Direct modulation laser

Abstract

The invention discloses a direct modulation laser comprising a TO tube base, a TO tube cap, a thermoelectric refrigerating unit, a laser chip heat sink, a laser chip, a backlight monitoring chip, a detection chip heat sink and a base plate. The invention also discloses a manufacturing method of the device. According to the laser provided by the invention, the thermoelectric refrigerating unit is packaged in the laser, is low in power consumption and stable in temperature, and can accurately control the temperature, and thus a chirp effect is effectively inhibited, and wavelength division multiplexing of the DFB laser is achieved; the laser is coaxially packaged, small in size and low in cost, and can be largely applied to a long-distance trunk network; light emitted by the laser chip is directly sent out via a self-converging lens, a secondary lens does not need to be added outside the tube cap, and thus the laser can be directly applied to TOSA and PONTO; the traditional TO adopts a full-reflection sheet to refract a light path upward, so that upward transmission of the light path is achieved; the laser adopts a vertical mounting manner, and does not need the full reflection glass sheet, and thus the cost can be reduced.

Description

technical field [0001] The invention relates to an optical communication device, in particular to a directly modulated laser. Background technique [0002] Semiconductor laser is a light source device in optical fiber communication, which has the characteristics of direct electro-optic conversion, fast response, small size, and long life. There are two main modulation methods of semiconductor laser signals: direct modulation laser (DFB laser) and external modulation laser (EML laser). [0003] Directly modulating a laser refers to modulating the output of the laser by varying the input current. Directly modulated laser (DFB laser) has become the main light source in optical fiber communication due to its dynamic single-mode and fast response; however, its modulation current will cause the change of the refractive index of the active layer, resulting in the modulation of the phase of the light, thus Broaden the operating frequency; and most of the DFB lasers do not have tem...

AI Technical Summary

Problems solved by technology

Directly modulated laser (DFB laser) has become the main light source in optical fiber communication due to its dynamic single-mode and fast response; however, its modulation current will cause the change of the refractive index of the active layer, resulting in the modulation of the phase of the light, thus Broaden the operating frequency; and most of the DFB lasers do not have temperature control at present, resulting in chirp (Chirp) effect, it is difficult to achieve wavelength division multiplexing to achieve long-distance transmission

Some DFB lasers are packaged into temperature-controlled lasers, but they are limited to shell packages, and the cost is relatively high

In addition, the transmission performance of EA lasers is better than that of DFB lasers, but due to the limitation of EA chips, the cost has always been relatively high, and EML laser chips have been monopolized by foreign chip companies, and the price is expensive, which brings inconvenience to people's use.

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