CN210469327U - Optical module supporting wide dynamic receiving optical power range - Google Patents
Optical module supporting wide dynamic receiving optical power range Download PDFInfo
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- CN210469327U CN210469327U CN201921994564.6U CN201921994564U CN210469327U CN 210469327 U CN210469327 U CN 210469327U CN 201921994564 U CN201921994564 U CN 201921994564U CN 210469327 U CN210469327 U CN 210469327U
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Abstract
The utility model provides a support wide developments and receive optical power scope optical module, put module, blocking electric capacity C1, band-pass filter amplifier including signal receiver, mirror current source module, transimpedance amplifier, logarithm fortune, signal receiver connects mirror current source module, mirror current source module with the transimpedance amplifier put the module connection to logarithm fortune, connect behind the module is put to logarithm fortune blocking electric capacity C1, blocking electric capacity C1 is connected band-pass filter amplifier, signal receiver is used for receiving current signal, the module is put to logarithm fortune is used for converting current signal into voltage signal with the logarithm form, blocking electric capacity C1 with band-pass filter amplifier cooperation filtering high frequency noise amplification low speed communication. And low-speed communication signals are extracted and amplified within an extremely wide dynamic optical power receiving range, and the loading and detection of the low-speed communication signals in the optical module are completed by matching with a mature serial port communication protocol.
Description
Technical Field
The invention relates to an optical module supporting low-speed communication in a wider dynamic receiving optical power range, which is mainly applied to the field of high-speed optical communication to eliminate the dependence of the quality of a low-speed communication signal on the intensity of receiving-end optical power.
Background
With the diversified development of the networking form of the optical communication network, the requirements on the optical transceiver module are not limited to the transceiving of high-speed data services, and various management and monitoring signals can be transmitted, so that the maintenance and operation of the optical communication network are simplified, and the intelligent development of the optical network is promoted.
The conventional optical transceiver module loads the management or monitoring signal, and a separate communication link is generally required to carry the management or monitoring signal, which increases the operation management cost.
At present, a popular method is to add a low-speed monitoring/management signal in addition to a high-speed communication signal, and then convert the low-speed monitoring/management signal into a voltage signal through a trans-impedance amplifier (TIA) at a receiving end and extract the voltage signal. An optical module based on amplitude modulation and with an in-band transparent transmission monitoring signal, as disclosed in patent CN204993356 m, is implemented in the process of fig. 1, by injecting a low-speed communication signal s (t) into an originating end of the optical module, loading signals '1', '0' onto a laser (EAM) in an amplitude modulation manner, implementing conversion of the low-speed signal from an electrical signal to an optical signal, and simultaneously, implementing electrical/optical conversion of a high-speed service signal Tx1 of the originating end via a modulator; after the light signal of the transmitting end is transmitted to the receiving end through the optical fiber network, A Photodiode (APD) of the receiving end realizes the conversion from the light signal to the electric signal and generates a corresponding current signal; the high-speed service signal is converted into a corresponding high-speed voltage signal by a trans-impedance Amplifier (TIA), then sent to a rear-end Amplifier unit (LA), meanwhile, a current signal of a proportional Mirror image of a Mirror current source (cmμ current Mirror) is converted into a voltage signal v (t) which is easy to detect and process by a circuit system by a low-pass filter (LPF) and a trans-impedance Amplifier (TIA/Amplifier), and finally sent to a comparator for distinguishing '1' and '0' signals, and a low-speed communication signal loaded by a sending end is extracted, as shown in fig. 2.
In the receiving end signal extracting circuit, after an input signal passes through a low pass filter circuit (LPF), only components above a low speed signal band are filtered, and after passing through a transimpedance amplifier, an output voltage v (t) is proportional to an input signal i (t), i (t) = i (t) × R, R is an effective transimpedance, and a photocurrent i (t) is proportional to the magnitude of optical power, which can be denoted as i (t) = p (t) × a, p (t) is a received optical power signal, and a is photoelectric conversion efficiency. For a particular device and receive detection circuit, a and R are deterministic and the output voltage v (t) is proportional to the received optical power. However, due to the difference of link loss in the communication network, the variation range of P may even exceed 1000 times (about 30dB dynamic range), when P is large (e.g. case1 in fig. 3), the low-speed communication signal V (t) extracted by the receiving end approaches the power supply voltage Vs μ pply, and as a result, the level difference (Va-Vb) may be compressed, when P is small (e.g. case3 in fig. 3), V (t) approaches 0V, and the level difference (Va-Vb) may also be compressed, and in addition, too small V (t) may also easily cause the Va (Vb-Vb) signal to be drowned by noise. The decrease of the effective amplitude (Va-Vb) of the low-speed communication signal causes that the back-end comparator cannot set a proper decision threshold Vth to distinguish whether Va and Vb are '1' or '0' signals, the receiving end cannot distinguish real originating information, and the probability of communication failure is greatly increased.
Disclosure of Invention
The utility model provides a support wide developments and receive optical power scope optical module utilizes and puts the module to draw the low-speed communication signal in the photocurrent to fortune, eliminates the dependence of receiving end signal amplitude to receiving end optical power, greatly improves receiving end work optical power scope.
The utility model provides an optical module supporting wide dynamic receiving optical power range, which comprises a signal receiver, a mirror current source module, a transimpedance amplifier, a pair operational amplifier module, a blocking capacitor C1 and a band-pass filter amplifier, the signal receiver is connected with a mirror current source module, the mirror current source module is connected with the transimpedance amplifier and the logarithmic operational amplifier module, the DC blocking capacitor C1 is connected behind the logarithmic operational amplifier module, the DC blocking capacitor C1 is connected with the band-pass filter amplifier, the signal receiver is used for receiving a current signal, the mirror current source module is used for mirroring the current signal transmitted by the signal receiver, the logarithmic operational amplifier module is used for converting current signals into voltage signals in a logarithmic mode, and the blocking capacitor C1 is matched with the band-pass filter amplifier to filter high-frequency noise and amplify low-speed communication signals.
For a communication system, the amplitude of a signal on a link is exponentially attenuated, an output voltage signal V (t) at a transmitting end passes through a link with an attenuation size of α, and then is represented as V (t) exp (- α), that is, the signal attenuation is 1/exp (α)' similarly, after a high-level Va signal and a low-level Vb signal at the transmitting end pass through the link attenuation, the difference of the signals at the receiving end can be represented as Va exp (-567) -Vb exp (- α) = (Va-Vb) × (- α), that is, after the link attenuation, the difference of the high level and the low level at the receiving end is also attenuated by an exponential factor, if the receiving end linearly amplifies/converts the signal, the output voltage difference of a linear amplifier can be represented as Δ V = k (Va-Vb) = exp (- α), Δ V is proportional to the line exp (- α), and for a certain linear amplification ratio k, the output voltage difference of a link with a variable voltage V = k 2 is generally equal to a linear amplification range of Δ V = 730, and a dynamic range of a receiving signal with a variable Δ V =30 dB.
However, if the receiving end uses the logarithmic op-amp, the output signal Δ V of the logarithmic op-amp can be expressed as k × log (Va × exp (- α)) -k × log (Vb × exp (- α)) = k × log (Va)) -log (Vb)), and Δ V is a difference signal independent of the link attenuation α, where k is the input and output gain of the logarithmic op-amp, therefore, the output of the receiving end is a fixed value for both α =0dB and α =30dB, which is very helpful for the amplification of the back-end circuit and the decision of the digital circuit, and increases the range of power variation that can be received.
The logarithmic operational amplifier module is adopted to extract low-speed signals, and no matter the RX end receives optical power of 0dBm or-30 dBm, the output difference (Va-Vb) of high and low levels in the I (t) signals does not change along with the change of the optical power and can be kept constant in a large optical power change range. The method is suitable for scenes requiring the receiving optical power of the receiving end to cover the maximum range change, and is more suitable for the low-speed communication requirement under the long-distance scene.
Furthermore, one end of the band-pass filter amplifier is connected with a blocking capacitor C2, and the band-pass filter amplifier is connected with the microprocessing unit through the blocking capacitor C2.
Further, the micro-processing unit comprises a serial port receiver, and the serial port receiver is connected with one end of the blocking capacitor C2 and is used for receiving signals transmitted by the blocking capacitor C2. The receiving end utilizes the serial port receiver in the microprocessing unit, utilizes ripe serial port communication protocol, and the serial port receiver detects input signal passively, and when having low-speed communication signal, the input signal level takes place the upset from high to low, and the work of automatic trigger serial port receiver detects out effectual communication data stream. Compared with the method that the MC mu is used for actively polling and detecting the GPIO state or the ADC is used for continuously sampling the input signal, the method has the advantages that software design and resource requirements can be greatly simplified.
Furthermore, one end of the logarithmic operational amplifier module is connected with the receiving optical power monitoring module and is used for detecting the receiving optical power. The working condition of the optical module can be monitored at any time.
Further, the optical module with a wide dynamic receiving optical power range provided by the present invention includes a modulation laser module, a transmitting end CDR, a receiving end CDR, the micro processing unit further includes a serial port transmitter and a mode converter, an input end of the modulation laser module is connected to an output end of the mode converter for transmitting a modulation signal, an input end of the mode converter is connected to the serial port transmitter, the serial port transmitter transmits a signal, the mode converter converts a signal mode, the signal is loaded on the modulation laser, the transmitting end CDR is connected to the modulation laser module, and the receiving end CDR is connected to the transimpedance amplifier.
Furthermore, the micro-processing unit further comprises a decoding module and an encoding module, wherein the decoding module is used for decoding the signals received by the serial port receiver, and the encoding module encodes the signals. The long connection '0' and the long connection '1' in the low-speed communication signal can be effectively eliminated, and the instability of the level during multi-byte communication is reduced.
Further, the modulated laser module includes any one of a direct-tuned laser, an electro-absorption modulator, and an MZM modulator.
Further, the mode converter comprises a current mode converter or a voltage mode converter.
The receiving and sending ends of the high-speed optical signal and the low-speed communication signal are integrated, the management of the optical network is realized by utilizing the low-speed communication signal loaded on the optical module, such as network state monitoring, remote online upgrade and the like, the operation and maintenance cost of the optical communication network is reduced, and the network is more intelligent.
The utility model has the advantages that: the optical module supports a wide dynamic receiving optical power range, adopts a logarithmic operational amplifier module and is matched with a blocking capacitor and a band-pass filter amplifier, extracts and amplifies low-speed communication signals in an extremely wide dynamic optical power receiving range, and is matched with a mature serial port communication protocol to complete loading and detection of the low-speed communication signals in the optical module.
Drawings
FIG. 1 is a diagram of a communication network in the background art
FIG. 2 is a diagram of signal transmission in the background art
FIG. 3 is a waveform diagram of voltage signals under different optical powers in the prior art
FIG. 4 is a schematic view of an optical module in embodiment 1
FIG. 5 is a schematic view of an optical module in embodiment 2
FIG. 6 is a current-voltage waveform diagram of a logarithmic operational amplifier of current-to-voltage type in example 1.
Detailed Description
The following provides a more detailed description of the present invention, with reference to the accompanying drawings.
The first embodiment is as follows:
as shown in fig. 4, the present embodiment is an optical module supporting a wide dynamic received optical power range, and includes a signal receiver, a mirror current source module, a logarithmic amplifier module, a dc blocking capacitor C1, a band-pass filter amplifier, a dc blocking capacitor C2, a transimpedance amplifier, a micro processing unit, and a received optical power monitoring module.
The output end of the signal receiver is connected with the input end of the mirror current module, the output end of the mirror current module is respectively connected with the input ends of the logarithmic operational amplifier module and the transimpedance amplifier, the output end of the logarithmic operational amplifier module is simultaneously connected with one end of the received optical power monitoring module and one end of the blocking capacitor C1, the other end of the blocking capacitor C1 is connected with the input end of the band-pass filter amplifier, the output end of the band-pass filter amplifier is connected with the blocking capacitor C2, and the blocking capacitor C2 is connected with.
The micro-processing unit comprises a serial port receiver and a decoding module, wherein the input end of the serial port receiver is connected with one end of a blocking capacitor C2.
The receiver receives the current signal, and the current signal is sent to the logarithmic operation and amplification module to be converted into a voltage signal after being mirrored by the mirror current source module. The difference signal output by the operational amplifier module is filtered by a DC blocking capacitor C1 to remove DC component, the band-pass filter amplifier amplifies the AC signal therein, and simultaneously filters out-of-band noise outside the low-speed communication signal therein.
As shown in fig. 6, the input/output relationship of the current-to-voltage logarithmic operation amplifier is that when the input current changes from 1 μ a to 10 μ a, the output voltage of the operational amplifier changes by 0.5V, and when the input current changes from 100 μ a to 1mA, the output voltage also changes by 0.5V, the magnitude of the output voltage is proportional to the logarithmic form log (I) of the input current I, and the output voltage V is not proportional to the input current I as in the transimpedance amplifier, and the input signal is linearly amplified.
The direct current offset is loaded by the blocking capacitor C2, so that the signal offset input to the serial port receiver is ensured to be at a higher direct current level when no low-speed communication signal exists. When a low-speed communication signal appears at a receiving end, the high level in the signal frame is inverted to the low level, so that the signal input to the serial port receiver is inverted, and the serial port receiver is triggered to work.
The serial port receiver receives the low-speed signal, and the decoding module decodes the signal.
The RX end receives a current signal, the current signal is mirrored through the mirror current source module, the mirrored current signal is converted through the logarithmic operation and amplification module and then outputs a voltage signal, the direct current part is used for receiving the light current detection of the receiver, the isolation capacitor C1 allows the low-speed communication signal to pass through, the band-pass filter amplifier filters and amplifies the signal, the isolation capacitor C2 and the direct current Bias voltage form voltage Bias of a Bias-Tee structure, the serial port receiver detects and extracts the signal, and the decoding module decodes the signal and extracts effective information in the signal.
Example two:
as shown in fig. 5, the optical module supporting a wide dynamic receiving optical power range in this embodiment can simultaneously implement optical receiving and transmitting functions, and includes a signal receiver, a transimpedance amplifier, a receiving side CDR, a mirror current source, a logarithmic operational amplifier module, a blocking capacitor C1, a band-pass filter amplifier, a blocking capacitor C2, a micro-processing unit, a modulated laser module, a transmitting side CDR, a receiver voltage, and a receiving optical power detection. The micro-processing unit comprises a serial port receiver, a decoding module, a serial port transmitter, an encoding module and a mode converter.
The output end of the signal receiver is respectively connected with the mirror current source and the transimpedance amplifier, and the output end of the transimpedance amplifier is connected with the input end of the receiving end CDR. The photocurrent of the receiver is output to a mirror current source, and the output end of the mirror current source is connected with the input end of the logarithmic operational amplifier module.
The output end of the logarithmic operational amplifier module is connected with a blocking capacitor C1 and is used for receiving optical power detection, the output end of the blocking capacitor C1 is connected with the input end of a band-pass filter amplifier, and the output end of the band-pass filter amplifier is connected with a blocking capacitor C2. The DC blocking capacitor C2 is connected with the input end of a serial port receiver in the microprocessing unit, and the output end of the serial port receiver is connected with the decoding module.
The receiver receives the current signal, and the current signal is sent to the logarithmic operation and amplification module to be converted into a voltage signal after being mirrored by the mirror current source module. The difference signal output by the operational amplifier module is filtered by a DC blocking capacitor C1 to remove DC component, the band-pass filter amplifier amplifies the AC signal therein, and simultaneously filters high-frequency noise outside the low-speed communication signal therein and suppresses the low-frequency noise of the circuit itself.
The direct current offset is loaded by the blocking capacitor C2, so that the signal offset input to the serial port receiver is ensured to be at a higher direct current level when no low-speed communication signal exists. When a low-speed communication signal appears at a receiving end, the high level in the signal frame is inverted to the low level, so that the signal input to the serial port receiver is inverted, and the serial port receiver is triggered to work.
The serial port receiver receives the low-speed signal, and the decoding module decodes the signal.
The input end of the serial port transmitter is connected with the coding module, the output end of the serial port transmitter is connected with the mode converter, the mode converter is connected with the modulation laser module, and the modulation laser module is connected with the transmitting terminal CDR.
The mode converter may be any one of a current converter and a voltage converter.
The coding module codes the signals of the transmitting end, converts the signals into corresponding analog semaphore by the serial port transmitter, and controls the loading of the low-speed communication signals of the transmitting end.
The analog signal is directly loaded on the modulation laser module through the mode converter, and the modulation laser module converts the electric signal into an optical signal.
The effective information of the sending end is coded by the coding module, the serial port transmitter stores a data stream to be sent, the mode converter converts the data stored by the serial port transmitter into a current or voltage signal which can be loaded on the modulation laser module, and the modulation laser module realizes the conversion of the signal from an electric signal to an optical signal and sends the signal out.
The above embodiments only exemplify preferred specific technical solutions and technical means, and do not exclude the scope of the claims of the present invention, and other alternatives to the technical means that can solve the technical problems should be understood as the contents of the claims of the present invention.
Claims (8)
1. An optical module supporting a wide dynamic received optical power range, comprising: the device comprises a signal receiver, a mirror current source module, a transimpedance amplifier, a logarithmic operational amplifier module, a blocking capacitor C1 and a band-pass filter amplifier, wherein the signal receiver is connected with the mirror current source module, the mirror current source module is connected with the transimpedance amplifier and the logarithmic operational amplifier module, the blocking capacitor C1 is connected behind the logarithmic operational amplifier module, the blocking capacitor C1 is connected with the band-pass filter amplifier,
the signal receiver is configured to receive a current signal,
the mirror current source module is used for mirroring the current signal transmitted by the signal receiver,
the logarithmic operational amplifier module is used for converting the current signal into a voltage signal in a logarithmic mode,
the blocking capacitor C1 is matched with the band-pass filter amplifier to filter high-frequency noise and amplify low-speed communication signals.
2. The optical module supporting wide dynamic receiving optical power range according to claim 1, wherein: one end of the band-pass filter amplifier is connected with a blocking capacitor C2, and the band-pass filter amplifier is connected with the microprocessing unit through the blocking capacitor C2.
3. The optical module supporting wide dynamic receiving optical power range according to claim 2, wherein: the micro-processing unit comprises a serial port receiver, and the serial port receiver is connected with one end of the blocking capacitor C2 and is used for receiving signals transmitted by the blocking capacitor C2.
4. The optical module supporting wide dynamic receiving optical power range according to claim 1, wherein: one end of the logarithmic operational amplifier module is connected with the receiving optical power monitoring module and used for detecting the receiving optical power.
5. The optical module supporting wide dynamic receiving optical power range according to claim 3, wherein: also comprises a modulation laser module, a sending terminal CDR and a receiving terminal CDR, the microprocessing unit also comprises a serial port transmitter and a mode converter,
the input end of the modulation laser module is connected with the output end of the mode converter and is used for transmitting a modulation signal,
the input end of the mode converter is connected with the serial port transmitter, the serial port transmitter sends signals, the mode converter converts signal modes, the signals are loaded on the modulation laser,
the transmitting side CDR is connected to the modulation laser module, and the receiving side CDR is connected to the trans-impedance amplifier.
6. The optical module supporting wide dynamic receiving optical power range according to claim 5, wherein: the micro-processing unit also comprises a decoding module and an encoding module, wherein the decoding module is used for decoding the signals received by the serial port receiver, and the encoding module encodes the signals.
7. The optical module supporting wide dynamic receiving optical power range according to claim 5, wherein: the modulated laser module comprises any one of a directly modulated laser, an electro-absorption modulator and an MZM modulator.
8. The optical module supporting wide dynamic receiving optical power range according to claim 5, wherein: the mode converter comprises a current mode converter or a voltage mode converter.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730040A (en) * | 2019-11-19 | 2020-01-24 | 杭州芯耘光电科技有限公司 | Low-speed communication method supporting wide dynamic receiving optical power range and optical module |
| CN112969111A (en) * | 2021-05-17 | 2021-06-15 | 深圳市迅特通信技术股份有限公司 | OAM demodulation circuit for optical module and optical module |
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2019
- 2019-11-19 CN CN201921994564.6U patent/CN210469327U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110730040A (en) * | 2019-11-19 | 2020-01-24 | 杭州芯耘光电科技有限公司 | Low-speed communication method supporting wide dynamic receiving optical power range and optical module |
| CN110730040B (en) * | 2019-11-19 | 2024-03-29 | 杭州芯耘光电科技有限公司 | Low-speed communication method supporting wide dynamic receiving optical power range and optical module |
| CN112969111A (en) * | 2021-05-17 | 2021-06-15 | 深圳市迅特通信技术股份有限公司 | OAM demodulation circuit for optical module and optical module |
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