CN2660826Y - Gained digital code regulating optical fiber RF modular - Google Patents
Gained digital code regulating optical fiber RF modular Download PDFInfo
- Publication number
- CN2660826Y CN2660826Y CNU2003201173594U CN200320117359U CN2660826Y CN 2660826 Y CN2660826 Y CN 2660826Y CN U2003201173594 U CNU2003201173594 U CN U2003201173594U CN 200320117359 U CN200320117359 U CN 200320117359U CN 2660826 Y CN2660826 Y CN 2660826Y
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- optical fiber
- radio
- gaining
- gain
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Abstract
A gaining digital adjustable optical-fiber radio-frequency modular can perform the analog dual transmission of the radio-frequency signal through the optical fiber. The electric signal radio-frequently input is inserted with the FSK management signal after passing through a gaining fixed attenuation network, then the signal is sent into a laser LD to be transformed into an optical signal and the optical signal is transmitted to the far end through the optical fiber. The receiving optical-electrical diode PD at the far end transforms the received optical signal to be the electric signal, the electric signal is sent into a gaining digital adjusting network to be appropriately adjusted and amplified to be the radio-frequency signal, and then the radio-frequency signal is output; meanwhile, the FSK management signal is extracted to be processed. The gaining digital adjusting part is shown as the attached picture in the abstract. The electric signal output from PD (11) is sent to a gaining digital integration circuit (15) controlled by the dialed number switch (17) after amplified at the first level (16), the signal is output through the fixed attenuation network (14) and the second-level amplification circuit (13). The required gaining can be determined on the spot, which overcomes the inconvenience of the original analog adjusting gaining.
Description
Affiliated technical field
The utility model relates to the optical fiber radio-frequency module of high-frequency signal with the analog form transmission, is applied to the optical fiber RF direct amplifying station of field of mobile communication.
Background technology
At present, the optical fiber radio-frequency module of optical fiber repeater field application is used for the conversion between optical fiber repeater light signal and the rf signal.Be divided into single fiber and two fine by the signal transmission form in the optical fiber, Fig. 1 is that single fiber optical fiber radio-frequency module is formed schematic diagram, and Fig. 2 is that two fine optical fiber radio-frequency modules are formed schematic diagram.If fiber resource is relatively more nervous, use simple optical fiber, at this moment transmitted in both directions uses single fiber optical fiber radio-frequency module, and module comprises the optical coupler of light input/output signal; If two optical fiber are arranged, at this moment every optical fiber one-way transmission uses two fine optical fiber radio-frequency modules, and module does not need optical coupler.The optical fiber radio-frequency module uses in pairs, and base station side and repeater side are respectively put one.Be that example illustrates with single fiber optical fiber radio-frequency module earlier, in Fig. 1, by the next downlink radio frequency signal of telecommunication in mobile base station, deliver to local module rf inputs (1) by the radio frequency cable line that links to each other with the optical fiber radio-frequency module, behind the fixed attenuation that the gains network (2), deliver to laser LD (4), LD realizes that rf signal is converted to light signal, the bias current that laser LD (4) received power control simultaneously and temperature-control circuit are come, light signal is sent to photosynthetic road part (7) then, deliver to the light input/output port mouth that links to each other with external fiber at last, be transmitted through the fiber to far-end.
The light signal that the optical fiber radio-frequency module of far-end is received light input/output port mouth (6) is delivered to optical coupler (7), deliver to again and receive photodiode PD (11), PD converts light signal to rf signal, and through the digital part (10) of regulating of gain, suitably amplify, power attenuation and the setting whole system brought with compensation photoelectricity and electric light conversion gain, deliver to the radiofrequency signal output port (9) that links to each other with module-external radio frequency cable line then, deliver to the repeater amplifier of module-external through the radio frequency cable line, launch by antenna.Otherwise, send into the optical fiber radio-frequency module by the up radiofrequency signal that discharging-directly station antenna is received through amplifier, by optical fiber signal is delivered to the optical fiber radio-frequency module of base station end then, thereby constitute the direct discharging station of optical fiber as transmission medium.
In two fine optical fiber radio-frequency modules, do not contain photosynthetic road part, remainder is identical.
FSK circuit in the optical fiber radio-frequency module is in order to realize the transmission of the management information between repeater and the base station, the low frequency electrical signal conversion that comprises management information that FSK transtation mission circuit (5) is sent module-external here becomes rf signal to deliver to laser LD, go out with the main signal of introducing above, distinguished by different frequencies, generally low than the main signal frequency.FSK receiving circuit (12) converts the radiofrequency signal that comprises management information that reception diode PD receives to the low frequency signal of telecommunication, delivers to module-external, has realized the transmission of management information like this between repeater and the base station by the optical fiber radio-frequency module.
LD in the optical fiber radio-frequency module and PD monitoring alarm circuit (8) are used to monitor bias current and the fault alarm of laser LD, monitoring PD light intensity and unglazed or low light level alarm, and corresponding output pin and indicator light indication are arranged.
Existing application all adopts adjustable potentiometer in the Gain Adjustable part (10) of the optical fiber radio-frequency module of optical fiber RF direct amplifying station, adopts the voltage-controlled mode of simulation to come ride gain by integrated circuit.Need contrast instrument when regulating gain and debug repeatedly, very inconvenient, especially at engineering site.
Summary of the invention
The digital implementation of a kind of new gain has been advised in accurately debugging gain of user scene for convenience, the utility model, and is very clear to the scope and the degree of gain-adjusted.
The technical scheme that its technical problem that solves the utility model adopts is:
The digital part (10) of regulating of gain is made up of radio frequency amplifying circuit, fixed attenuation network, the digital integrated circuit that gains, plucking number sign switch in the drawings.Photodiode PD is converted to the signal of telecommunication with light signal, send into the digital part of regulating of gain, amplify through the first order, deliver to the digital integrated circuit of the gain that is subjected to plucking number sign switch control, pass through the fixed attenuation network again through signal behind the adjustable damping, with adjustable gain scope of regulating whole link and the standing wave coupling that realizes necessity, output after second level radio frequency amplifies again.We adopt plucking number sign switch to control the dedicated numerical control integrated circuit, realize pulling out the fixing dB number (as a dB) of one grade of change in gain.The digital integrated circuit model that wherein gains is HMC273MS10G, the control bit of 5 bits is arranged, but can realize 1 to 31dB controlling attenuation.The adjustable potentiometer control integrated circuit is generally used in cancellation, the way of analog regulation gain.
The beneficial effects of the utility model are, by changing the design of Gain Adjustable part, increase the digital regulatory function of gain, greatly made things convenient for the user to set the gain of optical fiber radio-frequency module accurately, rapidly, thereby determine the gain of system, do not need to transfer repeatedly, especially observe and debug extremely inconvenient engineering site, strengthen the competitiveness of product in market by instrument.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is a single fiber optical fiber radio-frequency module organigram of the present utility model.
Fig. 2 is two fine optical fiber radio-frequency module organigrams.
Fig. 3 is the digital part schematic diagram of regulating of gain.
Among the figure 1, the radio frequency input, 2, gain fixed attenuation network, 3, power control and temperature control, 4 laser LD (including isolator and detection PD backlight), 5, FSK transtation mission circuit, 6, the light input and output, 7, photosynthetic road part, 8, LD and PD monitoring alarm circuit, 9, radio frequency output, 10, gain is digital regulates, 11, reception diode PD, 12, FSK receiving circuit, 13, second level radio frequency amplifies, and 14, the fixed attenuation network, 15, digital integrated circuit gains, 16, first order radio frequency amplifies, and 17, plucking number sign switch
If module does not need the FSK function, can not comprise 5 and 12 parts.
Embodiment
Module housing is an aluminium alloy structure, two cavitys of interior part, and radiating portion and receiving unit are divided into two circuit boards, are separately fixed in two cavitys.Electrical interface among Fig. 1 (1) and (9), optical interface (6) is fixed on the shell, and (5), (8) externally are connected by housing side one 9 pin D type head with (12) part, and the indicator light of alarm indication (8) part is fixed on the housing another side.(2), (3), (4) and (12) partial fixing on Power Generation Road, (10), (11) partial fixing are being received on the circuit board, have avoided crosstalking between the transmitting-receiving like this, all high-speed line are walked at circuit board towards the loam cake one side, isolate by cavity.The fine part of fiber reel is placed between housing lower cover and the circuit board, connects with optical fiber between (4), (6), (7) and (11) part, and remainder is that circuit connects.Optical interface is FC/PC or FC/APC joint, and radio frequency interface is a sub-miniature A connector, and control pin and fsk signal interface are the DB9 joint.
Gain is digital regulates part (10) as shown in Figure 3, the PD of receiving optical signals (11), send into the input that first order radio frequency amplifies (16) after being converted to the signal of telecommunication, output connects gain digital integrated circuit (15) input, and the plucking number sign switch (17) that is connected with this integrated circuit control pin can be provided with the decay numerical value of gain.The signal of this integrated circuit output passes through fixed attenuation network (14) again, with the adjustable range and the realization standing wave coupling of regulating gain integrated circuit (15), delivers to radio frequency output interface (9) after second level radio frequency amplifying circuit (13) amplifies.
Claims (2)
1. the optical fiber radio-frequency module of a Gain Adjustable is converted to light signal with radiofrequency signal, simulates transmitted in both directions by optical fiber, optional FSK management channel.It is characterized in that: adopt plucking number sign switch and the digital integrated circuit of gain, cooperate fixed attenuation circuit and radio frequency amplifying circuit, accurately set the needed gain of optical fiber radio-frequency module, do not need the scene to observe with instrument and debugging gain repeatedly.The digital integrated circuit model that wherein gains is HMC273MS10G, the control bit of 5 bits is arranged, but can realize 1 to 31dB controlling attenuation.
2. optical fiber radio-frequency module according to claim 1, it is characterized in that: physically independent and integrated fully between the transmitting-receiving cavity, the transmission circuit plate is a two boards, realizes being electrically connected by the perforation lead-in wire between the circuit board, farthest increase isolation, avoid the interference between the transmission circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201173594U CN2660826Y (en) | 2003-10-21 | 2003-10-21 | Gained digital code regulating optical fiber RF modular |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2003201173594U CN2660826Y (en) | 2003-10-21 | 2003-10-21 | Gained digital code regulating optical fiber RF modular |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2660826Y true CN2660826Y (en) | 2004-12-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2003201173594U Expired - Fee Related CN2660826Y (en) | 2003-10-21 | 2003-10-21 | Gained digital code regulating optical fiber RF modular |
Country Status (1)
| Country | Link |
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| CN (1) | CN2660826Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957478A (en) * | 2011-08-19 | 2013-03-06 | 深圳光启高等理工研究院 | Radio frequency control lighting light source based visible light wireless communication system |
-
2003
- 2003-10-21 CN CNU2003201173594U patent/CN2660826Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957478A (en) * | 2011-08-19 | 2013-03-06 | 深圳光启高等理工研究院 | Radio frequency control lighting light source based visible light wireless communication system |
| CN102957478B (en) * | 2011-08-19 | 2014-12-24 | 深圳光启高等理工研究院 | Radio frequency control lighting light source based visible light wireless communication system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |