CN201054595Y - CDMA RF optical transmission module - Google Patents
CDMA RF optical transmission module Download PDFInfo
- Publication number
- CN201054595Y CN201054595Y CNU2007200033833U CN200720003383U CN201054595Y CN 201054595 Y CN201054595 Y CN 201054595Y CN U2007200033833 U CNU2007200033833 U CN U2007200033833U CN 200720003383 U CN200720003383 U CN 200720003383U CN 201054595 Y CN201054595 Y CN 201054595Y
- Authority
- CN
- China
- Prior art keywords
- circuit
- radio
- frequency
- optical fiber
- output
- 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.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 claims description 22
- 230000005540 biological transmission Effects 0.000 claims description 21
- 230000007704 transition Effects 0.000 claims description 18
- 238000001914 filtration Methods 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 9
- 230000008878 coupling Effects 0.000 claims description 6
- 238000010168 coupling process Methods 0.000 claims description 6
- 238000005859 coupling reaction Methods 0.000 claims description 6
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 239000011324 bead Substances 0.000 claims description 2
- 239000002184 metal Substances 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 description 7
- 230000001276 controlling effect Effects 0.000 description 5
- 238000013461 design Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 238000012544 monitoring process Methods 0.000 description 5
- 239000003990 capacitor Substances 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010295 mobile communication Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Images
Landscapes
- Optical Communication System (AREA)
Abstract
The utility model provides a CDMA radio-frequency optical transmission module, which comprises a radio-frequency/optical signal transferring component and an optical fiber/radio-frequency signal transferring component. An uplink data signal wire in a repeater station is connected with an input pin of a FSK modulator. The output pin of the FSK modulator is connected with a band-pass filter. The output end of the band-pass filter is connected with a laser device driving circuit. The other downlink data signal line at the output end of a matching magnifying circuit is connected with a band-pass filter circuit, and the output of the band-pass filter circuit is connected with a FSK demodulation circuit to demodulate downlink digital signals. The utility model is capable of effectively preventing the interference during receiving and transmitting, and increasing the isolating degree and the outputted optical power of the laser device. Moreover, the gain of the radio frequency is adjustable.
Description
Technical field
The utility model relates to a kind of CDMA radio-frequency light transmission module, belongs to radio communication transport module field.
Background technology
Along with the development of mobile communication, coverage rate has become most important service indication, and as improving the most effective means of coverage rate, the consumption of optical fiber repeater constantly increases.The Optical Fiber Transmission repeater with compared following advantage with frequently five transmission repeaters and microwave frequency conversion transmission repeater:
1, defeated distance, analog mobile telephone can reach more than the 50km, and digital mobile phone can reach 20km.
2, avoided co-channel interference, but omnidirectional's covering, and addressing is convenient.
3, the signal transmission is not limited by geographical conditions, is particularly suitable for rugged environment.
The core of optical fiber repeater and optical fiber indoor covering system is a radio-frequency light transmission module, and its effect is conversion and the control of finishing light signal box radiofrequency signal, and its quality directly influences the transmission quality and the reliability of optical fiber repeater.
The producer of present domestic professional production radio-frequency light transmission module does not also have moulding, and is external in the majority with the product of Korea S and Israel, but exists the transmission of data signals amount not high, and data-signal monitoring and controlling channels stability is not high, and transmitting-receiving is crosstalked, the high deficiency of cost.
The utility model content
The purpose of this utility model is a kind of transmission of data signals amount height of design, and the data-signal monitoring and controlling channels is stable, and the transmitting-receiving nothing is crosstalked the CDMA radio-frequency light transmission module that cost is low.
The technical solution of the utility model is: this CDMA radio-frequency light transmission module mainly comprises radio frequency/light signal transition components and optical fiber/radiofrequency signal transition components, radio frequency/light signal transition components is by input matching circuit 3, high-pass filtering circuit 5, drive circuit 2 and laser 1 are formed, optical fiber/radiofrequency signal transition components is by PIN/ optical fiber changeover circuit 7, coupling amplifying circuit 8, high-pass filtering circuit 9 and amplifying circuit 10 are formed, it is characterized in that: the upstream data. signals line in the repeater is connected with the input pin of FSK modulator, the output pin 9 tape splicing bandpass filters 4 of FSK modulator, drive circuit for laser 2 is received in the output of band pass filter 4, another road tape splicing pass filter circuit 11 of the downlink data signal line of coupling amplifying circuit 8 outputs of optical fiber/radiofrequency signal transition components, the output of bandwidth-limited circuit 11 connects FSK demodulator circuit 12, demodulates descending data-signal.
Described radio-frequency light transmission module adopts single positive supply power supply.
Described radio-frequency light transmission module has the metal bead that increases radio frequency isolation between the up-downgoing passage.Described radio-frequency light transmission module by regulating the value of magnification of drive circuit 2, is regulated the laser Output optical power.
Described radio-frequency light transmission module is regulated rf gain by the value of magnification of regulating amplifying circuit 10.The utility model major advantage is in third order intermodulation, the radio frequency input vswr, and receive-transmit isolation, key technology index such as the low and transfer of data of output noise and function all meet or exceed international like product.Have following special advantages simultaneously:
(1) carries the FSK transceiver in the module, can transmit data-signal up to 20kbps.General manufacturer or do not design monitoring and controlling channels, otherwise the monitoring and controlling channels stability of design is not high, or the monitoring and controlling channels transmission rate not high (having only 10kbps) of design.
(2) adopt single positive supply power supply, can reduce the complexity of related system power supply design and effectively reduce the module volume.General manufacturer adopts duplicate supply or three power supply supply power modes, thereby has increased the complexity of system, has reduced the stability and the reliability of system, has also increased the volume of module, has increased cost.
(3) adopt radio shielding technology and power filter technology, can effectively prevent to receive and dispatch and crosstalk, increase isolation, isolation can reach 70dB at present.General manufacturer is not as adopting radio shielding and power filter technology, and its receive-transmit isolation can only reach about 50dB.
But laser output power, rf gain dynamic adjustments, the convenient use.
Description of drawings
Fig. 1 has provided block diagram of the present utility model.
Fig. 2 is radio frequency/light signal transition components modulation circuit figure.
Fig. 3 is optical fiber/radiofrequency signal transition components demodulator circuit figure.
Embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing:
Fig. 1 has provided block diagram of the present utility model.Radio-frequency light transmission module mainly contains with the lower part to be formed: radio frequency/light signal transition components and optical fiber/radiofrequency signal transition components.
Radio frequency/light signal transition components is made up of input matching circuit 3, high-pass filtering circuit 5, drive circuit 2 and laser 1.The upward signal RFIN that is received by discharging-directly station antenna arrives drive circuit for laser 2 through input matching circuit 3 and high-pass filtering circuit 5, by optical fiber the radiofrequency signal that receives is sent to the base station by drive circuit for laser 2 drive laser 1 then.Upstream data. signals in the repeater is by 6 modulation of FSK modulator, and drive circuit for laser 2 is delivered in 4 frequency-selectings through band pass filter then, by optical fiber the data-signal that receives is sent to the base station by drive circuit for laser 2 drive laser 1 then.
Optical fiber/radiofrequency signal transition components is made up of PIN/ optical fiber changeover circuit 7, coupling amplifying circuit 8, high-pass filtering circuit 9 and amplifying circuit 10. and the downstream signal RFIN that is received by repeater optical fiber converts light signal to the signal of telecommunication through PIN/ optical fiber changeover circuit 7, amplifies signal of telecommunication amplification the becoming signal of telecommunication that certain gain is arranged after electricity 8 will be changed by coupling then.The radiofrequency signal that is used to send and descending data-signal have been comprised in this signal of telecommunication simultaneously.The high-frequency signal that obtains being used to launch through high-pass filtering circuit 9 becomes the signal RFOUT that is fit to the discharging-directly station antenna emission through amplifying circuit 10 on the one hand, obtain data modulated signal by bandwidth-limited circuit 11 on the other hand, demodulate descending data-signal through FSK demodulator circuit 12 then.The utility model can be regulated rf gain by the amplification coefficient of regulating amplifying circuit 10, regulates the laser Output optical power by regulating drive circuit 2.
Between the up-downgoing passage, we adopt increases the isolation of radio frequency isolation press strip, thereby effectively reduces the interference of radiofrequency signal between the up-downgoing passage, has improved isolation.
Fig. 2 is the side circuit of the radio frequency/phase-locked modulation of light signal transition components of employing monolithic integrated phase lock NE564 composition, and it can modulate the frequency modulation intermediate-freuqncy signal of 40MHz.Among the figure, input FM signal IN PUT is added to 6 pin of NE562 by C1 electric capacity, and 2 pin that resistance R 1 is received 5V power supply and NE564 provide bias current I to NE564
bVariable resistor is received between the pin 4,5 and is used to finely tune modulating frequency.Capacitor C 10 is connected across between the pin 12,13, is used to provide 40M center modulating frequency.The signal OUT that demodulates is provided by the pin 9 of NE564.
Fig. 3 forms the side circuit of optical fiber/radiofrequency signal transition components demodulation of phase locking for adopting monolithic integrated phase lock NE564, but the frequency modulation intermediate-freuqncy signal of its demodulation 40MHz.Among the figure, input signal FM is added to 6 pin of NE562 by C1 electric capacity, and 2 pin that resistance R 3 is received 5V power supply and NE564 provide bias current I to NE564
bPin 4,5 T-Ring road filter capacitor C3, C4.Capacitor C 6 is connected across between the pin 12,13, is used to provide 40M center modulating frequency.The signal OUT that demodulates is provided by the pin 14 of NE564.The effect of C5 is the filtering high-frequency signal.
Claims (3)
1. CDMA radio-frequency light transmission module, mainly comprise radio frequency/light signal transition components and optical fiber/radiofrequency signal transition components, radio frequency/light signal transition components is by input matching circuit (3), high-pass filtering circuit (5), drive circuit for laser (2) and laser (1) are formed, optical fiber/radiofrequency signal transition components is by PIN/ optical fiber changeover circuit (7), coupling amplifying circuit (8), high-pass filtering circuit (9) and amplifying circuit (10) are formed, it is characterized in that: the upstream data. signals line in the repeater is connected with the input pin of FSK modulator, the output pin of FSK modulator (9) tape splicing bandpass filter (4), drive circuit for laser (2) is received in the output of band pass filter (4), another road tape splicing pass filter circuit (11) of the downlink data signal line of coupling amplifying circuit (8) output of optical fiber/radiofrequency signal transition components, the output of bandwidth-limited circuit (11) connects FSK demodulator circuit (12) and demodulates descending data-signal.
2. radio-frequency light transmission module according to claim 1 is characterized in that: adopt single positive supply power supply.
3. radio-frequency light transmission module according to claim 1 and 2 is characterized in that: the metal bead that increases radio frequency isolation is arranged between the up-downgoing passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200033833U CN201054595Y (en) | 2007-02-08 | 2007-02-08 | CDMA RF optical transmission module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200033833U CN201054595Y (en) | 2007-02-08 | 2007-02-08 | CDMA RF optical transmission module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201054595Y true CN201054595Y (en) | 2008-04-30 |
Family
ID=39394253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200033833U Expired - Fee Related CN201054595Y (en) | 2007-02-08 | 2007-02-08 | CDMA RF optical transmission module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201054595Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684550A (en) * | 2020-12-29 | 2021-04-20 | 中电科技集团重庆声光电有限公司 | Micro-system packaging structure for photoelectric transceiving processing |
-
2007
- 2007-02-08 CN CNU2007200033833U patent/CN201054595Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112684550A (en) * | 2020-12-29 | 2021-04-20 | 中电科技集团重庆声光电有限公司 | Micro-system packaging structure for photoelectric transceiving processing |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20030189974A1 (en) | Wireless full-duplex transmission system | |
| CN103401613B (en) | A kind of Techniques Used in Digital Microwave Transmission device and method | |
| CN103401612B (en) | Based on the optical fiber of FTTH network and wireless mixed access system and hybrid access method | |
| CN101599790A (en) | A kind of intelligent micropower optical fiber wireless covering system | |
| CN101902318B (en) | Bidirectional analog optical fiber transmission system with mixed WiFi and 3G signals | |
| CN101286782A (en) | Digital remote radio system with variable bandwidth and its realization method | |
| CN202503516U (en) | Transmission system supporting multiple communication modes | |
| CN204013544U (en) | A kind of multi-service optical fiber access indoor distributed system | |
| KR20050015105A (en) | Tdma type transceiver having cartesian feedback loop circuit | |
| CN102394698A (en) | Simulated optical fiber repeater distribution system integrated with coverage antenna | |
| CN201054595Y (en) | CDMA RF optical transmission module | |
| CN110149121B (en) | Adjustable ultra-wideband zero intermediate frequency transceiver radio frequency analog front end | |
| CN101809899A (en) | Improved fiber optic GPS link | |
| CN101562877A (en) | Remote method and equipment thereof for antenna of worldwide interoperability microwave access user terminal equipment | |
| US7680476B2 (en) | Receiving device | |
| CN2595089Y (en) | CDMA radio-frequency optical transmission module | |
| US10454662B2 (en) | Duplexer with signal cancellation | |
| CN109462438B (en) | Relay network element equipment, remote network element equipment and optical fiber distributed system | |
| CN201323582Y (en) | Digital companding frequency selection and shift coverage system | |
| TWI388144B (en) | Radio frequency circuit for a wireless signal transceiver and related wireless signal transceiver | |
| CN202424726U (en) | Multi-system RF light transmission module | |
| CN117118477B (en) | LTE, NB-IoT, loRa and Beidou multi-radio frequency fusion circuit, signal processing method and application | |
| CN218499132U (en) | Circuit for remotely controlling outdoor LNA | |
| CN223451960U (en) | Dual-mode DMR digital intermediate frequency board | |
| CN112929040A (en) | Communication transmitter based on photovoltaic power generation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080430 Termination date: 20110208 |