CN2595089Y - CDMA radio-frequency optical transmission module - Google Patents
CDMA radio-frequency optical transmission module Download PDFInfo
- Publication number
- CN2595089Y CN2595089Y CN03235150U CN03235150U CN2595089Y CN 2595089 Y CN2595089 Y CN 2595089Y CN 03235150 U CN03235150 U CN 03235150U CN 03235150 U CN03235150 U CN 03235150U CN 2595089 Y CN2595089 Y CN 2595089Y
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- radio
- circuit
- frequency
- transmission module
- light transmission
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- Expired - Fee Related
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Abstract
The utility model provides a CDMA radio-frequency/optical transmission module which is composed of a radio-frequency/optical signal conversion component and an optical fiber/radio-frequency signal conversion component. The utility model is characterized in that an FSK transceiver is arranged in the module, and a single positive power source supplies power to the utility model. The utility model adopts radio-frequency shielding technology and power supply filtering technology, and can effectively prevent sending and receiving serial interference, and increase the isolation effect. A laser is used for outputting optical power, and the radio-frequency gain is adjustable. The utility model sufficiently considers the distinctiveness of domestic repeater station products, and compared with the existing products, the utility model has complete functions.
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. transmission range is long, and 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 and 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.
Summary of the invention
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, receive-transmit isolation, at the bottom of the output noise and key technical index such as transfer of data 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 factory
Merchant otherwise do not design monitoring and controlling channels, or the design monitoring and controlling channels stability 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 subtract
The little module volume.General manufacturer adopts duplicate supply or three power supply supply power modes, thereby increases
The complexity of system, reduced the stability and the reliability of system, also increased module
Volume has increased cost.
(3) adopt radio shielding technology and power filter technology, can prevent effectively that transmitting-receiving from crosstalking, increase every
From degree, isolation can reach 70dB at present.General manufacturer is not as adopting the filter of radio shielding and power supply
Wave technology, 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.The downstream signal RFIN that is received by repeater optical fiber converts light signal to the signal of telecommunication, signal of telecommunication amplification the becoming signal of telecommunication that certain gain is arranged after will change by coupling amplifying circuit 8 then through PIN/ optical fiber changeover circuit 7.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 INPUT 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 Ib to NE564.Variable 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
b Pin 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 (8)
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 value 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.
4. radio-frequency light transmission module according to claim 1 and 2 is characterized in that: by regulating the value of magnification of drive circuit (2), regulate the laser Output optical power.
5. radio-frequency light transmission module according to claim 1 and 2 is characterized in that: regulate rf gain by the amplification coefficient of regulating amplifying circuit (10).
6. radio-frequency light transmission module according to claim 3 is characterized in that: by regulating the value of magnification of drive circuit (2), regulate the laser Output optical power.
7. radio-frequency light transmission module according to claim 3 is characterized in that: regulate rf gain by the amplification coefficient of regulating amplifying circuit (10).
8. radio-frequency light transmission module according to claim 4 is characterized in that: regulate rf gain by the amplification coefficient of regulating amplifying circuit (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03235150U CN2595089Y (en) | 2003-01-09 | 2003-01-09 | CDMA radio-frequency optical transmission module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN03235150U CN2595089Y (en) | 2003-01-09 | 2003-01-09 | CDMA radio-frequency optical transmission module |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2595089Y true CN2595089Y (en) | 2003-12-24 |
Family
ID=33758087
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN03235150U Expired - Fee Related CN2595089Y (en) | 2003-01-09 | 2003-01-09 | CDMA radio-frequency optical transmission module |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2595089Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007065328A1 (en) * | 2005-12-08 | 2007-06-14 | Wuhan Winningchina Microsystem Technologies Co., Ltd. | A rf optical transmit device and a control method |
| CN1980095B (en) * | 2005-12-06 | 2010-05-12 | 武汉盛华微系统技术有限公司 | System and method for realizing network management path integrated in radio-frequency light transmission module |
-
2003
- 2003-01-09 CN CN03235150U patent/CN2595089Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1980095B (en) * | 2005-12-06 | 2010-05-12 | 武汉盛华微系统技术有限公司 | System and method for realizing network management path integrated in radio-frequency light transmission module |
| WO2007065328A1 (en) * | 2005-12-08 | 2007-06-14 | Wuhan Winningchina Microsystem Technologies Co., Ltd. | A rf optical transmit device and a control method |
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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 |