WO2022245137A1

WO2022245137A1 - Optical transceiver having amcc function

Info

Publication number: WO2022245137A1
Application number: PCT/KR2022/007133
Authority: WO
Inventors: 노범선; 이동열; 이득주
Original assignee: (주) 라이트론
Priority date: 2021-05-20
Filing date: 2022-05-18
Publication date: 2022-11-24
Also published as: KR102481543B1; KR20220157076A

Abstract

The present invention is configured so that when a main controller provides an AMCC transmission data signal to an optical transmission module through direct digital communication with the optical transmission module, the optical transmission module generates an over-modulated transmission data signal by using a traffic transmission data signal and the AMCC transmission data signal. According to the present invention, an optical transceiver may have an AMCC function even if an analog pin is not provided in the optical transmission module. In addition, since a modem and an addition circuit, which are provided in conventional optical transceivers, are not required in the present invention, the present invention, when compared to conventional optical transceivers, can be made smaller in size, and the structural complexity of the optical transceiver can be reduced as well as the price.

Description

Optical transceiver with AMCC function

The present invention is capable of transmitting and receiving data signals (hereinafter referred to as 'AMCC data signals') for status monitoring and function control between optical transceivers through an auxiliary management and control channel (hereinafter referred to as 'AMCC'). It relates to an optical transceiver having an AMCC function that can be used.

In a conventional optical network, when an optical transceiver located locally performs state monitoring and function control of an optical transceiver located remotely (hereinafter referred to as 'external optical transceiver'), transmission and reception between optical transceivers After preparing a separate optical channel in addition to the optical channel for the traffic data signal, an optical transceiver located locally through the separately prepared optical channel monitors the state of the external optical transceiver and controls functions. However, when the optical channel is provided separately, there is a problem in that only general state monitoring and function control of the external optical transceiver are possible, but detailed state monitoring and function control are not possible. In addition, in an optical network in the mobile field where a large amount of traffic data signals exist, it has been required to be able to monitor the state of external optical transceivers and control functions without preparing a separate optical channel.

Accordingly, in ITU G.989.2 Amendment 1, an AMCC standard for transmitting and receiving AMCC data signals between optical transceivers through a subchannel (ie, AMCC) generated by over-modulating the traffic data signals of optical transceivers. presented.

1 is a diagram showing a first example of a conventional optical transceiver having an AMCC function.

According to the conventional optical transceiver 10 shown in FIG. 1, an AMCC transmission data signal for state monitoring and function control of an external optical transceiver (not shown) is transmitted from the main controller 13 to the modem 14 as a binary signal. When input in the form, the modem 14 modulates the binary signal and outputs a modulated signal. More specifically, the modem 14 modulates a binary signal with a frequency shift keying (FSK) modulation method, modulates a binary signal with an amplitude shift keying (ASK) modulation method, or modulates a modulated signal with a phase shift keying (PSK) modulation method. print out

The modulated signal output from the modem 14 is input to the addition circuit 15 together with the LD (Laser Diode) bias signal provided from the main controller 13, and at this time, the addition circuit 15 generates the LD bias signal and the modulation The added signal obtained by adding the signals is output in the form of an analog signal. The addition signal in the form of an analog signal output from the addition circuit 15 is input to the optical transmission module 11 through an analog pin provided in the transmitter optical sub-assemblies (TOSA) 11.

Also, the optical transmission module 11 may receive a traffic transmission data signal from the manager system 1 . In this case, the optical transmission module 11 overlays the addition signal on the traffic transmission data signal to generate an overmodulated transmission data signal. At this time, the AMCC transmission data signal exists in the overmodulation transmission data signal, and thus the optical transceiver 10 can monitor the state of the external optical transceiver and control functions through the AMCC transmission data signal.

An overmodulation received data signal is input to the Receiver Optical Sub-Assemblies (ROSA) 12. Here, the overmodulation reception data signal corresponds to an overmodulation transmission data signal output from an external optical transceiver to the optical transceiver 10 . The overmodulated received data signal includes a traffic received data signal, an AMCC received data signal overlaid on the traffic received data signal, and a noise signal.

Among the over-modulated received data signals input to the optical receiving module 12, the traffic received data signal passes through a high-speed TIA (Trans-Impedence Amplifier, not shown) provided inside the optical receiving module 12 to the manager system 1. It is passed on.

Meanwhile, the booster circuit 16 generates a light receiving module bias signal of several tens of volts (V) so that the light receiving module 12 can operate, and the light receiving module bias signal passes through the current mirror circuit 17 to It is supplied to the receiving module 12. When the light receiving module bias voltage is supplied to the light receiving module 12 and the overmodulated reception data signal is input to the light receiving module 12, a current flows in the light receiving module 12. At this time, the magnitude of the flowing current is It is different according to the strength of the overmodulation received data signal (ie, optical signal) received by the light receiving module 12 and the level (0 or 1) of the AMCC received data signal. The current mirror circuit 17 senses the current flowing through the light receiving module 12 and outputs the sensed current as a current signal through a mirroring port of the current mirror circuit 17 .

The current signal output from the current mirror circuit 17 is input to the I-V converting circuit 18, and the I-V converting circuit 18 converts the current signal into a voltage signal through a built-in resistor (not shown) to generate the voltage output a signal At this time, the AC component of the voltage signal includes the AMCC received data signal and the noise signal, and the AC component of the voltage signal is transferred to a low pass filter (LPF) 19. Meanwhile, the DC component of the voltage signal is transmitted to the main controller 13, and the main controller 13 is used to monitor the power of the overmodulation received data signal. In this way, in the conventional optical transceiver 10, the DC component of the voltage signal is provided only to the main controller 13.

The low-pass filter 19 performs low-pass filtering on the AC component of the voltage signal to filter signals other than the AMCC received data signal, and outputs a low-pass filtered signal.

A pre-amplifier 20 pre-amplifies the low-pass filtered signal and outputs a pre-amplified signal. The pre-amplification performed by the pre-amplifier 20 suppresses noise signals from the low-pass filtered signal and amplifies only the AMCC received data signal.

Meanwhile, the amplitude of the preamplified signal output from the preamplifier 20 depends on the magnitude of the DC component of the voltage signal output from the I-V converting circuit 18 (or the power of the overmodulated received data signal). It is different. That is, as the magnitude of the DC component of the voltage signal decreases, the magnitude of the preamplified signal output from the preamplifier 20 decreases, and as the magnitude of the DC component of the voltage signal increases, the magnitude of the preamplified signal output from the preamplifier 20 increases. The magnitude of the amplified signal increases.

If the magnitude of the DC component of the voltage signal output from the I-V converter circuit 18 is too small, the magnitude of the pre-amplified signal output from the pre-amplifier 20 is also very small, so eventually the main controller 13 AMCC The received data signal cannot be properly recognized. Conversely, if the magnitude of the DC component of the voltage signal output from the I-V converting circuit 18 is too large, it exceeds the amplification range of the preamplifier 20, and distortion occurs in the preamplified signal output from the preamplifier 20. It happens. Accordingly, a variable gain control (VGC) amplifier 21 capable of variably controlling a gain according to the magnitude of a preamplified signal output from the preamplifier 20 is required.

Conventionally, for the operation of the VGC amplifier 21, an output monitor 22 for monitoring the magnitude of a signal output from the VGC amplifier 21 was provided. In addition, conventionally, a VGC amplifier controller 23 was provided to control the gain of the VGC amplifier 21 by receiving information about the output signal from the output monitor 22 and comparing it with a preset signal level. . When the VGC amplifier controller 23 completes the gain control of the VGC amplifier 21, the output monitor 22 transfers the AMCC received data signal to the modem 14, and then the modem 14 sends the main controller 13 ), the AMCC received data signal is provided in the form of a binary signal.

As such, the conventional optical transceiver 10 shown in FIG. 1 includes a modem 14 to have an AMCC function. For this reason, the modulation frequency and transmission rate of the conventional optical transceiver 10 were inevitably determined entirely by the modem specifications defined by the modem manufacturer. In addition, since the size of the modem 14 is larger than that of a general-purpose IC (Integrated Circuit), it is difficult to meet the standard size of the optical transceiver 10 when the modem 14 is provided in the optical transceiver 10.

In addition, in the conventional optical transceiver 10, gain control of the VGC amplifier 21 is achieved through a feedback configuration consisting of the VGC amplifier 21, the output monitor 22, and the VGC amplifier controller 23. Accordingly, when the preamplified signal input to the VGC amplifier 21 changes, the AMCC received data signal transmitted from the output monitor 22 to the modem 14 is greatly delayed, and the delay causes the AMCC An error problem of the received data signal also occurs. In addition, in the case of the conventional optical transceiver 10, the output monitor 22 was necessarily provided to provide the AMCC received data signal to the main controller 13, which increases the size of the optical transceiver 10 and , was acting as a cause of increasing the configuration complexity and price of the optical transceiver 10.

Meanwhile, FIG. 2 is a diagram showing a second example of a conventional optical transceiver having an AMCC function, omitting an optical receiving module and showing only the optical transmitting module.

According to the conventional optical transceiver shown in FIG. 2, an AMCC transmission data signal for state monitoring and function control of an external optical transceiver (not shown) is transmitted from the main controller 13' to the adder circuit 15' along with the LD bias signal. is entered In this case, the addition circuit 15' outputs an addition signal obtained by adding the LD bias signal and the AMCC transmission data signal in the form of an analog signal, and the addition signal is transmitted through an analog pin of the optical transmission module 11' It is entered in (11-1').

In addition, in the conventional optical transceiver shown in FIG. 2, the laser diode 11-1' receives a traffic transmission data signal from the manager system 1. In this case, the laser diode 11-1' generates an overmodulated transmission data signal by overlaying the addition signal on the traffic transmission data signal. At this time, since the AMCC transmission data signal exists in the overmodulated transmission data signal, the optical transceiver shown in FIG. 2 can monitor the state of the external optical transceiver and control functions through the AMCC transmission data signal.

However, when an overmodulation transmission data signal is generated by adding an AMCC transmission data signal to an LD bias signal as in the conventional optical transceiver shown in FIG. 2, the laser diode 11-1' ) is changed, so that the optical power and optical wavelength of the overmodulation transmission data signal fluctuate according to the AMCC transmission data signal. Among them, when the optical wavelength of the overmodulated transmission data signal is shaken, the line width of the overmodulation transmission data signal increases, and the increase in line width serves as a cause of lowering the transmission distance of the traffic transmission data signal.

In addition, the laser diode 11-1' has a difference in electric-to-optical conversion efficiency for each element and for each temperature. Accordingly, in order to keep the magnitude of the AMCC transmission data signal constant, the magnitude of the AMCC transmission data signal must be set according to conditions for each element and temperature of the laser diode 11-1', which is it becomes a difficulty

3 is a diagram showing a third example of a conventional optical transceiver having an AMCC function. In FIG. 3, as in FIG. 2, the light receiving module is omitted and only the light transmitting module is shown. There is a difference from FIG. 2 .

In the conventional optical transceiver shown in FIG. 3, the laser diode 11-1" receives the LD bias signal output from the main controller 13". In this case, the laser diode 11-1" outputs a transmission light signal with a bias set according to the LD bias signal, and the transmission light signal is input to the modulator 11-2".

An AMCC transmission data signal for state monitoring and function control of an external optical transceiver (not shown) is directly input from the main controller 13" to the summing circuit 15" together with the modulator bias signal. In this case, the addition circuit 15" outputs an addition signal obtained by adding the modulator bias signal and the AMCC transmission data signal in the form of an analog signal, and the addition signal is transmitted to the modulator (through an analog pin of the optical transmission module 11"). 11-2").

In the conventional optical transceiver shown in FIG. 3, the modulator 11-2" receives the traffic transmission data signal from the manager system 1. In this case, the modulator 11-2" adds the addition signal to the traffic transmission data signal. Overlay to generate an overmodulated transmit data signal. At this time, since the AMCC transmission data signal exists in the overmodulated transmission data signal, the optical transceiver shown in FIG. 3 can monitor the state of the external optical transceiver and control functions through the AMCC transmission data signal.

However, when an overmodulated transmission data signal is generated by adding an AMCC transmission data signal to a modulator bias signal as in the conventional optical transceiver shown in FIG. Variation and shaking of the optical wavelength of the overmodulation transmission data signal cause an increase in the line width of the overmodulation transmission data signal, and the increase in line width serves as a cause of lowering the transmission distance of the traffic transmission data signal.

In addition, the conventional optical transceiver shown in FIGS. 1 to 3 could have an AMCC function only when an analog pin is provided in the optical transmission module, which means that the AMCC function when the optical transmission module does not have an analog pin. There was a problem that it was impossible to implement an optical transceiver having . In addition, conventional optical transceivers having an AMCC function necessarily include

adder circuits

15, 15', and 15" for signal input through analog pins, thereby increasing the size of the optical transceiver and improving the configuration of the optical transceiver. There was a problem of increasing complexity and cost.

[Prior art]

Korean Patent Publication No. 10-2020-0029893 (2020.03.19.)

The present invention has been prepared to solve the above problems, and an object of the present invention is to provide an optical transceiver capable of having an AMCC function even if an analog pin is not provided in an optical transmission module.

In addition, an object of the present invention is to provide an optical transceiver that can be used universally compared to conventional optical transceivers.

In addition, an object of the present invention is to provide an optical transceiver that is smaller in size than conventional optical transceivers, and can also reduce the complexity and price of the configuration.

In addition, an object of the present invention is to provide an optical transceiver capable of reducing the processing time delay of an AMCC received data signal and improving the sensitivity of the AMCC received data signal.

In order to achieve the above object, an optical transceiver according to the present invention receives a traffic transmission data signal and an auxiliary management and control channel (AMCC) transmission data signal, and uses the traffic transmission data signal and the AMCC transmission data signal. an optical transmission module for generating an over-modulation transmission data signal and outputting the over-modulation transmission data signal to an external optical transceiver; an optical receiving module receiving an overmodulation received data signal from the external optical transceiver; and a main controller that provides the AMCC transmission data signal to the optical transmission module through direct digital communication with the optical transmission module and receives the AMCC reception data signal included in the overmodulation reception data signal. .

The main controller may perform the digital communication with the optical transmission module through Inter-Integrated Circuit (I2C) communication, and the optical transmission module may have a digital signal input port for the I2C communication.

The main controller modulates the binary signal by one of an On/Off Keying (OOK) modulation method, a Frequency Shift Keying (FSK) modulation method, an Amplitude Shift Keying (ASK) modulation method, and a Phase Shift Keying (PSK) modulation method to obtain the AMCC A transmission data signal can be generated.

The optical transmission module includes: an optical transmission module controller receiving the AMCC transmission data signal from the main controller, outputting an LD bias signal, and also outputting a gain control signal according to the AMCC transmission data signal; a laser diode outputting a transmission light signal with a bias set according to the LD bias signal; a semiconductor optical amplifier receiving the transmission optical signal output from the laser diode and controlling the gain of the transmission optical signal according to the gain control signal to output a gain-controlled transmission optical signal; and a modulator generating the overmodulation transmission data signal by overlaying the gain-controlled transmission optical signal on the traffic transmission data signal.

An optical transceiver according to the present invention includes a booster circuit providing a bias signal to the optical receiving module so that the optical receiving module can operate; a current mirror circuit sensing a current flowing through the light receiving module and outputting a current signal; an I-V converting circuit converting the current signal into a voltage signal and outputting the voltage signal; a low-pass filter for performing low-pass filtering on the AC component of the voltage signal and outputting a low-pass filtered signal; a pre-amplifier for pre-amplifying the low-pass filtered signal and outputting a pre-amplified signal; an AGC (Automatic Gain Control) amplifier which automatically gain-controls the pre-amplified signal and outputs the automatically-gain-controlled signal to the main controller; and an AGC amplifier controller for automatically controlling the gain of the AGC amplifier so that the level of the automatically gain-controlled signal output from the AGC amplifier is within a preset signal level range based on the level of the DC component of the voltage signal. can do.

The optical transceiver according to the present invention may further include a buffer that converts the level of the automatically gain-controlled signal into a level of a signal that can be input to the main controller so that the level-converted signal is provided to the main controller. .

In the present invention, when the main controller provides an AMCC transmission data signal to the optical transmission module through direct digital communication with the optical transmission module, the optical transmission module uses the traffic transmission data signal and the AMCC transmission data signal to generate an overmodulated transmission data signal. Since it is configured to generate, the optical transceiver can have the AMCC function even if the optical transmission module does not have an analog pin.

Since the present invention does not require a modem included in a conventional optical transceiver, it is more versatile than conventional optical transceivers whose modulation frequency and transmission rate are limited by the modem specifications prescribed by the modem manufacturer.

Since the present invention does not require an adder circuit and an output monitor as well as a modem provided in a conventional optical transceiver, the size of the optical transceiver can be reduced compared to the conventional optical transceiver, and the complexity and cost of the optical transceiver configuration can be reduced. be able to

In addition, when the overmodulation transmission data signal is generated through the method of controlling the gain of the semiconductor optical amplifier as in the present invention, there is no concern that the wavelength change of the overmodulation transmission data signal due to the change of the LD bias signal occurs. The problems of the optical transceiver shown in FIG. 2, such as the problem of reducing the transmission distance of the traffic transmission data signal and the difficulty in manufacturing the optical transceiver, can be improved. In addition, when the overmodulated transmission data signal is generated through the method of controlling the gain of the semiconductor optical amplifier as in the present invention, the modulator is free from the concern of being affected by the change in chirp characteristics due to the change in the modulator bias signal, and the modulator bias Since the change in the wavelength of the overmodulated transmission data signal due to the change in signal also does not occur, the problem of the transmission distance reduction of traffic transmission data, which is a problem of the optical transceiver shown in FIG. 3, can be improved.

In addition, the present invention is configured to provide the DC component of the voltage signal (ie, the DC component of the voltage signal output from the I-V converting circuit) to the AGC amplifier controller, which has been performed only for the conventional main controller. In addition, in the signal processing process of providing the AMCC received data signal to the main controller, the present invention, instead of the conventional feedback configuration consisting of a VGC amplifier, an output monitor, and a VGC amplifier controller, the AGC amplifier controller measures the magnitude of the DC component of the voltage signal. Based on this, it is configured to automatically control the gain of the AGC amplifier. According to the present invention, the processing time delay of the AMCC received data signal can be reduced compared to the conventional feedback configuration, and thus the error occurrence of the AMCC received data signal can be suppressed to improve the sensitivity of the AMCC received data signal. .

2 is a diagram showing a second example of a conventional optical transceiver having an AMCC function.

3 is a diagram showing a third example of a conventional optical transceiver having an AMCC function.

4 is a diagram illustrating an optical transceiver having an AMCC function according to an embodiment of the present invention.

FIG. 5 is a more detailed view of an optical transmission module in the optical transceiver shown in FIG. 4 .

6 shows (a) a waveform of a binary signal corresponding to an AMCC transmission data signal, (b) a signal waveform of which the binary signal is modulated by OOK modulation, (c) a signal waveform of which the binary signal is modulated by FSK modulation, (d) a signal waveform in which the binary signal is modulated using an ASK modulation method; and (e) a diagram showing a signal waveform in which the binary signal is modulated in a PSK modulation method.

7 shows (a) a waveform of a traffic transmission data signal, (b) a waveform of an overmodulated transmission data signal generated by overlaying an OOK modulated signal on the traffic transmission data signal, and (c) a FSK modulation of the traffic transmission data signal. A waveform of an overmodulation transmission data signal generated by overlaying the signal, (d) a waveform of an overmodulation transmission data signal generated by overlaying an ASK modulated signal on the traffic transmission data signal, (e) a waveform of the traffic transmission data signal It is a diagram showing a waveform of an overmodulation transmission data signal generated by overlaying a PSK modulated signal.

Hereinafter, an optical transceiver having an AMCC function according to the present invention will be described in detail with reference to the accompanying drawings. The accompanying drawings are provided by way of example in order to sufficiently convey the spirit of the present invention to those skilled in the art, and the present invention is not limited to the drawings presented below and can be embodied in any number of other forms. .

4 is a diagram showing an optical transceiver having an AMCC function according to an embodiment of the present invention, and FIG. 5 is a diagram showing an optical transmission module in the optical transceiver shown in FIG. 4 in more detail.

In the present invention, the traffic transmission data signal refers to a signal including high-speed data that the optical transceiver 100 transmits to an external optical transceiver. In the present invention, the traffic reception data signal refers to data received by the optical transceiver 1000 from an external optical transceiver, and a signal including high-speed data transmitted by the external optical transceiver to the optical transceiver 1000. Here, both the traffic transmission data signal and the traffic reception data signal may be optical signals.

In the present invention, the AMCC transmission data signal refers to a signal including low-speed data that the optical transceiver 1000 transmits to an external optical transceiver to perform state monitoring or function control of the external optical transceiver. In the present invention, the AMCC reception data signal is data that the optical transceiver 1000 receives from an external optical transceiver, and is transmitted to the optical transceiver 1000 in order for the external optical transceiver to perform state monitoring or function control of the optical transceiver 1000. means a signal that contains low-speed data. Here, both the AMCC transmission data signal and the AMCC reception data signal may be optical signals.

In addition, in the present invention, the AMCC function means that a subchannel (ie, AMCC) on which an AMCC transmission data signal can be loaded is formed in the traffic transmission data signal transmitted by the optical transceiver 1000, together with or separately from it. This means that a subchannel (ie, AMCC) on which an AMCC received data signal can be loaded is formed on the traffic received data signal received by the low optical transceiver 1000 .

An optical transceiver 1000 according to an embodiment of the present invention includes an optical transmission module (TOSA: Transmitter Optical Sub-Assemblies, 110), an optical reception module (ROSA: Receiver Optical Sub-Assemblies, 120), and a main controller 130. include

The optical transmission module 110 is communicatively connected to the manager system 1 and may receive a traffic transmission data signal to be transmitted to an external optical transceiver from the manager system 1 .

In addition, the optical transmission module 110 may receive the AMCC transmission data signal from the main controller 130 in the form of a binary signal. Referring to FIG. 6 , the main controller 130 may provide the binary signal as shown in FIG. 6 (a) to the optical transmission module 110 as the AMCC transmission data signal.

At this time, the main controller 130 modulates the binary signal using an On/Off Keying (OOK) modulation method as shown in FIG. 6(b) or a Frequency Shift Keying (FSK) modulation method as shown in FIG. 6(c). It can be modulated to generate an AMCC transmission data signal. Alternatively, the main controller 130 modulates the binary signal using ASK (Amplitude Shift Keying) modulation as shown in FIG. 6(d), or PSK (Phase Shift Keying) modulation as shown in FIG. 6(e) It can be modulated to generate an AMCC transmission data signal. That is, the main controller 130 modulates the binary signal as shown in FIG. 6 (a) by any one of the OOK modulation method, the FSK modulation method, the ASK modulation method, and the PSK modulation method to generate an AMCC transmission data signal, , the AMCC transmission data signal generated by the main controller 130 may be provided to the optical transmission module 110.

The main controller 130 may modulate the binary signal using any one of OOK modulation, FSK modulation, ASK modulation and PSK modulation through embedded software or firmware. Here, since the FSK modulation method, the ASK modulation method, and the PSK modulation method, unlike the OOK modulation method, the size of the binary signal must be continuously changed over time, the amount of signal processing required for modulation is large and the signal processing time is also long. . That is, when the main controller 130 modulates the binary signal using the OOK modulation method, the signal processing amount and signal processing time required for modulation can be reduced compared to other modulation methods.

The optical transmission module 110 generates an over-modulation transmission data signal using the traffic transmission data signal and the AMCC transmission data signal, and outputs the over-modulation transmission data signal to an external optical transceiver. A specific example in which the optical transmission module 110 generates an overmodulated transmission data signal will be described later.

Like the optical transceiver 1000, the external optical transceiver also includes an external light transmission module, an external light reception module, and an external main controller. The external optical transmission module may receive a traffic reception data signal to be received by the optical transceiver 1000 from an external manager system (not shown). Also, the external optical transmission module may receive an AMCC reception data signal from an external main controller.

An external optical transmission module generates an overmodulation reception data signal using the traffic reception data signal and the AMCC reception data signal, and outputs the overmodulation reception data signal to the optical transceiver 1000 . Accordingly, the optical receiving module 120 of the optical transceiver 1000 receives the overmodulated reception data signal output from the external optical transmitting module.

The main controller 130 may be made of or include a Micro Controller Unit (MCU). The main controller 130 provides AMCC transmission data signals to the optical transmission module 110 through direct digital communication with the optical transmission module 110 .

In addition, the main controller 130 receives an AMCC received data signal included in the overmodulated received data signal among the overmodulated received data signals input to the light receiving module 120 . Here, the fact that the main controller 130 performs direct digital communication with the optical transmission module 110 means that the main controller 130 and the optical transmission module 110 do not intervene any device including a modem. This means that the controller 130 performs digital communication with the optical transmission module 110 .

More specifically, the main controller 130 may perform digital communication with the optical transmission module 110 through Inter-Integrated Circuit (I2C) communication. At this time, the optical transmission module 110 may have a digital signal input port for the I2C communication, and accordingly, the main controller 130 transmits the optical transmission module 110 through I2C communication with the optical transmission module 110. An AMCC transmit data signal can be provided to. According to the present invention, it is possible to provide an optical transceiver 1000 capable of having an AMCC function even if the optical transmission module 110 does not have an analog pin.

Hereinafter, a specific example in which the optical transmission module 110 generates an overmodulated transmission data signal will be described.

As shown in FIG. 5, the optical transmission module 110 includes an optical transmission module controller 111, a laser diode (LD) 112, a semiconductor optical amplifier (SOA) 113, and a modulator 114. can include

The AMCC transmission data signal provided from the main controller 130 may be provided to the optical transmission module controller 111 . At this time, the main controller 130 may output an LD bias signal to drive the laser diode 112, and the LD bias signal may also be provided to the light transmission module controller 111. Here, both the LD bias signal and the AMCC transmission data signal may be in the form of digital signals. Alternatively, the main controller 130 may provide only the AMCC transmission data signal in the form of a digital signal to the optical transmission module controller 111.

The optical transmission module controller 111 may include or include a current digital-to-analog converter (IDAC) capable of converting a digital signal into an analog signal. The optical transmission module controller 111 may receive the LD bias signal and the AMCC transmission data signal from the main controller 130 and convert them into analog signals. In addition, the optical transmission module controller 111 outputs the LD bias signal and also outputs a gain control signal according to the AMCC transmission data signal. Alternatively, the optical transmission module controller 111 may receive only the AMCC transmission data signal from the main controller 130 and convert it into an analog signal form. In this way, when the optical transmission module controller 111 receives only the AMCC transmission data signal from the main controller 130, the optical transmission module controller 111 outputs a gain control signal according to the AMCC transmission data signal and simultaneously, A preset LD bias signal may be output to the transmission module controller 111 .

The laser diode 112 outputs a transmission light signal with a bias set according to the LD bias signal output from the light transmission module controller 111 .

A transmission light signal output from the laser diode 112 and a gain control signal output from the optical transmission module controller 111 are input to the semiconductor optical amplifier 113 .

Generation of the overmodulation transmission data signal in the present invention is based on controlling the gain of the semiconductor optical amplifier 113 according to the gain control signal output from the optical transmission module controller 111 . For example, in the AMCC transmission data signal provided to the optical transmission module controller 111, if the value of the AMCC transmission data signal is 0, the optical transmission module controller 111 converts a preset gain corresponding to “Low” to a gain control signal. If the value of the AMCC transmission data signal is 1, the optical transmission module controller 111 outputs a preset gain corresponding to “High” as a gain control signal. Here, the gain control signal may be a signal for amplifying current applied to the semiconductor optical amplifier 113 with different gains according to the value of the AMCC transmission data signal.

When a preset gain corresponding to "Low" is input to the semiconductor optical amplifier 113 as a gain control signal, the semiconductor optical amplifier 113 adjusts the gain of the transmission optical signal to the "Low" value according to the gain control signal. It is possible to generate a gain-controlled transmission optical signal by controlling the gain to a preset gain. In addition, when a preset gain corresponding to "High" is input to the semiconductor optical amplifier 113 as a gain control signal, the semiconductor optical amplifier 113 sets the gain of the transmission optical signal to the "High" according to the gain control signal. By controlling with a preset gain corresponding to , a gain-controlled transmission optical signal may be generated. The semiconductor optical amplifier 113 outputs the gain-controlled transmission optical signal generated in this way to the modulator 114.

The modulator 114 receives the traffic transmission data signal from the manager system 1 and receives the gain-controlled transmission optical signal from the semiconductor optical amplifier 113. In this case, the modulator 114 overlays the gain-controlled transmission optical signal on the traffic transmission data signal to generate an overmodulation transmission data signal. Since the AMCC transmission data signal exists in the overmodulated transmission data signal generated as described above, the optical transceiver 1000 can monitor the state of the external optical transceiver and control functions through the AMCC transmission data signal.

For example, the modulator 114 may receive a traffic transmission data signal as shown in FIG. 7(a) from the manager system 1.

In this case, the modulator 114 adds the gain-controlled transmission optical signal to the traffic transmission data signal (in this case, the gain-controlled transmission optical signal is derived from the AMCC transmission data signal generated by modulating a binary signal with the OOK modulation method) ), it is possible to generate an overmodulated transmission data signal as shown in FIG. 7(b).

Alternatively, the modulator 114 provides the traffic transmission data signal with the gain-controlled transmission optical signal (at this time, the gain-controlled transmission optical signal is derived from the AMCC transmission data signal generated by modulating a binary signal with the FSK modulation method) ), it is possible to generate an overmodulated transmission data signal as shown in FIG. 7(c).

Alternatively, the modulator 114 provides the traffic transmission data signal with the gain-controlled transmission optical signal (at this time, the gain-controlled transmission optical signal is derived from an AMCC transmission data signal generated by modulating a binary signal with an ASK modulation method) ), it is possible to generate an overmodulated transmission data signal as shown in FIG. 7(d).

Alternatively, the modulator 114 provides the traffic transmission data signal with the gain-controlled transmission optical signal (at this time, the gain-controlled transmission optical signal is derived from an AMCC transmission data signal generated by modulating a binary signal with a PSK modulation method) ), it is possible to generate an overmodulation transmission data signal as shown in FIG. 7(e).

The main controller 130 may output a modulator bias signal for driving the modulator 114 as well as the LD bias signal, and the modulator bias signal may be provided to the modulator bias signal controller 210. Here, the modulator bias signal may be in the form of a digital signal. The modulator bias signal controller 210 outputs the modulator bias signal to the modulator 114. At this time, the modulator 114 may output the overmodulation transmission data signal with a bias set according to the modulator bias signal.

The overmodulation transmission data signal generated by the optical transmission module 110 includes an AMCC transmission data signal. Such an AMCC transmission data signal is used by the optical transmitter 1000 to determine the state of the external optical transceiver (power of the transmission optical signal, power of the received optical signal, temperature of the external optical transceiver, driving current and drive of the laser diode provided in the external optical transceiver). voltage, etc.) or to control the function of an external optical transceiver (transmission channel change, on/off control of a laser diode provided in an external optical transceiver, etc.), and further information of the external optical transceiver (external It can also be used to determine the model name of an optical transceiver, IDENTIFICATION information of an external optical transceiver, etc.).

As such, in the present invention, when the main controller 130 provides an AMCC transmission data signal to the optical transmission module 110 through direct digital communication with the optical transmission module 110, the optical transmission module 110 is equipped with a semiconductor It is configured to generate an overmodulated transmission data signal by controlling the gain of the optical amplifier 113. According to the present invention, since a modem and an adder circuit provided in a conventional optical transceiver are not required, the size of the optical transceiver can be reduced compared to the conventional optical transceiver, and the complexity and cost of the optical transceiver can also be reduced. there will be

Referring back to FIG. 4 , the overmodulation received data signal is input to the light receiving module 120 as described above. Here, the overmodulation reception data signal corresponds to an overmodulation transmission data signal output from an external optical transceiver to the optical transceiver 1000 . The overmodulated received data signal includes a traffic received data signal, an AMCC received data signal overlaid on the traffic received data signal, and a noise signal.

Among the overmodulation received data signals input to the optical receiving module 120, the traffic received data signal passes through a high-speed TIA (Trans-Impedence Amplifier, not shown) provided inside the optical receiving module 120 to the manager system 1. It is passed on.

Meanwhile, among the overmodulation received data signals input to the light receiving module 120, the AMCC received data signal is finally provided to the main controller 130. Here, the optical transceiver 1000 according to an embodiment of the present invention includes a booster circuit 140, a current mirror circuit 150, and I-V converting to provide the AMCC received data signal to the main controller 130. It may include a circuit 160, a low pass filter (LPF) 170, a pre-amplifier 180, an automatic gain control (AGC) amplifier 190 and an AGC amplifier controller 200, , may further include a buffer 210 additionally.

The booster circuit 140 provides a light receiving module bias signal to the light receiving module 120 so that the light receiving module 120 can operate. More specifically, the booster circuit 140 generates a light receiving module bias signal (eg, a bias voltage) of several tens of volts (V) so that the light receiving module 120 can operate, and the light receiving module bias signal may be supplied to the light receiving module 120 through the current mirror circuit 150.

When the light receiving module bias voltage is supplied to the light receiving module 120 and the overmodulated reception data signal is input to the light receiving module 120, a current flows in the light receiving module 120. At this time, the magnitude of the flowing current is It is different according to the strength of the overmodulation received data signal (ie, optical signal) input to the light receiving module 120 and the level (0 or 1) of the AMCC received data signal. The current mirror circuit 150 senses the current flowing through the light receiving module 120 and outputs the sensed current as a current signal through a mirroring port of the current mirror circuit 150 .

The current signal output from the current mirror circuit 150 is input to the I-V converting circuit 160, and the I-V converting circuit 160 converts the current signal into a voltage signal through a built-in resistor (not shown) to generate the voltage signal. output a signal

At this time, the AC component of the voltage signal includes the AMCC received data signal and the noise signal, and the AC component of the voltage signal is transferred to the low pass filter 170. Meanwhile, the DC component of the voltage signal is transmitted to the AGC amplifier controller 200 as well as the main controller 130, and the main controller 130 and the AGC amplifier controller 200 monitor the power of the overmodulation received data signal. do. As such, the optical transceiver 1000 according to an embodiment of the present invention differs from the conventional optical transceiver 10 described above with respect to FIG. 1 in that the DC component of the voltage signal is transmitted to the AGC amplifier controller 200. there is

The low-pass filter 170 performs low-pass filtering on the AC component of the voltage signal to filter signals other than the AMCC received data signal (ie, noise signal), and outputs the low-pass filtered signal.

The pre-amplifier 180 pre-amplifies the low-pass filtered signal and outputs a pre-amplified signal. The pre-amplification performed by the pre-amplifier 180 suppresses noise signals from the low-pass filtered signal and amplifies only the AMCC received data signal.

As described above, the magnitude of the preamplified signal output from the preamplifier 180 depends on the magnitude of the DC component of the voltage signal output from the I-V converting circuit 160 (or the power of the overmodulation received data signal). It is different. That is, as the magnitude of the DC component of the voltage signal decreases, the magnitude of the preamplified signal output from the preamplifier 180 decreases, and as the magnitude of the DC component of the voltage signal increases, the magnitude of the preamplifier output from the preamplifier 180 increases. The magnitude of the amplified signal increases.

If the magnitude of the DC component of the voltage signal output from the I-V converter circuit 160 is too small, the magnitude of the pre-amplified signal output from the pre-amplifier 180 is also very small, and eventually the main controller 130 AMCC The received data signal cannot be properly recognized. Conversely, if the magnitude of the DC component of the voltage signal output from the I-V converting circuit 160 is too large, it exceeds the amplification range of the preamplifier 180, and distortion occurs in the preamplified signal output from the preamplifier 180. It happens. Accordingly, it is necessary to provide a method for controlling the size of the preamplified signal output from the preamplifier 180, and in the present invention, the preamplification is performed through the AGC amplifier 190 and the AGC amplifier controller 200. control the amplitude of the signal.

Specifically, the AGC amplifier 190 automatically gain-controls the pre-amplified signal output from the pre-amplifier 180 and outputs the automatically-gain-controlled signal. Meanwhile, an appropriate range for the magnitude of the DC component of the voltage signal (or the power of the overmodulation received data signal) may be preset in the AGC amplifier controller 200 . In addition, the AGC amplifier controller 200 may have a preset range for the amplitude of an automatic gain-controlled signal output from the AGC amplifier 190 .

The AGC amplifier controller 200 may receive the DC component of the voltage signal from the I-V converting circuit 160 through direct communication or electrical connection with the I-V converting circuit 160 . In this case, the AGC amplifier controller 200 controls the AGC amplifier 190 so that the level of the automatic gain-controlled signal output from the AGC amplifier 190 is within a preset signal level range, based on the level of the DC component of the voltage signal. ) can be automatically controlled.

For example, when the magnitude of the DC component of the voltage signal (or the power of the overmodulation received data signal) exceeds a preset magnitude range (or preset power range) in the AGC amplifier controller 200, the AGC amplifier The controller 200 controls the gain of the AGC amplifier 190 to be low, so that the level of the automatically gain-controlled signal output from the AGC amplifier 190 is within the preset range (or the preset power range). can

In addition, if the magnitude of the DC component of the voltage signal (or the power of the overmodulation received data signal) is less than the magnitude range (or the preset power range) preset in the AGC amplifier controller 200, the AGC amplifier controller 200 ) can control the gain of the AGC amplifier 190 to be high, so that the magnitude of the automatically gain-controlled signal output from the AGC amplifier 190 exists within the preset magnitude range (or preset power range).

In this way, the AGC amplifier controller 200 automatically controls the gain of the AGC amplifier 190 so that the magnitude of the pre-amplified signal can be controlled as a result. According to the present invention, errors in AMCC received data that occur when the preamplified signal is too small (ie, small signal) and AMCC received data that occurs when the preamplified signal is too large (ie, large signal) It is possible to minimize the distortion of , and accordingly, it is possible to improve the sensitivity of AMCC received data provided by the main controller 130 .

Also, in the present invention, the AGC amplifier controller 200 is configured to automatically control the gain of the AGC amplifier 190 based on the magnitude of the DC component of the voltage signal. According to the present invention, since the output monitor of the conventional optical transceiver is not required, the size of the optical transceiver can be reduced compared to the conventional optical transceiver, and the complexity and cost of the optical transceiver can be reduced. .

The buffer 210 converts the level of the automatically gain-controlled signal into a level of a signal that can be input to the main controller 130, so that the level-converted signal is provided to the main controller 130. At this time, the AMCC received data signal exists in the size-converted signal, and the main controller 130 may demodulate the AMCC received data signal through software or firmware embedded therein.

The AMCC received data signal received by the main controller 130 is the state of the optical transceiver 1000 (the power of the transmission optical signal, the power of the received optical signal, the temperature of the optical transceiver, the temperature of the laser diode provided in the optical transceiver). driving current and driving voltage) or controlling functions of the optical transceiver 1000 (transmission channel change, on/off control of a laser diode included in the optical transceiver, etc.), and furthermore, the optical transceiver It can be used to determine the information of (1000) (model name of the optical transceiver, IDENTIFICATION information of the optical transceiver, etc.).

As described above, the present invention has been described by the limited embodiments and drawings, but the present invention is not limited to the above embodiments, and those skilled in the art in the field to which the present invention belongs can make various modifications and transformation is possible Therefore, the technical spirit of the present invention should be grasped only by the claims, and all equivalent or equivalent modifications thereof will be said to fall within the scope of the technical spirit of the present invention.

[Description of code]

1: Administrator system

110: optical transmission module

120: light receiving module

130: main controller

140: booster circuit

150: current mirror circuit

160: I-V converting circuit

170: low pass filter

180: preamplifier

190: AGC amplifier

200: AGC amplifier controller

210: buffer

1000: optical transceiver

Claims

Receiving a traffic transmission data signal and an Auxiliary Management and Control Channel (AMCC) transmission data signal, generating an over-modulation transmission data signal using the traffic transmission data signal and the AMCC transmission data signal, an optical transmission module outputting a modulated transmission data signal to an external optical transceiver;

an optical receiving module receiving an overmodulation received data signal from the external optical transceiver; and

An AMCC function including a main controller providing the AMCC transmission data signal to the optical transmission module through direct digital communication with the optical transmission module and receiving the AMCC reception data signal included in the overmodulation reception data signal. Optical transceiver having.
According to claim 1,

The main controller performs the digital communication with the optical transmission module through Inter-Integrated Circuit (I2C) communication;

The optical transceiver having an AMCC function, characterized in that the optical transmission module has a digital signal input port for the I2C communication.
According to claim 1,

The main controller modulates the binary signal by one of an On/Off Keying (OOK) modulation method, a Frequency Shift Keying (FSK) modulation method, an Amplitude Shift Keying (ASK) modulation method, and a Phase Shift Keying (PSK) modulation method to obtain the AMCC An optical transceiver with an AMCC function, characterized in that it generates a transmission data signal.
According to claim 1,

The optical transmission module,

an optical transmission module controller receiving the AMCC transmission data signal from the main controller, outputting an LD bias signal, and outputting a gain control signal according to the AMCC transmission data signal;

a laser diode outputting a transmission light signal with a bias set according to the LD bias signal;

a semiconductor optical amplifier receiving the transmission optical signal output from the laser diode and controlling the gain of the transmission optical signal according to the gain control signal to output a gain-controlled transmission optical signal; and

and a modulator generating the overmodulation transmission data signal by overlaying the gain-controlled transmission optical signal on the traffic transmission data signal.
According to claim 1,

a booster circuit providing a light receiving module bias signal to the light receiving module to enable the light receiving module to operate;

a current mirror circuit sensing a current flowing through the light receiving module and outputting a current signal;

an I-V converting circuit converting the current signal into a voltage signal and outputting the voltage signal;

a low-pass filter for performing low-pass filtering on the AC component of the voltage signal and outputting a low-pass filtered signal;

a pre-amplifier for pre-amplifying the low-pass filtered signal and outputting a pre-amplified signal;

an AGC (Automatic Gain Control) amplifier which automatically gain-controls the pre-amplified signal and outputs the automatically-gain-controlled signal to the main controller; and

Based on the magnitude of the DC component of the voltage signal, an AGC amplifier controller for automatically controlling the gain of the AGC amplifier so that the magnitude of the automatically gain-controlled signal output from the AGC amplifier is within a preset signal magnitude range Further comprising , an optical transceiver with AMCC function.
According to claim 5,

The optical transceiver having an AMCC function, further comprising a buffer that converts the level of the automatically gain-controlled signal into a level of a signal that can be input to the main controller so that the level-converted signal is provided to the main controller.