digital potentiometer / DA conversion accordingly, so that the extinction ratio is constant when the temperature changes.
[0033] The method of the invention is characterized by simplicity, high efficiency and good compensation precision, and meets the requirements of large-scale production.
[0034] The invention is based on the idea that the value of the modulation current required by an uncoole...
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The invention discloses the temperature compensating method and the setting of the extinction ratio parameter of the laser without the refrigeration, the temperature measuring setting, the controlling setting and the digital electricity position setting / DA switching setting are adopted in the adjusting current controlling circuit of the laser setting without the refrigeration, one determined in advance function relation can be written into the controller, the said function relation can maintain the relation between the adjusting current with the constant extinction rate and the existing temperature during the temperature changing course, the said adjusting current can be controlled and exported by the digital electric digit setting / DA controller, the several temperature adjusting on the every laser without the refrigeration can be avoided, the needing of the mass production can be satisfied on the instance of the ensuring the compensating precision. The invention can adjust the laser on the norm temperature, and the adjusting course is containing in the adjusting course of the laser driving circuit.
Description
technical field [0001] The invention relates to a digital optical fiber transmission system, in particular to a method and a device for compensating the extinction ratio parameter of an output light signal of an unrefrigerated laser in the optical transmission system. Background technique [0002] There are a large number of applications of uncooled lasers in optical communication equipment, and they are generally used in direct modulation applications. At this time, the bias current provided to the uncooled laser is usually near its threshold current, and the modulation current carrying the digital logic signal is added above the bias current. If define P 1 and P 0 are respectively the output optical power of the laser when the digital logic signal is "1" and "0", then the average output optical power P of the laser = (P 1 +P 0 ) / 2, extinction ratio index ER=P 1 / P 0 . When the temperature changes, in order to keep the optical transmission performance stable, it is r...
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IPC IPC(8): H04B10/2507
Inventor 许昌武华锋
Owner ZTE CORP