CN205374827U - Optical transmission module - Google Patents

Abstract

The utility model provides an optical transmission module, it includes the module body, be equipped with laser instrument driver chip, laser instrument chip and control detector on the module body, control detector and laser instrument chip are all established in the place ahead of laser instrument driver chip's front end, and the rear end of laser instrument chip is towards laser instrument driver chip, be equipped with a speculum between the rear end of laser instrument chip and the control detector for the light reflex of sending laser instrument chip rear end is to the receipt face of control detector. Adopt above -mentioned structure, size that can the minimize module to the function of monitoring the detector is remain, laser instrument chip to distance between the laser instrument driver chip can also be shortened as far as possible.

Description

Optical Transmitter Module

technical field

The utility model relates to the technical field of optical fiber communication, in particular to an optical emission module.

Background technique

In high-speed optical transmission systems, the optical transmitter module in optical signal transceivers is very important, especially for high-speed lasers above 25G. In this light emitting module, the length of the connection line between the laser chip (LDChip) and the laser driver chip (LDD) will seriously affect the quality of signal transmission, therefore, the shorter the distance between the laser chip and the laser driver chip, The better the quality of the signal transmission. In order to monitor whether the laser detector is working normally, in the laser chip, the front end of the laser chip is used to send laser light, a small amount of light will leak out from the back end of the laser chip, and a monitoring detector (MPD) will be set at the back end of the laser chip. To sense the light emitted from the back end of the laser chip, so that the laser can be monitored.

In the prior art, in order to enable the monitoring detector to sense the light emitted from the back end of the laser chip, the monitoring detector is placed directly behind the laser chip, in order to prevent the light receiving surface of the monitoring detector from reflecting the received light back to the laser In the chip, the receiving surface of the monitoring detector is used to form a certain angle with the optical axis emitted by the laser chip. Due to the high-speed laser, it is necessary to integrate the laser chip and the laser driver chip into one module. Therefore, in order to shorten the distance as much as possible, it is necessary to put the laser driver chip on the side of the laser chip, so that the width of the entire module becomes larger. Therefore, the size of the entire optical signal transceiver becomes larger.

Utility model content

The technical problem to be solved by the utility model is to overcome the defects of the prior art, provide a light module that can reduce the size of the module as much as possible, retain the function of the monitoring detector, and shorten the distance between the laser chip and the laser driver chip as much as possible. launch module.

In order to solve the above-mentioned technical problems, the utility model provides a light emitting module, which includes a module body, on which a laser driver chip, a laser chip and a monitoring detector are arranged, and the monitoring detector and the laser chip are both arranged on In front of the front end of the laser driver chip, the rear end of the laser chip faces the laser driver chip, and a reflector is arranged between the rear end of the laser chip and the monitoring detector for reflecting the light emitted by the rear end of the laser chip to the monitoring detector on the receiving side of the receiver.

After adopting the above structure, a small amount of light emitted from the rear end of the laser chip can be irradiated to the receiving surface of the monitoring detector through the reflection of the reflector, so that the monitoring detector can monitor the work of the laser chip, and the monitoring detector and the laser chip are both It can be arranged in front of the front end of the laser driver chip instead of on the side of the laser driver chip, so the width of the module body will be greatly reduced, and since the monitoring detector does not need to be arranged behind the rear end of the laser chip, the laser chip and There is only one reflector between the laser driver chips, so the distance between the laser chip and the laser driver chip can be very short.

The incident angle of the light emitted from the rear end of the laser chip on the reflector is 20-60 degrees. Adopting this angle range can make the positions of the reflective mirror, the laser chip and the monitoring detector, which can not only ensure that the light emitted from the rear end of the laser chip is reflected to the receiving surface of the monitoring detector through the reflective mirror, but also make the position of the three The distance between them is relatively short, so that the space occupied by the module body is small.

The incident angle of the light emitted from the rear end of the laser chip on the reflector is 30-45 degrees. It is more appropriate to use this angle range.

The monitoring detector is arranged obliquely so that the light incident on the receiving surface of the monitoring detector from the reflector and reflected is irradiated on the side of the laser chip. With this structure, the light emitted from the receiving surface of the monitoring detector will not enter into the laser chip, that is, it will not interfere with the laser chip.

Description of drawings

Fig. 1 is a schematic diagram of the position arrangement of the light transmitting module in the prior art;

Fig. 2 is a schematic diagram of the location arrangement of the light emitting module in the present invention.

As shown in the figure: 1. Module body, 2. Laser driver chip, 3. Laser chip, 4. Monitoring detector, 5. Mirror, 6. Lens, 7. Isolation device, 8. Optical fiber.

detailed description

Below in conjunction with accompanying drawing and specific embodiment, the utility model is described in further detail:

Fig. 1 is the structure schematic diagram of the light transmitting module of prior art, as shown in the figure: the module body 1 is provided with monitoring detector 4, laser chip 3 and laser driver chip 2, and monitoring detector 4 is placed on the laser chip 3 Directly behind, in order to prevent the light receiving surface of the monitoring detector 4 from reflecting the received light back into the laser chip 3 , the receiving surface of the monitoring detector 4 is adopted to form a certain angle with the optical axis emitted by the laser chip 3 . In order to make the distance between the laser chip 3 and the laser driver chip 2 relatively close, the laser chip 3 and the monitoring detector 4 are arranged on the side of the laser driver chip 2 so that the laser chip 3 is close to the laser driver chip 2 . In this manner, the entire structure occupies a larger space on the module body, which inevitably increases the width of the module body, making the entire module larger.

Fig. 2 is a structural schematic diagram of the optical emission module of the present invention, as shown in the figure: the utility model provides an optical emission module, which includes a module body 1, and the module body 1 is provided with a laser driver chip 2 and a laser chip 3 And the monitoring detector 4, the monitoring detector 4 and the laser chip 3 are all arranged in front of the front end of the laser driver chip 2, the rear end of the laser chip 3 faces the laser driver chip 2, the rear end of the laser chip 3 and the monitoring A mirror 5 is arranged between the detectors 4 for reflecting the light emitted from the rear end of the laser chip 3 to the receiving surface of the monitoring detector 4 . Wherein, the end of the laser driver chip 2 used to connect with the laser chip 3 is called the front end of the laser driver chip 2 .

The front end of the laser chip 3 emits laser light, which enters into the optical fiber after passing through the lens 6 and the isolation device 7 . The laser driver chip 2 drives the laser chip 3 to emit laser light. In order to monitor the laser chip 3, when the front end of the laser chip 3 emits laser light, the rear end of the laser chip 3 also emits a small amount of light, which is detected by the monitoring detector 4, thereby The operation of the laser chip 3 can be monitored.

After adopting the above structure, a small amount of light emitted from the rear end of the laser chip can be irradiated to the receiving surface of the monitoring detector through the reflection of the reflector, so that the monitoring detector can monitor the work of the laser chip, and the monitoring detector and the laser chip are both It can be arranged in front of the front end of the laser driver chip instead of on the side of the laser driver chip, so the width of the module body will be greatly reduced, and since the monitoring detector does not need to be arranged behind the rear end of the laser chip, the laser chip and There is only one reflector between the laser driver chips, so the distance between the laser chip and the laser driver chip can be very short.

The incident angle a of the light emitted from the rear end of the laser chip 3 on the mirror 5 is 20-60 degrees. Adopting this angle range can make the positions of the reflective mirror, the laser chip and the monitoring detector, which can not only ensure that the light emitted from the rear end of the laser chip is reflected to the receiving surface of the monitoring detector through the reflective mirror, but also make the position of the three The distance between them is relatively short, so that the space occupied by the module body is small.

The incident angle a of the light emitted from the rear end of the laser chip 3 on the mirror is 30-45 degrees. It is more appropriate to use this angle range.

The monitoring detector 4 is arranged obliquely so that the light incident on the receiving surface of the monitoring detector 4 from the reflector 5 and reflected is irradiated on the side of the laser chip 3 . With this structure, the light emitted from the receiving surface of the monitoring detector will not enter into the laser chip, that is, it will not interfere with the laser chip. The inclined setting of the monitoring detector 4 means that there is a certain angle between the monitoring detector 4 and the reflector 5, so that the light reflected by the reflector on the receiving surface of the monitoring detector 4 is reflected again by the receiving surface of the monitoring detector 4 The light irradiates the side of the laser chip 3 without being reflected into the laser chip 3 .

Claims (4)

1. a light emission module, it includes module body, described module body is provided with laser driving chip, chip of laser and monitoring detector, it is characterized in that: described monitoring detector and chip of laser are each provided at the front of the front end of laser driving chip, the rear end of chip of laser is towards laser driving chip, it is provided with a reflecting mirror, for the receiving plane of the luminous reflectance that sent chip of laser rear end to monitoring detector between rear end and the monitoring detector of described chip of laser.

2. light emission module according to claim 1, it is characterised in that: the angle of the light that the rear end of described chip of laser sends angle of incidence on the mirror is 20～60 degree.

3. light emission module according to claim 2, it is characterised in that: the angle of the light that the rear end of described chip of laser sends angle of incidence on the mirror is 30～45 degree.

4. light emission module according to claim 1, it is characterised in that: described monitoring detector is obliquely installed so that the light inciding on the receiving plane of monitoring detector from reflecting mirror and reflect away is radiated at the side of chip of laser.