CN110753211A - Optical AGC type electric dimming receiver - Google Patents
Optical AGC type electric dimming receiver Download PDFInfo
- Publication number
- CN110753211A CN110753211A CN201911097341.4A CN201911097341A CN110753211A CN 110753211 A CN110753211 A CN 110753211A CN 201911097341 A CN201911097341 A CN 201911097341A CN 110753211 A CN110753211 A CN 110753211A
- Authority
- CN
- China
- Prior art keywords
- amplifier
- unit
- optical
- optical splitter
- agc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
Abstract
The invention aims to provide an optical AGC type electric dimming receiver which is simple in structure, convenient to use, low in cost and stable in reliability. The optical receiving unit, the AGC adjusting unit, the electric tuning equalizing unit, the amplifier II, the electric tuning equalizing unit, the electric tuning attenuation unit, the amplifier III, the amplifier IV, the optical splitter I, the optical splitter II and the RF test point are sequentially connected, the optical receiving unit, the amplifier I, the AGC adjusting unit, the amplifier II, the electric tuning equalizing unit, the electric tuning attenuation unit, the amplifier III, the amplifier IV, the optical splitter I and the optical splitter II are respectively connected, the output end of the optical splitter II is connected with the RF test point, and the output end of the optical splitter II is also connected with an output interface. The invention is applied to the technical field of optical receivers.
Description
Technical Field
The invention is applied to the technical field of optical receivers, and particularly relates to an optical AGC type electric dimming receiver.
Background
The electric dimming receiver with the optical AGC function is used for converting an optical signal into a radio frequency signal after a television signal of a main network is transmitted through an optical fiber and then distributing the radio frequency signal to a branch network. The traditional CATV broadcast distribution network, along with the transformation of hybrid network (i.e. HFC network) combining optical fiber and coaxial cable, develops into communication type bidirectional interconnection network, and the optical fiber network and passive cable distribution network will be the dominant mode of HFC network architecture.
The method has obvious characteristics from the current HFC network development situation: the optical fiber users are gradually extended, the service radius of the optical junction is smaller and smaller, the number of bidirectional users is increased gradually, the application of the RF amplifier is less and less, the RF amplifier is generally used within the second level, and the network reliability after the optical junction is greatly improved. As the quality of service requirements of subscribers increase, the optical junction will eventually be a passive distribution network, with the optical receiving device providing a high level output signal to cover the subscribers around the junction.
The existing optical receiver generally comprises a photoelectric conversion detector, an optical power indicator lamp, an amplifier, an attenuator circuit and an equalizer circuit. In the prior art, the phenomenon that the output level is unstable along with the change of the input optical power and the technical problems of large CTB and CSO changes exist. Therefore, whether to keep the output level of the high index constant in each case to the subscriber side, and whether the CTB and CSO change little will be the key of the optical receiving apparatus. Chinese patent CN204334589U discloses an optical AGC type optical receiver, which realizes that the output level remains unchanged and the CTB and CSO change little when the input optical power changes within a certain range, but the patent does not have a feedback function, is difficult to realize the self-regulation of the system in the using process, and has unstable reliability.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art and provide an optical AGC type electric dimming receiver which has the advantages of simple structure, convenient use, low cost and stable reliability.
The technical scheme adopted by the invention is as follows: the optical fiber amplifier comprises a CPU unit, an optical receiving unit, a first amplifier, an AGC adjusting unit, a second amplifier, an electric regulation equalizing unit, an electric regulation attenuation unit, a third amplifier, a fourth amplifier, a first optical splitter, a second optical splitter and an RF test point, wherein the optical receiving unit, the first amplifier, the AGC adjusting unit, the second amplifier, the electric regulation equalizing unit, the electric regulation attenuation unit, the third amplifier, the fourth amplifier, the first optical splitter and the second optical splitter are sequentially connected, the optical receiving unit, the AGC adjusting unit, the electric regulation equalizing unit, the electric regulation attenuation unit and the first optical splitter are respectively connected with the CPU unit, the output end of the second optical splitter is connected with the RF test point, and the output end of the second optical splitter is further connected with an output interface.
Further, the system also comprises a display unit, and the display unit is connected with the CPU unit.
Further, it also comprises a transponder, which is connected to the CPU unit.
Further, the number of the output interfaces is two.
Further, the first amplifier, the second amplifier, the third amplifier and the fourth amplifier are all gallium arsenide amplifying modules.
The invention has the beneficial effects that: the optical fiber coupler adopts a structure comprising a CPU unit, an optical receiving unit, a first amplifier, an AGC adjusting unit, a second amplifier, an electric regulation equalizing unit, an electric regulation attenuating unit, a third amplifier, a fourth amplifier, a first optical splitter, a second optical splitter and an RF test point, wherein the optical receiving unit, the first amplifier, the AGC adjusting unit, the second amplifier, the electric regulation equalizing unit, the electric regulation attenuating unit, the third amplifier, the fourth amplifier, the first optical splitter and the second optical splitter are sequentially connected, the optical receiving unit, the AGC adjusting unit, the electric regulation equalizing unit, the electric regulation attenuating unit and the first optical splitter are respectively connected with the CPU unit, the output end of the second optical splitter is connected with the RF test point, and the output end of the second optical splitter is further connected with an output interface. Compared with the closest prior art, the invention has the following advantages: in the invention, the input end of the light receiving unit is connected with the optical signal through the optical fiber, when the optical signal enters, the light receiving unit has the optical signal with optical power of each grade of-7 dBm to +2dBm, and converting the optical signal into radio frequency signal, making the output level of the design always keep constant output under the control of CPU unit, finally amplifying the output signal by each amplifier to output interface and providing it to client, meanwhile, the electrical regulation can be realized through the control of the CPU unit to adjust the output level and the slope so as to meet the requirements of users, therefore, the optical signal adjusting device is simple in overall structure and low in cost, the light signals are adjusted by the AGC adjusting unit, the electric adjusting equalizing unit and the electric adjusting attenuation unit which are controlled and connected by the CPU unit, the use is convenient, the optical splitter I is connected with the CPU unit to feed back the information of the light signals, and the CPU unit controls and adjusts other components, so that the optical signal adjusting device has stable reliability.
Drawings
Fig. 1 is a block diagram of the circuit structure of the present invention.
Detailed Description
As shown in fig. 1, in this embodiment, the present invention includes a CPU unit 1, an optical receiving unit 2, a first amplifier 3, an AGC adjusting unit 4, a second amplifier 5, an electrically tunable equalizing unit 6, an electrically tunable attenuating unit 7, a third amplifier 8, a fourth amplifier 9, a first optical splitter 10, a second optical splitter 11, and an RF test point 12, wherein the optical receiving unit 2, the first amplifier 3, the AGC adjusting unit 4, the second amplifier 5, the electrically tunable equalizing unit 6, the electrically tunable attenuating unit 7, the third amplifier 8, the fourth amplifier 9, the first optical splitter 10, and the second optical splitter 11 are connected in sequence, the optical receiving unit 2, the AGC adjusting unit 4, the electrically tunable equalizing unit 6, the electrically tunable attenuating unit 7, and the first optical splitter 10 are connected to the CPU unit 1, respectively, an output end of the second optical splitter 11 is connected to the RF test point 12, the output end of the second optical splitter 11 is also connected with an output interface 13. The CPU unit 1 plays a control role in the design, and controls other components to realize the adjustment of optical signals; the optical receiving unit 2 is used for accessing an optical signal, converting the optical signal into a radio frequency signal and sending the radio frequency signal; the first amplifier 3, the second amplifier 5, the third amplifier 8 and the fourth amplifier 9 are all used for amplifying signals and are arranged at different connecting positions, and the strength of the signals is enhanced at different time to form hierarchical amplification; the AGC adjusting unit 4 is an automatic gain control part, can automatically perform gain control on optical signals or radio frequency signals and plays a role in adjusting; the electrically-adjustable equalization unit 6 and the electrically-adjustable attenuation unit 7 are both used for adjusting radio frequency signals, the former adjusts the equalization state of the radio frequency signals, and the latter controls the intensity of the radio frequency signals; the first optical splitter 10 and the second optical splitter 11 are used for connecting different components, wherein the first optical splitter feeds back radio frequency signal information by connecting with the CPU unit 1, the CPU unit 1 reacts according to actual conditions and controls other components to adjust so that the optical power is in a range of-7 to +2dBm, the output level can always keep constant output, and the second optical splitter continues to generate a radio frequency signal to the output interface 13 to complete signal transmission, and the RF test point 13 also tests the finally transmitted radio frequency signal to detect whether the radio frequency signal meets design requirements or not because the second optical splitter 12 is also connected with the RF test point. Therefore, the invention has the advantages of simple integral structure, low cost, convenient use and stable reliability.
In this embodiment, it further comprises a display unit 14, said display unit 14 being connected to said CPU unit 1. The display unit 14 is arranged, so that a user can clearly master the overall working state of the invention, and the use is more convenient.
In this embodiment it further comprises a transponder 15, said transponder 15 being connected to said CPU unit 1. The transponder 15 is used to identify the rf signal and feed the rf signal information back to the CPU unit 1, so as to more fully condition the rf signal.
In this embodiment, the number of the output interfaces 13 is two. The two output interfaces 13 can increase the number of connection points, so that the purpose of using multiple ports is achieved.
In this embodiment, the first amplifier 3, the second amplifier 5, the third amplifier 8, and the fourth amplifier 9 are all gallium arsenide amplifying modules. The gallium arsenide amplifying module with high index is used as an amplifier, and has the advantages of good nonlinear index, low power consumption, good heat dissipation, large function dynamic range, small noise coefficient, strong function gain and the like.
While the embodiments of the present invention have been described in terms of practical embodiments, they are not to be construed as limiting the meaning of the present invention, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present description.
Claims (5)
1. Light AGC type electricity modulation light receiver, including CPU unit (1), light receiving element (2), amplifier one (3), AGC adjusting element (4), amplifier two (5), electricity modulation equalization unit (6), electricity modulation attenuation unit (7), amplifier three (8), amplifier four (9), optical divider one (10), optical divider two (11) and RF test point (12), its characterized in that: the optical receiving unit (2), the first amplifier (3), the AGC adjusting unit (4), the second amplifier (5), the electrically-adjusted equalizing unit (6), the electrically-adjusted attenuating unit (7), the third amplifier (8), the fourth amplifier (9), the first optical splitter (10) and the second optical splitter (11) are sequentially connected, the optical receiving unit (2), the AGC adjusting unit (4), the electrically-adjusted equalizing unit (6), the electrically-adjusted attenuating unit (7) and the first optical splitter (10) are respectively connected with the CPU unit (1), the output end of the second optical splitter (11) is connected with the RF test point (12), and the output end of the second optical splitter (11) is further connected with an output interface (13).
2. An optical AGC type electrical tilt receiver according to claim 1, characterized in that: it also comprises a display unit (14), the display unit (14) being connected to the CPU unit (1).
3. An optical AGC type electrical tilt receiver according to claim 1, characterized in that: it also comprises a transponder (15), said transponder (15) being connected to said CPU unit (1).
4. An optical AGC type electrical tilt receiver according to claim 1, characterized in that: the number of the output interfaces (13) is two.
5. An optical AGC type electrical tilt receiver according to claim 1, characterized in that: the first amplifier (3), the second amplifier (5), the third amplifier (8) and the fourth amplifier (9) are all gallium arsenide amplification modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911097341.4A CN110753211A (en) | 2019-11-12 | 2019-11-12 | Optical AGC type electric dimming receiver |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911097341.4A CN110753211A (en) | 2019-11-12 | 2019-11-12 | Optical AGC type electric dimming receiver |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110753211A true CN110753211A (en) | 2020-02-04 |
Family
ID=69282903
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911097341.4A Pending CN110753211A (en) | 2019-11-12 | 2019-11-12 | Optical AGC type electric dimming receiver |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110753211A (en) |
-
2019
- 2019-11-12 CN CN201911097341.4A patent/CN110753211A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7434249B2 (en) | FTTH PON that O/E converts 1310 nm for output to transmitters for E/O as 1550 nm | |
| US20030066088A1 (en) | Bidirectional trunk amplifier and cable modem for cable hybrid fiber and coax network which utilizes an upstream pilot signal | |
| JPH1042266A (en) | Catv terminal equipment | |
| US9118424B2 (en) | Optical network unit (ONU) having controllable optical output and method of controlling the optical output of an ONU | |
| CN2810069Y (en) | An optical receiving module for television signals | |
| CN101702634A (en) | Device and method for realizing providing DOCSIS service by radio frequency passive optical network | |
| CN210491075U (en) | Optical AGC type electric dimming receiver | |
| CA2956317C (en) | Hybrid laser anti-clipping for fiber-coaxial networks | |
| CN110753211A (en) | Optical AGC type electric dimming receiver | |
| CN201336666Y (en) | Optical receiver | |
| CN208143224U (en) | A kind of optical network apparatus of integrated PON and RF | |
| CN201266975Y (en) | Optical fiber digital set-top box | |
| WO2023103386A1 (en) | Optical module | |
| CN201263185Y (en) | Optical fiber access television set | |
| CN217789679U (en) | Radio frequency high-bandwidth electric dimming receiver | |
| CN210225422U (en) | Program-controlled adjustable balanced RFoG optical station | |
| CN201515468U (en) | Laser receiving and transmitting integral machine | |
| CN201422142Y (en) | Optical receiver based on wire television optical fiber transmission network | |
| CN201491167U (en) | Novel bidirectional HFC wired network system | |
| KR100630181B1 (en) | Video overlay optical receiver | |
| CN202475432U (en) | Intelligent remote-control optical receiver | |
| CN205336463U (en) | Effectively avoid cable television access network structure that optical beat disturbed in RFoG network | |
| CN213783312U (en) | 1550nm direct dimming transmitter with adjustable dispersion compensation | |
| CN201315587Y (en) | Single-fiber three-dimensional module | |
| CN1719891A (en) | Controllable automatic gain controlling circuit for cable television network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20200204 |
|
| WD01 | Invention patent application deemed withdrawn after publication |