Electro-absorption reverse bias voltage tuning method for eml laser

Abstract

The invention discloses an evolutionary operation algorithm for an electric absorption reverse bias voltage of an EML (electo-absorption modulated laser) The electric absorption reverse bias voltage evolutionary operation includes: firstly, setting the minimum initial value of the electric absorption reverse bias voltage, and then adjusting values of light eye pattern intersection, extinction ratio, temperature and automatic laser power controlling so that the light eye pattern intersection, the extinction ratio, an output laser power and operating wavelength of the EML laser can meet requirements of utilization; detecting whether the electric absorption reverse bias voltage VEA reaches the maximum value of a set electric absorption reverse bias voltage range or not; and if not, gradually increasing the VEA value till bias current, the output laser power, the extinction ratio, the light eye pattern intersection and light eye pattern surplus all meet a set range requirement, and then determining that the VEA value is the optimal VEA value. By the evolutionary operation algorithm, the EML laser is guaranteed to obtain the minimum dispersion during long-distance transmission, and yield rate of the EML laser is increased.

Description

technical field [0001] The invention relates to the field of photoelectric communication, in particular to an electroabsorption reverse bias voltage tuning algorithm of an EML laser. Background technique [0002] Transmitter Optical Subassembly (TOSA for short) is an optical device that converts electrical signals into optical signals. One of the more important lasers in TOSA lasers is EML laser (electro-absorption modulated laser). EML laser adopts the integrated packaging technology of electro-absorption modulator and high-speed DFB laser. Components such as thermistors have the characteristics of high integration, high speed, and high isolation. EML lasers can be used in the field of high-speed data transmission and communication, especially the use of high-precision negative temperature coefficient thermistors (NTC) as temperature sensors, with MCU (microprocessor) as the control core, through precise temperature control of EML lasers, Suitable for long-distance transm...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiency in the prior art that the optimal VEA value of the EML laser cannot be accurately found out, and to provide an electro-absorption reverse bias voltage tuning algorithm for an optical transmitter, which can Accurately find out the electro-absorption reverse bias voltage value that makes TOSA work best

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