Optical signal conversion into electrical signal multi-signal satellite signal transmission optical receiver

Abstract

The application discloses a kind of optical signal conversion into electrical signal multi-signal satellite signal transmission optical receiver, belong to optical fiber communication and broadcast television technical field;The optical receiver includes: optical receiving detector, for receiving containing multiple different wavelength satellite intermediate frequency signal optical signal and a ground television signal optical signal;Photoelectric conversion circuit, for demultiplexing and respectively converting each optical signal into electrical signal;Automatic gain control circuit, for maintaining output level stable when input optical power changes;Radio frequency amplification circuit, for power amplification to electrical signal;Multiple signal output interfaces, for respectively outputting satellite intermediate frequency signal and ground television signal;And power module;The application realizes the parallel reception and output of single machine integration 8 satellite intermediate frequency signals and 1 ground television signal, with wide frequency band coverage, output stable, good compatibility, support up to 50 kilometers optical fiber transmission and the like advantages, can simplify network structure, reduce operating cost.

Description

Technical Field

[0001] This invention belongs to the field of optical fiber communication and broadcasting technology, specifically relating to an optical receiver for multi-signal satellite signal transmission that converts optical signals into electrical signals. Background Technology

[0002] In existing hybrid cable television and satellite communication networks, separate optical receivers are typically deployed to process terrestrial broadcast signals and satellite intermediate frequency (IF) signals. This architecture leads to an increase in network node equipment, complex cabling, and higher maintenance costs. Although existing coarse wavelength division multiplexing (CWDM) technology can multiplex multiple optical signals of different wavelengths in the same optical fiber, the integration of processing multiple (e.g., 8) satellite IF signals and one terrestrial television signal simultaneously on a single receiver is still insufficient, making it difficult to meet the needs of high-density user access.

[0003] In addition, the existing equipment has a narrow optical power adaptability range, the output level is unstable when the input optical power fluctuates, and the output interface has poor compatibility with general satellite multiplexers, which increases the difficulty of system integration. Summary of the Invention

[0004] This invention aims to solve the problems of separate reception of satellite and terrestrial signals, low integration, and narrow optical power adaptability in existing technologies. It provides a highly integrated, multi-wavelength compatible optical receiver that enables parallel reception and output of multiple satellite intermediate frequency signals and one terrestrial television signal on the same device, simplifying network structure and reducing operating costs.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: An optical receiver for multi-signal satellite signal transmission that converts optical signals into electrical signals includes: An optical receiver detector is used to receive multiplexed optical signals from an optical fiber, the multiplexed optical signals including multiple satellite intermediate frequency optical signals of different wavelengths and one terrestrial television signal optical signal; A photoelectric conversion circuit is used to demultiplex the multiplexed optical signals and convert each optical signal into a corresponding electrical signal. An automatic gain control circuit, connected to the output of the photoelectric conversion circuit, is used to control the gain of the converted electrical signal to maintain the stability of the output level when the input optical power changes. The radio frequency amplifier circuit is connected to the output terminal of the automatic gain control circuit and is used to amplify the power of the electrical signal after gain control. Multiple signal output interfaces are connected to the output terminal of the radio frequency amplifier circuit to output the processed satellite intermediate frequency signal and terrestrial television signal respectively. The power module is used to receive 18V to 20V DC power and provide operating voltage for the optical receiver detector, photoelectric conversion circuit, automatic gain control circuit and radio frequency amplifier circuit.

[0006] Furthermore, the satellite intermediate frequency optical signal has eight channels with wavelengths of 1330nm, 1350nm, 1370nm, 1390nm, 1510nm, 1530nm, 1550nm and 1570nm respectively.

[0007] Furthermore, the optical receiver's automatic gain control maintains a stable output level within a range of -7dBm to +2dBm; the optical receiver... It can operate stably with an optical input range of -14dBm to +3dBm.

[0008] Furthermore, the satellite intermediate frequency signal output frequency range after processing by the radio frequency amplification circuit is 950MHz to 2150MHz, and the output level is stabilized at 84dBμV under automatic gain control; the processed terrestrial television signal output frequency range is 47MHz to 860MHz, and the output level is stabilized at 82dBμV under automatic gain control.

[0009] Furthermore, the plurality of signal output interfaces include a plurality of satellite intermediate frequency signal output interfaces corresponding one-to-one with the number of satellite intermediate frequency optical signal channels, and a terrestrial television signal output interface; the satellite intermediate frequency signal output interface is configured to be directly connected to the input terminal of the 9IN series satellite multiplexer.

[0010] Further, the power supply module includes: a chip US8, having an input pin IN, a bootstrap pin BS, a switch pin SW, a feedback pin FB, a current setting pin ISET, a compensation pin COMP, and a ground pin GND; the input terminal VIN is connected to the anode of diode D24, the cathode of diode D24 is connected to the cathode of transient voltage suppression diode SMBJ24A, the first terminal of the first capacitor C313, and the input pin IN; the anode of the transient voltage suppression diode SMBJ24A and the second terminal of the first capacitor C313 are grounded; the bootstrap pin BS is connected to the switch pin SW through a second capacitor C309; the switch pin SW is connected to the first terminal of inductor L85, and the second terminal of inductor L85 serves as the output terminal VOUT, used to power the optical receiving and conversion module, the automatic gain control circuit, and the transmitter. The frequency amplifier circuit provides the operating voltage; the output terminal VOUT is connected to the first terminal of the third capacitor C314, the first terminal of the fourth capacitor C315, and the first terminal of the first resistor R283; the second terminals of the third capacitor C314 and the fourth capacitor C315 are grounded; the second terminal of the first resistor R283 is connected to the feedback pin FB and the first terminal of the second resistor R286, and the second terminal of the second resistor R286 is grounded; the feedback pin FB is also grounded through the third capacitor 10nF; the compensation pin COMP is grounded through the series branch of the third resistor R285 and the fourth capacitor C316; the current setting pin ISET is grounded through the fourth resistor R284; the output terminal VOUT is also connected to the anode of multiple light-emitting diodes LED0 to LED9 through the fifth resistor R281, and the cathodes of the multiple light-emitting diodes are grounded.

[0011] Furthermore, the radio frequency amplifier circuit includes two independent signal amplification paths: the first amplification path is used to process the satellite intermediate frequency signal, with a passband of 950 to 2150 MHz; the second amplification path is used to process the terrestrial television signal, with a passband of 47 to 860 MHz.

[0012] Furthermore, the optical receiver detector is configured to support fiber optic transmission distances of up to 50 kilometers.

[0013] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects: This invention discloses an optical receiver for multi-signal satellite signal transmission, which converts optical signals into electrical signals. It comprises an optical receiver detector, a photoelectric conversion circuit, an automatic gain control circuit, an RF amplifier circuit, and a power supply module. This invention integrates the reception and processing of eight satellite intermediate frequency (IF) signals and one terrestrial television signal, saving equipment room space and simplifying network cabling. The satellite IF signal output covers the entire 950-2150MHz frequency band, and the terrestrial television signal covers 47-860MHz, compatible with various existing terminals. It features wide-range optical AGC control (-7dBm to +2dBm). Under input optical power fluctuations of -14dBm to +3dBm, the satellite intermediate frequency signal output level remains stable at 82dBμV, and the terrestrial television signal output level remains stable at 82dBuV, ensuring signal quality. The satellite intermediate frequency signal output interface and the terrestrial television signal output interface can be directly connected to the 9IN series satellite multiplexer, facilitating system upgrades and expansions. It supports fiber optic transmission up to 50 kilometers, with low fiber optic cable costs. It integrates a high-efficiency step-down converter circuit, with a stable output of 18-20V DC input, and features transient voltage suppression and status indication functions. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of a multi-signal satellite signal transmission optical receiver that converts optical signals into electrical signals according to the present invention; Figure 2 This is a schematic diagram of the external structure of an optical receiver for multi-signal satellite signal transmission that converts optical signals into electrical signals according to the present invention; Figure 3 This is a schematic diagram (I) of the internal structure of an optical receiver for multi-signal satellite signal transmission that converts optical signals into electrical signals according to the present invention. Figure 4 This is a schematic diagram (II) of the internal structure of an optical receiver for multi-signal satellite signal transmission that converts optical signals into electrical signals according to the present invention. Figure 5 This is a circuit diagram of a power supply module for a multi-signal satellite signal transmission optical receiver that converts optical signals into electrical signals according to the present invention. Detailed Implementation

[0015] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings: The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. The present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. The purpose and effects of the present invention will become clearer. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0016] like Figures 1 to 5 As shown, a multi-signal satellite signal transmission optical receiver that converts optical signals into electrical signals is described, such as... Figure 1 As shown, it includes: An optical receiver detector is used to receive multiplexed optical signals from an optical fiber, the multiplexed optical signals including multiple satellite intermediate frequency optical signals of different wavelengths and one terrestrial television signal optical signal; A photoelectric conversion circuit is used to demultiplex the multiplexed optical signals and convert each optical signal into a corresponding electrical signal. An automatic gain control circuit, connected to the output of the photoelectric conversion circuit, is used to control the gain of the converted electrical signal to maintain the stability of the output level when the input optical power changes. The radio frequency amplifier circuit is connected to the output terminal of the automatic gain control circuit and is used to amplify the power of the electrical signal after gain control. Multiple signal output interfaces are connected to the output terminal of the radio frequency amplifier circuit to output the processed satellite intermediate frequency signal and terrestrial television signal respectively. The power module is used to receive 18V to 20V DC power and provide operating voltage for the optical receiver detector, photoelectric conversion circuit, automatic gain control circuit and radio frequency amplifier circuit.

[0017] The satellite intermediate frequency optical signal has eight channels with wavelengths of 1330nm, 1350nm, 1370nm, 1390nm, 1510nm, 1530nm, 1550nm and 1570nm respectively.

[0018] The optical receiver's automatic gain control maintains a stable output level within a range of -7dBm to +2dBm; the optical receiver It can operate stably with an optical input range of -14dBm to +3dBm. The satellite intermediate frequency signal output frequency range after processing by the radio frequency amplifier circuit is 950MHz to 2150MHz, and the output level is stable at 84dBμV under automatic gain control; the terrestrial television signal output frequency range after processing is 47MHz to 860MHz, and the output level is stable at 82dBμV under automatic gain control.

[0019] The plurality of signal output interfaces include a plurality of satellite intermediate frequency signal output interfaces corresponding one-to-one with the number of satellite intermediate frequency optical signal channels, and a terrestrial television signal output interface; the satellite intermediate frequency signal output interface and the terrestrial television signal are configured to be directly connected to the input terminal of the 9IN series satellite multiplexer.

[0020] The multiplexed optical signal from the optical fiber enters the photoelectric conversion circuit via the optical power input interface. The CWDM circuit within this circuit demultiplexes the multiplexed optical signal according to wavelength, resulting in eight satellite intermediate frequency (IF) optical signals and one terrestrial television (TTV) optical signal. The wavelengths of the eight satellite IF optical signals are 1330nm, 1350nm, 1370nm, 1390nm, 1510nm, 1530nm, 1550nm, and 1570nm, respectively; the wavelength of the TTV optical signal uses the standard CWDM wavelength (e.g., 1550nm). Each optical signal is then converted into an electrical signal by its corresponding photodetector.

[0021] The converted electrical signal is fed into the automatic gain control (AGC) circuit. This AGC circuit has an optical power automatic gain control range of -7dBm to +2dBm, ensuring a stable output level when the input optical power varies within this range. The signal output from the AGC circuit then enters the radio frequency (RF) amplifier circuit. The RF amplifier circuit contains two independent signal amplification paths: the first amplification path has a passband of 950 to 2150MHz and is used to amplify the satellite intermediate frequency (IF) signal; the second amplification path has a passband of 47 to 860MHz and is used to amplify the terrestrial television signal. After amplification, the satellite IF signal level is stabilized at 84dBμV, and the terrestrial television signal level is stabilized at 82dBuV.

[0022] The amplified satellite intermediate frequency (IF) signal and terrestrial television (TTV) signal are output through their respective satellite IF signal output interface and TTV signal output interface. The satellite IF signal and TTV signal output interfaces use F-type female connectors, which can be directly connected to the input terminals of the 9IN series satellite multiplexer to achieve signal multiplexing.

[0023] like Figure 2 The diagram shows the power module circuit. The power module receives an external 18V-20V DC power supply, providing the necessary operating voltage for the photoelectric conversion circuit, automatic gain control circuit, and RF amplifier circuit. In this embodiment, the power module uses a buck converter circuit, and the specific connection relationship is as follows: The US8 chip has an input pin IN, a bootstrap pin BS, a switch pin SW, a feedback pin FB, a current setting pin ISET, a compensation pin COMP, and a ground pin GND. The input pin VIN is connected to the anode of diode D24. The cathode of diode D24 is connected to the cathode of transient voltage suppressor diode SMBJ24A, the first terminal of the first capacitor C313, and the input pin IN; the anode of SMBJ24A and the second terminal of C313 are grounded. The bootstrap pin BS is connected to the switch pin SW through the second capacitor C309. The switch pin SW is connected to the first terminal of inductor L85, and the second terminal of inductor L85 serves as the output pin VOUT, powering each module. The output pin VOUT is connected to the first terminal of the third capacitor C314, the first terminal of the fourth capacitor C315, and the first terminal of the first resistor R283; the second terminals of C314 and C315 are grounded; the second terminal of R283 is connected to the feedback pin FB and the first terminal of the second resistor R286, the second terminal of R286 is grounded; the feedback pin FB is also grounded through a 10nF third capacitor. The compensation pin COMP is grounded through a series branch of the third resistor R285 and the fourth capacitor C316. The current setting pin ISET is grounded through the fourth resistor R284. The output VOUT is also connected to the anodes of multiple LEDs LED0 through LED9 through the fifth resistor R281. The cathodes of these LEDs are grounded and used as a power status indicator.

[0024] like Figure 3 As shown, the external structure of the optical receiver of the present invention includes: an optical power input interface for connecting optical fiber; multiple satellite intermediate frequency signal output interfaces, eight in this embodiment; a terrestrial television signal output interface; and an 18V to 20V power input interface.

[0025] like Figure 4 and Figure 5 As shown, the optical receiver internally includes a power supply module, a photoelectric conversion circuit, an automatic gain control circuit, and an RF amplifier circuit. The photoelectric conversion circuit integrates a coarse wavelength division multiplexer (CWDM) and a photodetector array.

[0026] The multiplexed optical signal from the optical fiber enters the photoelectric conversion circuit via the optical power input interface. The CWDM circuit within this circuit demultiplexes the multiplexed optical signal according to wavelength into eight satellite intermediate frequency (IF) optical signals (wavelengths of 1330nm, 1350nm, 1370nm, 1390nm, 1510nm, 1530nm, 1550nm, and 1570nm, respectively) and one terrestrial television signal optical signal. Each optical signal is then converted into an electrical signal by its corresponding photodetector.

[0027] The converted electrical signal is fed into the automatic gain control (AGC) circuit. This AGC circuit has an optical power control range of -7dBm to +2dBm, ensuring a stable output level when the input optical power varies within this range. The signal output from the AGC circuit then enters the radio frequency (RF) amplifier circuit. The RF amplifier circuit contains two independent amplification paths: the first path has a passband of 950-2150MHz and is used to amplify the satellite intermediate frequency (IF) signal; the second path has a passband of 47-860MHz and is used to amplify the terrestrial television signal. The amplified satellite IF signal level is stabilized at 84dBμV, and the terrestrial television signal level is stabilized at 82dBμV.

[0028] The amplified signals are output through the corresponding satellite intermediate frequency (IF) signal output interface and terrestrial television signal output interface, respectively. The satellite IF signal and television signal output interfaces use F-type female connectors, which can be directly connected to the input terminals of the 9IN series satellite multiplexer to achieve signal multiplexing.

[0029] By selecting low-loss optical fiber and appropriate optical transmission power, this optical receiver supports optical fiber transmission distances of up to 50 kilometers, meeting the needs of long-distance signal distribution.

[0030] Those skilled in the art should understand that the number of satellite intermediate frequency (IF) signals is not limited to 8 channels, and can be designed as 4 channels, 16 channels, etc., according to actual needs; the wavelength can also be adjusted according to the CWDM standard. The specific control range and output level of the AGC circuit can be optimized according to the application scenario. The buck converter circuit in the power supply module can also adopt other topologies, such as using different switching power supply chips, as long as the same DC-DC conversion function is achieved. The casing can be made of metal to provide electromagnetic shielding and is equipped with status indicator lights and heat dissipation structures. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this invention should be included within the protection scope of this invention.

[0031] It will be understood by those skilled in the art that the above descriptions are merely preferred examples of the invention and are not intended to limit the invention. Although the invention has been described in detail with reference to the foregoing examples, those skilled in the art can still modify the technical solutions described in the foregoing examples or make equivalent substitutions for some of the technical features. All modifications and equivalent substitutions made within the spirit and principles of the invention should be included within the scope of protection of the invention. All technical features in this embodiment can be freely combined according to actual needs.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-signal satellite signal transmission optical receiver that converts optical signals into electrical signals, characterized in that, Includes a photodetector, photoelectric conversion circuit, automatic gain control circuit, radio frequency amplifier circuit, and multiple signal output interfaces: Among them, the optical receiver detector is used to receive multiplexed optical signals from the optical fiber, the multiplexed optical signals including multiple satellite intermediate frequency optical signals of different wavelengths and one terrestrial television signal optical signal; A photoelectric conversion circuit is used to demultiplex the multiplexed optical signals and convert each optical signal into a corresponding electrical signal. An automatic gain control circuit, connected to the output of the photoelectric conversion circuit, is used to control the gain of the converted electrical signal to maintain the stability of the output level when the input optical power changes. The radio frequency amplifier circuit is connected to the output terminal of the automatic gain control circuit and is used to amplify the power of the electrical signal after gain control. Multiple signal output interfaces are connected to the output terminal of the radio frequency amplifier circuit to output the processed satellite intermediate frequency signals respectively. The power module is used to receive 18V to 20V DC power and provide operating voltage for the optical receiver detector, photoelectric conversion circuit, automatic gain control circuit and radio frequency amplifier circuit.

2. The optical signal to electrical signal multi-signal satellite signal transmission optical receiver according to claim 1, characterized in that, The satellite intermediate frequency optical signal has eight channels with wavelengths of 1330nm, 1350nm, 1370nm, 1390nm, 1510nm, 1530nm, 1550nm and 1570nm respectively.

3. The optical signal to electrical signal multi-signal satellite signal transmission optical receiver according to claim 1, characterized in that, The optical receiver's automatic gain control ranges from -7dBm to +2dBm, ensuring stable output levels; the optical receiver's optical power input ranges from -14dBm to =3dBm, enabling stable operation.

4. The optical signal to electrical signal multi-signal satellite signal transmission optical receiver according to claim 1, characterized in that, The satellite intermediate frequency signal output frequency range after processing by the radio frequency amplifier circuit is 950MHz to 2150MHz, and the output level is stable at 84dBμV under automatic gain control; the terrestrial television signal output frequency range after processing is 47MHz to 860MHz, and the output level is stable at 82dBμV under automatic gain control.

5. The optical signal to electrical signal multi-signal satellite signal transmission optical receiver according to claim 1, characterized in that, The plurality of signal output interfaces include a plurality of satellite intermediate frequency signal output interfaces corresponding one-to-one with the number of wavelengths of the satellite intermediate frequency optical signal, and a terrestrial television signal output interface; the satellite intermediate frequency signal and terrestrial television signal output interfaces are configured to be directly connected to the input terminal of the 9 IN series satellite multiplexer.

6. The optical signal to electrical signal multi-signal satellite signal transmission optical receiver according to claim 1, characterized in that, The power supply module includes: a chip US8 with an input pin IN, a bootstrap pin BS, a switch pin SW, a feedback pin FB, a current setting pin ISET, a compensation pin COMP, and a ground pin GND; the input terminal VIN is connected to the anode of diode D24, the cathode of diode D24 is connected to the cathode of transient voltage suppression diode SMBJ24A, the first terminal of the first capacitor C313, and the input pin IN; the anode of the transient voltage suppression diode SMBJ24A and the second terminal of the first capacitor C313 are grounded; the bootstrap pin BS is connected to the switch pin SW through a second capacitor C309; the switch pin SW is connected to the first terminal of inductor L85, and the second terminal of inductor L85 serves as the output terminal VOUT, used to power the optical receiving and conversion module, the automatic gain control circuit, and the RF amplifier. The main circuit provides the operating voltage; the output terminal VOUT is connected to the first terminal of the third capacitor C314, the first terminal of the fourth capacitor C315, and the first terminal of the first resistor R283; the second terminals of the third capacitor C314 and the fourth capacitor C315 are grounded; the second terminal of the first resistor R283 is connected to the first terminal of the feedback pin FB and the second resistor R286, and the second terminal of the second resistor R286 is grounded; the feedback pin FB is also grounded through the third capacitor 10nF; the compensation pin COMP is grounded through the series branch of the third resistor R285 and the fourth capacitor C316; the current setting pin ISET is grounded through the fourth resistor R284; the output terminal VOUT is also connected to the anode of multiple light-emitting diodes LED0 to LED9 through the fifth resistor R281, and the cathodes of the multiple light-emitting diodes are grounded.

7. The optical signal to electrical signal multi-signal satellite signal transmission optical receiver according to claim 1, characterized in that, The radio frequency amplifier circuit includes two independent signal amplification paths: the first amplification path is used to process the satellite intermediate frequency signal, with a passband of 950-2150MHz; the second amplification path is used to process the terrestrial television signal, with a passband of 47-860MHz.

8. The optical signal to electrical signal multi-signal satellite signal transmission optical receiver according to claim 1, characterized in that, The optical receiver detector is configured to support fiber optic transmission distances of up to 50 kilometers.

Images