Method for manufacturing 1310/1550 laser having high stability and low return loss at working temperature

Abstract

The invention discloses a method for manufacturing 1310 / 1550 laser having high stability and low return loss at working temperature, belonging to the field of optical communication active devices. The technical proposal is as follows: firstly determining the light-emitting diode core wave length range of the corresponding laser at normal temperature; secondly, customizing an isolator for the light-emitting diode core wave length range of the corresponding laser at normal temperature, wherein corresponding wave length of peak value isolation of the isolator is 3-6 mum more than the actual measurement of the light-emitting diode core wave length range of the corresponding laser at normal temperature; thirdly, manufacturing a special tube for containing the tube core and a special contact pin bushing for containing the isolator and ladle needle inserting core; fourthly, correspondingly coupling the tube core and the isolator with the laser according to the peak value isolation of the isolator being 3-6 mum more than the tube core wave length of the laser at normal temperature; fifthly, welding to fix all the metal components of the laser and detecting the finished product.

Description

technical field [0001] The invention relates to the field of optical communication active devices, in particular to an effective method for producing a laser with high stability and low return loss under working conditions. Background technique [0002] The laser light sources currently on the market can use Fabry-Root lasers (FP-LD), distributed feedback lasers (DFB-LD) and other light-emitting devices according to different applications, among which DFB-LD is very suitable for long-distance systems . In order to reduce the impact of light reflection on the optical signal and reduce the return loss value, the current traditional manufacturing method of lasers is to use a diode core with a wavelength of 1310 / 1550 standard ±10μm and a peak isolation of 1310 / 1550 The ±10μm wavelength isolator is randomly matched with wavelengths for coupling to achieve the maximum output optical power to produce lasers. [0003] However, unfortunately, there are many disadvantages in this tr...

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Problems solved by technology

[0008] Since the RF optical module using the laser is installed in the optical fiber repeater, under normal circumstances, when the optical module is in the working state, the temperature of the chassis will be higher than the normal temperature. When the isolation degree of the isolator is within the qualified range, the isolation degree of the isolator at the working wavelength of the laser die cannot meet the requirements for isolating reflected light. The increase in the return loss value will lead to a decrease in the overall performance of the optical module, and even the paralysis and failure of the entire optical transmission system. collapse

For example: when the normal temperature wavelength of the laser light-emitting diode die is 1310μm+10μm, and the corresponding wavelength of the peak isolation of the randomly paired isolator is 1310μm-10μm, the laser and the isolator may both be qualified products at room temperature, but in the working state, The laser light-emitting diode die may have drifted to 1326 μm, and the peak isolation of the isolator is still at 1300 μm. The isolation at 1326 μm is likely to be unable to effectively isolate the emitted light. The laser produced by pairing them There is also an increase in the return loss value, poor linear shape, insufficient flatness, severe jitter, and increased low-end noise, and the product is unqualified.

[0009] To sum up, the lasers produced by the current existing methods cannot be normally used in the production of RF optical modules in 3G systems due to their disadvantages and limitations. If the use is mandatory, the consequences are often 50 About % of the active devices have reduced return loss, severe jitter, and low-level noise increase, resulting in flatness and linearity of the entire system that cannot meet the requirements

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