CN216490512U - Optical fiber transceiver and pulse signal transceiving system - Google Patents
Optical fiber transceiver and pulse signal transceiving system Download PDFInfo
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- CN216490512U CN216490512U CN202122948229.6U CN202122948229U CN216490512U CN 216490512 U CN216490512 U CN 216490512U CN 202122948229 U CN202122948229 U CN 202122948229U CN 216490512 U CN216490512 U CN 216490512U
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Abstract
The utility model provides an optical fiber transceiver and a pulse signal transceiving system, wherein the optical fiber transceiver comprises: an optical transmitter and an optical receiver; the optical transmitter is connected with the transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber line; the optical transmitter is used for carrying out dark pulse modulation on the pulse time-frequency electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal; the optical receiver is connected with the receiving terminal equipment; the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted by the optical fiber line to obtain a transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to the receiving terminal equipment. The optical transmitter of the utility model carries out 'dark pulse' modulation on the time-frequency electric signal sent by the sending terminal equipment, and has the advantages of optical fiber line attenuation change resistance, stable transmission time delay and low cost.
Description
Technical Field
The utility model relates to the technical field of optical fiber transmission, in particular to an optical fiber transceiver and a pulse signal transceiving system.
Background
In many large measurement networks, time synchronization is required between time-frequency devices, and a central device sends time synchronization pulses or measurement start pulses, typically transmission Pulse Per Second (PPS), to other end devices. Such transmitted signals are characterized by a very low duty cycle, in some cases a pulse signal with a width of tens of ns is emitted within a time interval of one second, and the duty cycle can be as low as 10E-7. When the optical fiber is used as a transmission medium of a pulse time-frequency signal, the length of the optical fiber ranges from several meters to tens of kilometers, and the transmission delay of the signal is changed due to the influence of various environmental factors. This solution is suitable when the length of the optical fiber is long, but for the short distance between the equipments, the length of the optical fiber is within thousands of meters, even tens of meters, the above solution is too complex and costly.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide an optical fiber transceiver and a pulse signal transceiving system, which have the advantages of resistance to attenuation change of an optical fiber line, stable transmission delay and low cost.
In order to achieve the purpose, the utility model provides the following scheme:
a fiber optic transceiver comprising:
an optical transmitter and an optical receiver;
the optical transmitter is connected with transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber line; the optical transmitter is used for carrying out dark pulse modulation on the pulse time-frequency electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal;
the optical receiver is connected with receiving terminal equipment; and the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted by the optical fiber line to obtain a transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to a receiving terminal device.
Optionally, the optical transmitter specifically includes:
the device comprises a pulse signal shaping circuit, a laser current driver, a laser, an automatic power controller and a first photoelectric detector;
the input end of the pulse signal shaping circuit is connected with the transmitting terminal equipment; the pulse signal shaping circuit, the laser current driver and the laser are sequentially connected; the output end of the laser is connected with one end of the optical fiber circuit;
the first photoelectric detector is connected with the automatic power controller; the first photoelectric detector is used for detecting a backward optical signal of the laser;
the automatic power controller is used for amplifying the back light signal and controlling the current drive of the laser according to the amplified back light signal to form the closed-loop control of the automatic light power.
Optionally, the optical receiver specifically includes:
the second photoelectric detector, the preamplifier, the comparison amplifier and the direct-current signal voltage division circuit;
the input end of the preamplifier is connected with the other end of the optical fiber circuit; the second photoelectric detector, the preamplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected with the receiving terminal equipment;
the input end of the direct current signal voltage division circuit is connected with the output end of the preamplifier; the output end of the direct current signal voltage division circuit is connected with the comparison threshold input end of the comparison amplifier;
the direct current signal voltage division circuit is used for carrying out voltage division processing on a direct current component of an output signal of the preamplifier, and the direct current component after voltage division processing is used as a comparison threshold voltage of the comparison amplifier to be input into the comparison amplifier.
Optionally, the optical receiver further includes:
a filter circuit;
the input end of the filter circuit is connected with the output end of the preamplifier;
and the output end of the filter circuit is connected with the input end of the direct current signal voltage division circuit.
A pulse signal transceiving system comprising:
the optical fiber transceiver comprises a transmitting terminal device, a plurality of optical fiber transceivers and a plurality of receiving terminal devices;
the transmitting terminal equipment is respectively connected with the plurality of optical fiber transceivers; and the plurality of optical fiber transceivers and the plurality of receiving terminal devices are respectively connected in a one-to-one correspondence manner.
According to the specific embodiment provided by the utility model, the utility model discloses the following technical effects:
the utility model provides an optical fiber transceiver and a pulse signal transceiving system, wherein the optical fiber transceiver comprises: an optical transmitter and an optical receiver; the optical transmitter is connected with the transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber circuit; the optical transmitter is used for carrying out dark pulse modulation on the pulse time-frequency electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal; the optical receiver is connected with the receiving terminal equipment; the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted by the optical fiber line to obtain a transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to the receiving terminal equipment. The optical transmitter of the utility model carries out 'dark pulse' modulation on the time-frequency electric signal sent by the sending terminal equipment, and has the advantages of optical fiber line attenuation change resistance, stable transmission time delay and low cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic diagram of a fiber optic transceiver for "bright pulse" modulated pulse signals according to the prior art;
fig. 2 is a schematic diagram illustrating a change in amplitude of a pulse signal output by an optical fiber transceiver for "bright pulse" modulation of a pulse signal in the prior art when the attenuation of an optical fiber changes;
FIG. 3 is a schematic diagram illustrating a variation of an amplitude of a pulse signal output by an optical fiber transceiver for "bright pulse" modulation of a pulse signal in the prior art after an optical fiber attenuation is increased by 5 dB;
FIG. 4 is a schematic diagram of an optical fiber transceiver for "dark pulse" modulation of a pulse signal according to an embodiment of the present invention;
FIG. 5 is a schematic diagram illustrating the variation of the amplitude of the pulse signal output by the optical fiber transceiver for "dark pulse" modulation of the pulse signal when the attenuation of the optical fiber varies according to the embodiment of the present invention;
FIG. 6 is a schematic diagram illustrating the variation of the amplitude of the pulse signal output by the optical fiber transceiver for "dark pulse" modulation of the pulse signal according to the embodiment of the present invention after the attenuation of the optical fiber is increased by 5 dB;
description of the drawings: 1-a pulse signal shaping circuit; 2-laser current driver; 3-a laser; 4-an automatic power controller; 5-a first photodetector; 6-a second photodetector; 7-a preamplifier; 8-comparison amplifier 9-direct current signal voltage division circuit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The utility model aims to provide an optical fiber transceiver and a pulse signal transceiving system, which have the advantages of resistance to attenuation change of an optical fiber line, stable transmission delay and low cost.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 4 is a schematic structural diagram of an optical fiber transceiver for modulating a pulse signal by a "dark pulse" in an embodiment of the present invention, and as shown in fig. 4, the present invention provides an optical fiber transceiver, including:
an optical transmitter and an optical receiver;
the optical transmitter is connected with the transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber circuit; the optical transmitter is used for carrying out dark pulse modulation on the pulse time-frequency electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal;
the optical receiver is connected with the receiving terminal equipment; the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted by the optical fiber line to obtain a transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to the receiving terminal equipment.
Specifically, the optical transmitter specifically includes:
the device comprises a pulse signal shaping circuit 1, a laser current driver 2, a laser 3, an automatic power controller 4 and a first photoelectric detector 5;
the input end of the pulse signal shaping circuit is connected with the transmitting terminal equipment; the pulse signal shaping circuit, the laser current driver and the laser are sequentially connected; the output end of the laser is connected with one end of the optical fiber circuit;
the first photoelectric detector is connected with the automatic power controller; the first photoelectric detector is used for detecting a backward optical signal of the laser;
the automatic power controller is used for amplifying the back light signal and controlling the current drive of the laser according to the amplified back light signal to form the closed-loop control of the automatic light power.
Specifically, the optical receiver specifically includes:
the second photoelectric detector 6, the preamplifier 7, the comparison amplifier 8 and the direct current signal voltage division circuit 9;
the input end of the preamplifier is connected with the other end of the optical fiber circuit; the second photoelectric detector, the preamplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected with the receiving terminal equipment;
the input end of the direct current signal voltage division circuit is connected with the output end of the preamplifier; the output end of the direct current signal voltage division circuit is connected with the comparison threshold input end of the comparison amplifier;
the direct current signal voltage division circuit is used for carrying out voltage division processing on a direct current component of an output signal of the preamplifier, and the direct current component after voltage division processing is used as a comparison threshold voltage of the comparison amplifier to be input into the comparison amplifier.
Further, the optical receiver further includes:
a filter circuit (not shown in the figure);
the input end of the filter circuit is connected with the output end of the preamplifier;
the output end of the filter circuit is connected with the input end of the direct current signal voltage division circuit.
As shown in fig. 1, the current pulse optical fiber transceiver solution includes two parts: the pulse signal shaping circuit and the laser current driving circuit form an optical transmitter; the optical receiver is composed of a preamplifier and a comparison amplifier. The optical transmitter completes the electric-optical conversion, and the optical receiver completes the optical-electric conversion and the pulse regeneration.
In the current optical fiber transceiver technical scheme, an optical signal modulation mode of a "bright pulse" mode is adopted, that is: when the pulse occurs, the logic signal is corresponding to '1', and the logic signal is corresponding to 'high optical power level'; when no pulse occurs, a "0" logic signal corresponds to a "no light power level or an extremely low light power level". In an optical transmitter, when a pulse signal-1 signal appears at an input end, a pulse signal shaping circuit generates the 1 signal, so that a laser current driving circuit generates current to drive a laser to emit light and generate an optical pulse signal corresponding to the pulse signal; when the input end does not generate a pulse signal, namely a '0' signal, the pulse signal shaping circuit generates a '0' signal, so that the laser current driving circuit does not output current to drive the laser, the laser does not emit light, and the output light power is 0 or extremely low light power level.
The light pulse light signal is transmitted to a photoelectric detector in the light-electricity conversion by an optical fiber to be converted into light current, and the light current is amplified by a preamplifier to obtain a pulse signal VpAnd regenerating by the comparison amplifier circuit to finally obtain regenerated pulse output.
In the above process, the optical pulse signal modulated in the "bright pulse" manner is used, and when the pulse duty ratio is low, it is inconvenient to detect the pulse amplitude level in the output optical signal in the optical transmitter to implement the automatic optical power control; in an optical receiver, it is not convenient either to implement automatic gain control to control pulse amplitude stability or to detect well the pulse amplitude level to automatically adjust the comparison threshold level of the comparison amplifier. Therefore, when the pulse is regenerated, the comparison amplifier can only perform comparison amplification by using a fixed comparison threshold level to regenerate the pulse signal, as shown in fig. 2 and 3.
In the example of FIG. 2, the threshold levels V are comparedthTaking a fixed value, e.g. pulse signal V p1/6 of (1). When the attenuation of the optical fiber changes, the amplitude of the pulse signal output by the preamplifier changes correspondingly, and as in the example of fig. 3, after the attenuation of the optical fiber is increased by 5dB, the amplitude of the pulse signal changes from VpIs reduced to V'p，V'p＝Vp/3. Due to comparison of threshold levels VthThe time position of the rising edge of the regenerated pulse signal obtained by the comparison amplifier is changed to be a fixed value, the change is delta t, the magnitude of delta t is equal to the change of the amplitude of the pulse signal, and the rising edge of the pulse signalThe rate is relevant. When the variation of the amplitude of the pulse signal is large, for example, 10dB, the rising edge rate of the pulse signal is low, for example, 1ns, and in the above example, the value of Δ t can reach more than 600 ps. In some applications, transmission delay variations of hundreds of ps exceed the tolerance.
As shown in fig. 4, the technical solution of the fiber pulse transceiver circuit device of the present invention includes two parts: an optical transmitter and an optical receiver. The optical transmitter performs the electrical-to-optical conversion, and the optical receiver performs the optical-to-electrical conversion and the pulse regeneration.
The optical transmitter includes: pulse signal shaping, laser current driving, automatic power control, a laser and a first photoelectric detector; the laser power control circuit is connected with the first photoelectric detector, the second photoelectric detector is connected with the second photoelectric detector, and the second photoelectric detector is connected with the second photoelectric detector.
The optical receiver includes: the second photoelectric detector, the preamplifier, the comparison amplifier and the direct current signal voltage division; the second photoelectric detector, the preamplifier and the comparison amplifier are sequentially connected, the direct current signal voltage division circuit filters an output signal of the preamplifier to obtain a direct current component of the signal, and the direct current component is connected to one input end of the comparison amplifier after being subjected to voltage division by the resistor to serve as a comparison threshold voltage of the comparison amplifier.
In the device, a light signal modulation mode of a 'dark pulse' mode is adopted, a pulse signal appears, corresponds to a '1' logic signal and corresponds to 'no light power level or extremely low light power level'; no pulse signal is present, corresponding to a "0" logic signal, corresponding to a "high optical power level". When a pulse signal-1 signal appears at the input end, the pulse signal shaping circuit generates a 1 signal, the laser current driving circuit does not generate current to drive the laser, the laser does not emit light or only emits light with low power, and the output light power is 0 or extremely low light power level; when the input end does not have a pulse signal, namely a '0' signal, the pulse signal shaping circuit generates a '0' signal, the laser current driving circuit outputs current to drive the laser to emit light, and the output light power is high light power.
After the optical signal modulation mode of a 'dark pulse' mode is adopted, because the pulse duty ratio is very low and is lower than 10E-3, at the end of an optical transmitter, the optical signal output by the optical transmitter is an approximately direct-current high-power optical signal in most of time; when a pulse signal is present, the optical transmitter outputs an optical power at a lower value, such as less than-30 dBm. Thus, it is easy to adopt the back-light signal DC signal amplifying circuit to form the automatic optical power control circuit, so that the average optical power level of the optical signal outputted by the optical transmitter tends to a stable value, such as 0dBm, and the amplitude level value of the optical pulse signal is also approximately equal to the average power level value of the optical signal. Since the amplitude level of the optical pulse is approximately equal to the average output optical power of the laser, the amplitude of the pulse signal in the optical signal can be stabilized by controlling the average output optical power of the optical transmitter to be stable.
After the optical signal modulation mode of the "dark pulse" mode is adopted, in the embodiment, a preamplifier in the optical receiver simultaneously amplifies a direct current signal and a pulse signal contained in the optical signal, the level of the pulse signal is approximately equal to the level of the direct current signal, and the amplitude level of the pulse signal is obtained by detecting the direct current level of the received optical signal; the DC signal voltage divider circuit filters the output signal of the preamplifier to obtain the DC component of the signal, which is divided by the resistor and then sent to one input end of the comparison amplifier as the comparison threshold voltage of the comparison amplifier, and the output signal of the preamplifier is also sent to the other input end of the comparison amplifier. When the comparison amplifier regenerates the pulse signal, the comparison threshold level of the comparison amplifier is automatically adjusted by using the direct current level of the obtained signal, a comparison threshold level circuit of the comparison amplifier automatically tracks the change of the amplitude level of the pulse signal, so that the ratio of the amplitude level of the pulse signal to the comparison threshold level is kept almost unchanged, the time position of the rising edge of the regenerated pulse signal regenerated by the comparison amplifier does not change along with the change of the input pulse signal level, the influence of the change of the amplitude level of the pulse signal on the transmission delay is greatly weakened, and even if a device with lower speed and smaller bandwidth is adopted, the transmission delay can be ensured to be almost not changed along with the change of the loss of an optical fiber line when the loss of the optical fiber line changes.
As shown in FIGS. 5 and 6, the threshold level V is comparedthTaking the value as a pulse signal V p1/2, when the fiber attenuation changes, the pulse signal level output by the preamplifier changes correspondingly, when the fiber attenuation increases by 5dB, the pulse signal level changes from VpIs reduced to V'p，V'p＝Vp(V3) since the DC level of the signal is also reduced to 1/3, the threshold level V 'is compared'thAlso drops to 1/3, so V'th/V'p1/2, the ratio of the amplitude level of the pulse signal to the comparison threshold level is kept constant, and the rising edge time position of the regenerated pulse signal obtained by the comparison amplifier is kept constant.
In addition, the present invention also provides a pulse signal transceiving system, comprising:
the optical fiber transceiver comprises transmitting terminal equipment, a plurality of optical fiber transceivers and a plurality of receiving terminal equipment;
the transmitting terminal equipment is respectively connected with the plurality of optical fiber transceivers; the plurality of optical fiber transceivers and the plurality of receiving terminal devices are respectively connected in a one-to-one correspondence manner.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. Meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the utility model.
Claims (5)
1. A fiber optic transceiver, comprising:
an optical transmitter and an optical receiver;
the optical transmitter is connected with transmitting terminal equipment; the optical transmitter is connected with the optical receiver through an optical fiber line; the optical transmitter is used for carrying out dark pulse modulation on the pulse time-frequency electrical signal sent by the sending terminal equipment and carrying out electro-optical conversion on the modulated pulse time-frequency electrical signal to obtain a pulse time-frequency optical signal;
the optical receiver is connected with receiving terminal equipment; and the optical receiver performs photoelectric conversion on the pulse time-frequency optical signal transmitted by the optical fiber line to obtain a transmitted pulse time-frequency electrical signal, and transmits the transmitted pulse time-frequency electrical signal to a receiving terminal device.
2. The fiber optic transceiver of claim 1, wherein the optical transmitter comprises:
the device comprises a pulse signal shaping circuit, a laser current driver, a laser, an automatic power controller and a first photoelectric detector;
the input end of the pulse signal shaping circuit is connected with the transmitting terminal equipment; the pulse signal shaping circuit, the laser current driver and the laser are sequentially connected; the output end of the laser is connected with one end of the optical fiber circuit;
the first photoelectric detector is connected with the automatic power controller; the first photoelectric detector is used for detecting a backward optical signal of the laser;
the automatic power controller is used for amplifying the back light signal and controlling the current drive of the laser according to the amplified back light signal to form the closed-loop control of the automatic light power.
3. The fiber optic transceiver of claim 2, wherein the optical receiver comprises:
the second photoelectric detector, the preamplifier, the comparison amplifier and the direct-current signal voltage division circuit;
the input end of the preamplifier is connected with the other end of the optical fiber circuit; the second photoelectric detector, the preamplifier and the comparison amplifier are connected in sequence; the output end of the comparison amplifier is connected with the receiving terminal equipment;
the input end of the direct current signal voltage division circuit is connected with the output end of the preamplifier; the output end of the direct current signal voltage division circuit is connected with the comparison threshold input end of the comparison amplifier;
the direct current signal voltage division circuit is used for carrying out voltage division processing on a direct current component of an output signal of the preamplifier, and the direct current component after voltage division processing is used as a comparison threshold voltage of the comparison amplifier to be input into the comparison amplifier.
4. The fiber optic transceiver of claim 3, wherein the optical receiver further comprises:
a filter circuit;
the input end of the filter circuit is connected with the output end of the preamplifier;
and the output end of the filter circuit is connected with the input end of the direct current signal voltage division circuit.
5. A pulse signal transceiving system, the system comprising:
a transmitting terminal device, a plurality of fiber optic transceivers according to any of claims 1-4, and a plurality of receiving terminal devices;
the transmitting terminal equipment is respectively connected with the plurality of optical fiber transceivers; and the plurality of optical fiber transceivers and the plurality of receiving terminal devices are respectively connected in a one-to-one correspondence manner.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122948229.6U CN216490512U (en) | 2021-11-29 | 2021-11-29 | Optical fiber transceiver and pulse signal transceiving system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202122948229.6U CN216490512U (en) | 2021-11-29 | 2021-11-29 | Optical fiber transceiver and pulse signal transceiving system |
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| CN216490512U true CN216490512U (en) | 2022-05-10 |
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| CN202122948229.6U Active CN216490512U (en) | 2021-11-29 | 2021-11-29 | Optical fiber transceiver and pulse signal transceiving system |
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