CN216253023U

CN216253023U - High-compatibility double 1550nm laser light transmitter

Info

Publication number: CN216253023U
Application number: CN202122824546.7U
Authority: CN
Inventors: 杨旭峰; 伍伟东
Original assignee: Greatway Technology Co ltd
Current assignee: Greatway Technology Co ltd
Priority date: 2021-11-15
Filing date: 2021-11-15
Publication date: 2022-04-08
Anticipated expiration: 2031-11-15

Abstract

The utility model discloses a high-compatibility double 1550nm laser light transmitter, which comprises: the system comprises a cable television signal processing module, a satellite television signal processing module and a DMDM optical coupler, wherein the cable television signal processing module comprises: the 862MHZ radio frequency amplification driver, the first laser and the optical attenuator; the satellite television signal processing module comprises: 950 MHZ-2150 MHZ filtering and amplifying driver and second laser. The utility model can realize the transmission of various television signals in the bandwidth of 45 MHZ-2150 MHZ, meet various different requirements and has strong practicability; the 2150MHz predistortion circuit capable of supporting the analog television is not required to be developed, the design difficulty of the whole equipment is reduced, and the production design is convenient.

Description

High-compatibility double 1550nm laser light transmitter

Technical Field

The utility model relates to the field of laser light emitting equipment, in particular to a high-compatibility double 1550nm laser light emitter.

Background

At present, the downlink bandwidth of a cable television system is usually 45MHz to 750MHz or 45MHz to 862MHz, 110 NTSC analog television channels or 86 PAL-D analog television channels can be transmitted, each analog television channel adopts a QAM modulation technique, and 3 to 10 sets of high definition or standard definition digital television programs in a DVB-C format can be transmitted. The LNB output of the satellite television is 950 MHz-2150 MHz, and can comprise at most 32 satellite transponder signals, and each transponder comprises 3-15 sets of high-definition or standard-definition DVB-S2 digital television programs. The 45-2150 MHz 1550nm optical transmitter can economically and efficiently provide various programs including an analog television, a DVB-C digital television, a DVB-T digital television and a DVB-S/S2 satellite television signal television for users. The 1550nm optical transmitter can broadcast respective program contents in 45-2150 MHz bandwidth to all users in a network by combining with a mature 1550nm optical fiber signal amplification technology, and is beneficial to network operators to develop respective services.

The cable television predistortion technology in the prior art can solve the distortion compensation of analog television radio frequency signals within 1000MHz, provide good analog television programs, a 1550nm laser with 1000MHz bandwidth is generally provided with a built-in refrigerator, the price is moderate, and DWDM wavelengths of respective ITU-T specifications can be provided. However, the 1550nm laser capable of supporting 3000MHz bandwidth of 45-2150 MHz is expensive, resulting in high production cost and low practicability, and needs to develop a 2150MHz predistortion circuit capable of supporting analog tv, which makes development difficult.

Accordingly, the prior art is deficient and needs improvement.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art, provides a high-compatibility dual 1550nm laser optical transmitter, and solves the problems that in the prior art, 1550nm lasers capable of supporting 45-2150 MHz are low in practicability, a 2150MHz predistortion circuit supporting an analog television needs to be developed, and development difficulty is high.

The technical scheme of the utility model is as follows: a high compatibility dual 1550nm laser optical transmitter, comprising: the system comprises a cable television signal processing module, a satellite television signal processing module and a DMDM optical coupler, wherein the cable television signal processing module comprises: the optical attenuator comprises a 862MHZ radio frequency amplification driver, a first laser and an optical attenuator, wherein the 862MHZ radio frequency amplification driver is used for receiving cable broadband television signals of 45 MHZ-862 MHZ, performing power amplification on the cable broadband television signals and sending the cable broadband television signals to the first laser; the first laser is used for converting cable broadband television signals of 45 MHZ-862 MHZ into first laser signals of 1556.55 nm-1559.79 nm wavelength and transmitting the first laser signals to the optical attenuator; the optical attenuator is used for adjusting the power intensity of the first laser signal and sending the first laser signal to the DMDM optical coupler after the power intensity of the first laser signal is adjusted; the satellite television signal processing module comprises: the filter amplification driver is 950 MHZ-2150 MHZ, and is used for receiving the satellite broadband television signals of 950 MHZ-2150 MHZ, performing power amplification and filtering on the satellite broadband television signals, and sending the satellite broadband television signals to the second laser, and the second laser is used for converting the satellite broadband television signals of 950 MHZ-2150 MHZ into second laser signals with the wavelength of 1550nm +/-3 nm, and sending the second laser signals to the DMDM optical coupler; the DMDM optical coupler is used for coupling the first laser signal and the second laser signal into an optical signal with the wavelength of 1550 nm-1560 nm.

Further, the 862MHZ radio frequency amplification driver includes: the device comprises a first power amplification circuit, a manual adjustable attenuation circuit and a first level control ALC circuit, wherein the manual adjustable attenuation circuit is electrically connected with the first power amplification circuit.

Further, the first power amplifying circuit is used for amplifying the cable broadband television signals of 45 MHZ-862 MHZ received by the 862MHZ radio frequency amplifying driver; the manual adjustable attenuation circuit is used for adjusting the level of a cable broadband television signal of 45 MHZ-862 MHZ received by the 862MHZ radio frequency amplification driver; and the first level control ALC circuit is used for detecting the level of the cable broadband television signal of 45 MHZ-862 MHZ after the level of the cable broadband television signal is adjusted by the manual adjustable attenuation circuit.

Further, the 862MHZ radio frequency amplification driver further comprises: and the MCU auxiliary circuit is used for detecting the optical power, the bias current, the temperature and the refrigeration current of the first laser.

Further, the 950 MHZ-2150 MHZ filtering and amplifying driver comprises: the second power amplification circuit, the filter circuit electrically connected with the second power amplification circuit and the second level control ALC circuit.

Further, the second power amplifying circuit is configured to amplify the satellite broadband television signals of 950MHZ to 2150MHZ received by the filtering and amplifying driver of 950MHZ to 2150MHZ, the filter circuit is configured to filter the satellite broadband television signals of 950MHZ to 2150MHZ received by the filtering and amplifying driver of 950MHZ to 2150MHZ, and the second level control ALC circuit is configured to detect the level of the satellite broadband television signals of 950MHZ to 2150MHZ received by the filtering and amplifying driver of 950MHZ to 2150 MHZ.

Further, the 950 MHZ-2150 MHZ filtering and amplifying driver further includes: a power conversion circuit and a 13V/18V power switching circuit; the power supply conversion circuit is used for converting an input 13V voltage into a 5V or 18V voltage, and the 13V/18V power supply switching circuit is used for providing a +13V or +18V voltage for the LNB head.

Further, the first laser is a DWDM laser, and the second laser is a refrigeration-free laser.

By adopting the scheme, the utility model provides a high-compatibility double 1550nm laser light transmitter, which has the following beneficial effects:

1. the transmission of various television signals in the bandwidth of 45 MHZ-2150 MHZ can be realized, various different requirements are met, and the practicability is high;

2. the 2150MHz predistortion circuit capable of supporting the analog television is not required to be developed, the design difficulty of the whole equipment is reduced, and the production design is convenient.

Drawings

FIG. 1 is a schematic diagram of the principles of the present invention;

fig. 2A is a first circuit diagram of a first power amplifier circuit according to the present invention;

FIG. 2B is a circuit diagram of a second power amplifier circuit and a manually adjustable attenuator circuit according to the present invention;

FIG. 3A is a first circuit diagram of the first level control ALC circuit of the present invention;

FIG. 3B is a circuit diagram two of the first level control ALC circuit of the present invention;

FIG. 4 is a circuit diagram of the MCU auxiliary circuit of the present invention;

FIG. 5 is a circuit diagram of a second power amplifier circuit of the present invention;

FIG. 6 is a circuit diagram of the filter circuit, second level control ALC circuit of the present invention;

FIG. 7A is a first circuit diagram of the power conversion circuit of the present invention;

FIG. 7B is a second circuit diagram of the power conversion circuit of the present invention;

FIG. 7C is a third circuit diagram of the power conversion circuit of the present invention;

FIG. 8 is a circuit diagram of the 13V/18V power switching circuit of the present invention;

FIG. 9 is a circuit diagram of an automatic optical power control APC circuit of the present invention.

Wherein: the system comprises a cable television signal processing module 1, a 862MHZ radio frequency amplification driver 10, a first power amplification circuit 100, a manual adjustable attenuation circuit 101, a first level control ALC circuit 102, an MCU auxiliary circuit 103, a first laser 11, an optical attenuator 12, a satellite television signal processing module 2, a 950 MHZ-2150 MHZ filtering amplification driver 20, a second power amplification circuit 200, a filter circuit 201, a second level control ALC circuit 202, a power supply conversion circuit 203, a 13V/18V power supply switching circuit 204, an automatic optical power control APC circuit 205, a second laser 21 and a DMDM optical coupler 3.

Detailed Description

The utility model is described in detail below with reference to the figures and the specific embodiments.

Referring to fig. 1-9, the present invention provides a high-compatibility dual 1550nm laser optical transmitter, including: the system comprises a cable television signal processing module 1, a satellite television signal processing module 2 and a DMDM optical coupler 3, wherein the cable television signal processing module 1 comprises: the optical attenuator comprises a 862MHZ radio frequency amplification driver 10, a first laser 11 and an optical attenuator 12, wherein the 862MHZ radio frequency amplification driver 10 is used for receiving cable broadband television signals of 45 MHZ-862 MHZ, performing power amplification on the cable broadband television signals and sending the cable broadband television signals to the first laser 11; the first laser 11 is configured to convert a cable broadband television signal of 45MHZ to 862MHZ into a first laser signal of 1556.55nm to 1559.79nm wavelength, so as to facilitate subsequent long-distance optical fiber transmission, and transmit the first laser signal to the optical attenuator 12; the optical attenuator 12 is configured to adjust the power intensity of the first laser signal, so that the first laser signal output by the first laser 11 is adapted to the second laser signal, and send the adjusted power intensity of the first laser signal to the DMDM optical coupler 3; the satellite television signal processing module 2 includes: a 950 MHZ-2150 MHZ filtering and amplifying driver 20, and a second laser 21, where the 950 MHZ-2150 MHZ filtering and amplifying driver 20 is configured to receive a 950 MHZ-2150 MHZ satellite broadband television signal, amplify the power of the satellite broadband television signal, filter the power of the satellite broadband television signal, and send the satellite broadband television signal to the second laser 21, and the second laser 21 is configured to convert the 950 MHZ-2150 MHZ satellite broadband television signal into a second laser signal with a wavelength of 1550nm ± 3nm, and send the second laser signal to the DMDM optical coupler 3; the DMDM optical coupler 3 is configured to couple the first laser signal and the second laser signal into an optical signal with a wavelength of 1550nm to 1560nm, so as to transmit the optical signal through an optical fiber. Specifically, the cable television signal processing module 1 is provided with a 45 MHZ-862 MHZ cable television signal input port, and the satellite television signal processing module 2 is provided with a 950 MHZ-2150 MHZ satellite signal input port; the utility model relates to a high-compatibility double 1550nm laser optical transmitter which receives a cable broadband television signal of 45 MHZ-862 MHZ through a cable television signal processing module 1, amplifies the power of the cable broadband television signal, converts the cable broadband television signal into a first laser signal with the wavelength of 1556.55 nm-1559.79 nm, simultaneously receives a satellite broadband television signal of 950 MHZ-2150 MHZ through a satellite television signal processing module 2, amplifies the power of the satellite broadband television signal, converts the satellite broadband television signal into a second laser signal with the wavelength of 1550nm +/-3 nm, receives the first laser signal and the second laser signal through a DMDM optical coupler 3, couples the first laser signal and the second laser signal into a path of optical signal, outputs the optical signal through an optical fiber, has the wavelength of 1550 nm-1560 nm and can be amplified by EDFA and EYDFA, thereby supporting home arrival of the optical fiber, realizing the transmission of various television signals in the bandwidth of 45 MHZ-2150 and meeting various requirements, the practicability is strong; on the other hand, a 2150MHz predistortion circuit which can support an analog television is not required to be developed, the design difficulty of the whole equipment is reduced, and the production design is convenient.

Specifically, in this embodiment, the 862MHZ radio frequency amplification driver 10 includes: the circuit comprises a first power amplification circuit 100, a manual adjustable attenuation circuit 101, a first level control ALC circuit 102 and an MCU auxiliary circuit 103, wherein the manual adjustable attenuation circuit 101 is electrically connected with the first power amplification circuit 100; the first power amplifying circuit 100 is configured to amplify the 45MHZ to 862MHZ cable broadband television signal received by the 862MHZ radio frequency amplifying driver 10, where the number of times of amplification is two, so as to meet the level requirement required by subsequent signal processing and driving of the first laser 11; the manual adjustable attenuation circuit 101 is used for adjusting the level of the 45 MHZ-862 MHZ cable broadband television signal received by the 862MHZ radio frequency amplification driver 10, and the manual adjustment function of the level of the 45 MHZ-862 MHZ cable broadband television signal can be realized through an adjustable attenuator, so as to meet the requirements of the first laser 11 with different powers on the driving level; the first level control ALC circuit 102 is configured to detect the level of a cable broadband television signal of 45MHZ to 862MHZ after the level of the cable broadband television signal is adjusted by the manual adjustable attenuation circuit 101, and feed back the detection result to an additional control attenuator, so as to ensure the stability of the driving level of the first laser 11, and is not affected by external input level change and internal factors such as temperature; the MCU auxiliary circuit 103 is configured to detect the optical power, the bias current, the temperature, and the cooling current of the first laser 11, and manually or automatically adjust parameters such as the optical power, the bias current, and the cooling current through an external controller.

Specifically, in this embodiment, the 950MHZ to 2150MHZ filtering and amplifying driver 20 includes: a second power amplifying circuit 200, a filter circuit 201 electrically connected with the second power amplifying circuit 200, a second level control ALC circuit 202, a power conversion circuit 203, and a 13V/18V power switching circuit 204; the second power amplifying circuit 200 is configured to amplify the satellite broadband television signals of 950MHZ to 2150MHZ received by the filtering and amplifying driver 20 of 950MHZ to 2150MHZ for three times, so as to meet the requirements of subsequent signal processing and the level required for driving the second laser 21; the filter circuit 201 is configured to filter the 950MHZ to 2150MHZ satellite broadband television signals received by the 950MHZ to 2150MHZ filter and amplification driver 20, so as to filter out satellite broadband television signals other than 950MHZ to 2150MHZ, thereby reducing interference; the second level control ALC circuit 202 is used for detecting the level of the satellite broadband television signal of 950MHZ to 2150MHZ received by the filtering and amplifying driver 20 of 950MHZ to 2150MHZ, and feeding back the detection structure to an external control attenuator to keep the driving level of the second laser 21 stable without being influenced by external input level change and internal factors such as temperature, and further ensure that the second laser 21 outputs a light modulation degree of a stable point; the power conversion circuit 203 is used for converting the input 13V voltage into 5V or 18V voltage so as to meet the requirements of each circuit in the cable television signal processing module 1; the 13V/18V power supply switching circuit 204 is used for providing +13V or +18V voltage for an LNB head, and the LNB head is a reverse satellite tuner LNB and is arranged on a satellite signal input port; specifically, in this embodiment, the 950MHZ to 2150MHZ filtering and amplifying driver 20 further includes: an automatic light power control APC circuit 205, the automatic light power control APC circuit 205 functioning the same as the second level control ALC circuit 202.

In the present embodiment, in particular, the first laser 11 is a DWDM laser,a semiconductor refrigerator is arranged in the DWDM laser, so that the wavelength output by the DWDM laser is ensured to be constant at a DWDM nominal value; the second laser 21 is a refrigeration-free laser; model 1751A for the DWDM laser (see this link for details)www.emcore.com) The uncooled laser is a coaxial uncooled laser manufactured by Belley communications Equipment, Inc., Xiamen, model BLLD-PSA2-5520B-2GR (see this link for details)http://www.belycomm.com/a/ Products/detectors/20160730/71. html), the optical attenuator 12SC APC yin-yang type optical fiber attenuator manufactured by Kunzan optical access communication materials company (see the link for details)http://www.gjtx66.com/products/ scapcy7727.html), the DMDM optical coupler 3Model number DWDM 3port 100G/200G Device (see specifically this link http:// www.htdfiber.com/Product/181. html).

In summary, the utility model provides a high-compatibility dual 1550nm laser optical transmitter, which has the following beneficial effects:

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A highly compatible dual 1550nm laser optical transmitter, comprising: the system comprises a cable television signal processing module, a satellite television signal processing module and a DMDM optical coupler, wherein the cable television signal processing module comprises: the optical attenuator comprises a 862MHZ radio frequency amplification driver, a first laser and an optical attenuator, wherein the 862MHZ radio frequency amplification driver is used for receiving cable broadband television signals of 45 MHZ-862 MHZ, performing power amplification on the cable broadband television signals and sending the cable broadband television signals to the first laser; the first laser is used for converting cable broadband television signals of 45 MHZ-862 MHZ into first laser signals of 1556.55 nm-1559.79 nm wavelength and transmitting the first laser signals to the optical attenuator; the optical attenuator is used for adjusting the power intensity of the first laser signal and sending the first laser signal to the DMDM optical coupler after the power intensity of the first laser signal is adjusted; the satellite television signal processing module comprises: the filter amplification driver is 950 MHZ-2150 MHZ, and is used for receiving the satellite broadband television signals of 950 MHZ-2150 MHZ, performing power amplification and filtering on the satellite broadband television signals, and sending the satellite broadband television signals to the second laser, and the second laser is used for converting the satellite broadband television signals of 950 MHZ-2150 MHZ into second laser signals with the wavelength of 1550nm +/-3 nm, and sending the second laser signals to the DMDM optical coupler; the DMDM optical coupler is used for coupling the first laser signal and the second laser signal into an optical signal with the wavelength of 1550 nm-1560 nm.

2. The high-compatibility dual 1550nm laser optical transmitter according to claim 1, wherein the 862MHZ rf amplification driver comprises: the device comprises a first power amplification circuit, a manual adjustable attenuation circuit and a first level control ALC circuit, wherein the manual adjustable attenuation circuit is electrically connected with the first power amplification circuit.

3. The optical transmitter of claim 2, wherein the first power amplifier circuit is configured to amplify the 45 MHZ-862 MHZ cable broadband tv signal received by the 862MHZ rf amplifier driver; the manual adjustable attenuation circuit is used for adjusting the level of a cable broadband television signal of 45 MHZ-862 MHZ received by the 862MHZ radio frequency amplification driver; and the first level control ALC circuit is used for detecting the level of the cable broadband television signal of 45 MHZ-862 MHZ after the level of the cable broadband television signal is adjusted by the manual adjustable attenuation circuit.

4. The high-compatibility dual 1550nm laser optical transmitter according to claim 2, wherein the 862MHZ rf amplification driver further comprises: and the MCU auxiliary circuit is used for detecting the optical power, the bias current, the temperature and the refrigeration current of the first laser.

5. The high-compatibility dual 1550nm laser optical transmitter according to claim 1, wherein the 950 MHZ-2150 MHZ filter-amplifier driver comprises: the second power amplification circuit, the filter circuit electrically connected with the second power amplification circuit and the second level control ALC circuit.

6. The optical transmitter of claim 5, wherein the second power amplifier circuit is configured to amplify the 950 MHZ-2150 MHZ satellite broadband tv signals received by the 950 MHZ-2150 MHZ filtering and amplifying driver, the filter circuit is configured to filter the 950 MHZ-2150 MHZ satellite broadband tv signals received by the 950 MHZ-2150 MHZ filtering and amplifying driver, and the second level control ALC circuit is configured to detect the level of the 950 MHZ-2150 MHZ satellite broadband tv signals received by the 950 MHZ-2150 MHZ filtering and amplifying driver.

7. The high-compatibility dual 1550nm laser optical transmitter according to claim 1, wherein the 950 MHZ-2150 MHZ filter-amplifier driver further comprises: a power conversion circuit and a 13V/18V power switching circuit; the power supply conversion circuit is used for converting an input 13V voltage into a 5V or 18V voltage, and the 13V/18V power supply switching circuit is used for providing a +13V or +18V voltage for the LNB head.

8. The high-compatibility dual 1550nm laser transmitter according to claim 1, wherein the first laser is a DWDM laser and the second laser is a coolerless laser.