KR100916858B1 - A wavelength division multiplexed-passive optical network using multi-mode laser diodes having a multi-contact - Google Patents

Abstract

The present invention discloses a wavelength division multiplexing passive optical subscriber network using a multimode laser diode with multiple injection electrodes.

The wavelength division multiplexing passive optical network according to the present invention uses a low-noise region of the mode division noise spectrum and uses a spectral efficient transmission format instead of injecting an incoherent light source from the outside to reduce the mode division noise. Therefore, it is possible to economically realize the large capacity of the optical subscriber network and further improve the transmission efficiency. In addition, in the wavelength division multiplexing passive optical subscriber network according to the present invention, a transmission wavelength of a waveguide array grating (AWG) used as a wavelength division multiplexer / demultiplexer according to temperature change and a plurality of injection electrodes are provided. Wavelength division multiplexing by compensating an increase in mode division noise or optical power loss due to a mismatch between the oscillation center wavelengths of a multimode laser diode by adjusting an injection current flowing through an injection electrode of a multimode laser diode having multiple injection electrodes. The passive optical subscriber network can be implemented economically.

Optical Transceiver, Wavelength Division Multiplexing Passive Optical Subscriber Network

Description

A wavelength division multiplexed-passive optical network using multi-mode laser diodes having a multi-contact

The present invention provides a wavelength division multiplexed passive optical network (WDM-PON) which can be economically implemented by using a multimode laser diode having multiple injection electrodes, which are low noise light sources having low noise characteristics in a specific frequency region. Passive Optical Network).

More specifically, the present invention provides a mode partition noise generated when communicating by spectral slicing one or more modes of the outputs of a laser diode having multiple injection electrodes and oscillating in a multimode. In order to reduce the effects of noise, the low noise region on the mode division noise spectrum is used as the data transmission band, and the oscillation center wavelength shift of the laser diode is caused by the external temperature by varying the current injected to the multiple injection electrodes. By using a multimode laser diode with multiple injection electrodes that can solve an increase in mode division noise or a decrease in light output, a wavelength division multiplexing system can be implemented economically without using an incoherent light source. It relates to a passive optical subscriber network.

Current subscriber networks use cable modems using telephone lines or coaxial cables, and these cable modems have great limitations on the transmission distance as well as the bandwidth that can be provided to the subscriber. However, in order to provide subscribers with a triple play service (TPS) integrated with recent video, data, and voice, it is necessary to guarantee a high quality of service (QoS) while providing a bandwidth of 100 Mb / s or more. The WDM-PON has been recognized as the ultimate alternative as a way to provide a subscriber with a bandwidth that is substantially unlimited regardless of the protocol and transmission speed used in the TIPS. In general, since WDM-PON requires the construction of optical fiber as a transmission medium to subscribers in each home, it is necessary to implement low-cost optical transceiver modules and systems in order to provide WDM-PON to subscribers economically. . An example of such a low-cost, wavelength-division multiplex passive optical subscriber network light source was described by Chang-Hee Lee et al. In December 1999 under the name of “Fabric-Perot laser diode light source for wavelength-division multiplex optical communication in which wavelength is submerged in injected non-coherent light” It is disclosed in Korean Patent No. 10-0325687 (hereinafter referred to as "'687 Patent"), filed as Korean Patent Application No. 10-1999-0059923 dated February 21, and registered February 8, 2002. The wavelength-locked Fabry-Perot laser diode (FP LD) disclosed in the '687 patent by Chang-Hee Lee et al. Is a FP LD that oscillates a broadband non-coherent light source (BLS) in multiple modes from the outside. By injecting, FP LD oscillates in a single mode and simultaneously fixes the oscillation wavelength to the wavelength of an incoherent light source, thereby reducing the mode division noise. Doing. At this time, BLS injected into FP LD includes Erbium-Doped Fiber Amplifier (EDFA), Light Emitting Diode (LED), and Super Light Emitting Diode (ASE) that emit Amplified Spontaneous Emission (ASE). Super Luminescent Diode (SLD) can be used, and research on this is ongoing.

In the above-described prior art WDM-PON, the BLS injected from the outside for the wavelength immersion of the F-P LD is mostly an expensive light source, which has been an obstacle to economically implementing the WDM-PON.

Therefore, there is a need for a WDM-PON that can be economically implemented without injecting expensive BLS.

The present invention is to solve the above problems, the present invention is a multi-mode laser diode having a plurality of injection electrodes which is a low noise light source having a low noise characteristics in a specific frequency region without the injection of an external incoherent light source (BLS) It is to provide a wavelength division multiplex passive optical subscriber network that can be economically implemented by using.

More specifically, the present invention uses a low-noise region of the mode division noise spectrum instead of injecting an incoherent light source from the outside to reduce the mode division noise, and uses a transmission format having a spectral efficiency and an optical subscriber network. To achieve high capacity, improve transmission efficiency, and transmit wavelength and multiple injection electrodes of AWG (Arrayed Waveguide Grating) used as wavelength division multiplexer / demultiplexer according to temperature change. Wavelength division multiplexing passive light by compensating an increase in mode division noise or optical power loss due to a mismatch between the oscillation center wavelengths of the mode laser diodes by adjusting the injection current flowing through the injection electrodes of the multimode laser diodes having the multi-injection electrodes. To provide a subscriber network economically.

According to a first aspect of the present invention, in a wavelength division multiplex passive optical subscriber network, a first waveguide array grating located at a telephone station (CO or ONT), having n output ports, and multiplexing / demultiplexing a transmission signal (AWG); N first optical transceivers TRx (OLT1 to OLTn) respectively connected to the first AWG; A second waveguide array grating (AWG), located at a remote node (RN), having n output ports and multiplexing / demultiplexing the transmission signal; A single mode fiber (SMF) connected between the first AWG and the second AWG and used to transmit the transmission signal; N second optical transceivers TRx (ONT1 to ONTn) located at a subscriber (ONT) side and connected to the second AWG, respectively; And n individual transmission single mode optical fiber (SMF) connected between the second AWG and the n second optical transceivers TRx (ONT1 to ONTn), wherein the first optical transceiver TRx ( OLT1 to OLTn and the second optical transceiver (TRx) (ONT1 to ONTn) is a WDM filter to which optical signals of different wavelength bands separated through the first AWG and the second AWG are input, respectively; An optical transmitter (Tx) connected to the WDM filter and transmitting optical signals of different wavelength bands through the WDM filter; And an optical receiver (Rx) connected to the WDM filter and receiving optical signals of different wavelength bands through the WDM filter, wherein the optical transmitter (Tx) has a plurality of injection electrodes, Multi-mode Laser Diodes having a multi-contact; A laser driver circuit for driving the laser diode; And a first mixer (Mixer) for converting a data transmission signal into a transmission format of a specific frequency domain, wherein the optical receiver (Rx) comprises: a photodiode (PD) for converting the optical signal into an electrical signal; A radio frequency (RF) amplifier for amplifying the converted electrical signal; A second mixer (Mixer) for converting the amplified electrical signal to the original transmission format; A low pass filter (LPF) for passing only the spectral region corresponding to the signal component converted into the original data signal; And a clock and data recovery (CDR) to signal-process the signal component filtered by the low pass filter to reproduce the data transmission signal, and to provide a wavelength division multiplex passive optical subscriber network. will be.

According to a second aspect of the present invention, in a wavelength division multiplexing passive optical subscriber network, a first waveguide array grating located at a telephone station (CO or ONT), having n output ports, and multiplexing / demultiplexing a transmission signal (AWG); N first optical transceivers TRx (OLT1 to OLTn) respectively connected to the first AWG; A second waveguide array grating (AWG), located at a remote node (RN), having n output ports and multiplexing / demultiplexing the transmission signal; A single mode fiber (SMF) connected between the first AWG and the second AWG and used to transmit the transmission signal; N second optical transceivers TRx (ONT1 to ONTn) located at a subscriber (ONT) side and connected to the second AWG, respectively; And n individual transmission single mode optical fibers (SMF) connected between the second AWG and the n second optical transceivers TRx (ONT1 to ONTn), and the first optical transceiver TRx (OLT1). To OLTn) and the second optical transceiver (TRx) (ONT1 to ONTn) may each include a WDM filter to which optical signals of different wavelength bands separated through the first AWG and the second AWG are input; An optical transmitter (Tx) connected to the WDM filter and transmitting optical signals of different wavelength bands through the WDM filter; And an optical receiver (Rx) connected to the WDM filter and receiving optical signals of different wavelength bands through the WDM filter, wherein the optical transmitter (Tx) has a plurality of injection electrodes, Multi-mode Laser Diodes having a multi-contact; A laser driver circuit for driving the laser diode; And a first mixer (Mixer) for converting a data transmission signal into a transmission format of a specific frequency domain, wherein the optical receiver (Rx) comprises: an avalanche photodiode (APD) for converting the optical signal into an electrical signal; A second mixer (Mixer) for converting the converted electrical signal into the original transmission format; A low pass filter (LPF) for passing only the spectral region corresponding to the signal component converted into the original data signal; And a clock and data recovery (CDR) for signal-processing the signal component filtered by the low pass filter to reproduce the data transmission signal, and received by the avalanche photodiode (APD). To provide a wavelength division multiplexing passive optical subscriber network in which the optical signal is larger than the minimum current required for the clock and data player (CDR).

Further advantages of the present invention will become apparent from the following description with reference to the accompanying drawings in which like or like reference numerals designate like elements.

In the wavelength division multiplexing passive optical network (WDM-PON) according to the present invention, wavelength division multiplexing is economical by varying the injection current of a multimode laser diode having multiple injection electrodes without injection of an incoherent light source from the outside. The passive optical network can be implemented.

In addition, the wavelength division multiplexing passive optical subscriber network (WDM-PON) according to the present invention is capable of high-speed transmission of 1Gb / s or more when there is sufficient optical power from the optical transmitter to the optical receiver by using a transmission format having high spectral efficiency. Do.

Hereinafter, with reference to the embodiments and the accompanying drawings of the present invention will be described in detail.

1 is a view showing the configuration of a wavelength division multiplexing passive optical subscriber network using a multimode laser diode having multiple injection electrodes according to the present invention.

Referring to FIG. 1, the present invention provides a mobile communication system comprising: a first AWG located in a telephone center (CO) or an optical line termination (OLT), having n output ports, and multiplexing / demultiplexing a transmission signal; N first optical transceivers TRx (OLT1 to OLTn) respectively connected to the first AWG; A second AWG located at a remote node (RN), having n output ports, and multiplexing / demultiplexing the transmission signal; A single mode fiber (SMF) connected between the first AWG and the second AWG and used to transmit the transmission signal; N second optical transceivers TRx (ONT1 to ONTn) located at subscribers (ONTs) and each connected to the second AWG; And a single mode optical fiber for individual transmission connected between the second AWG and the n second optical transceivers TRx (ONT1 to ONTn). As shown in Fig. 1, the telephone station OLT includes a plurality of optical transceivers TRx connected to the first AWG and the second AWG, respectively. The n first optical transceivers TRx (OLT1 to OLTn) located in the telephone station OLT and the n second optical transceivers TRx (ONT1 to ONTn) located in the subscriber ONT are the first AWG and the second AWG, respectively. A WDM filter to which optical signals of different wavelength bands separated through are input, and an optical transmitter (Tx) connected to the WDM filter and transmitting optical signals of different wavelength bands through the WDM filter and the different wavelength bands It consists of a combination of the optical receiver (Rx) for receiving the optical signal through the WDM filter. In addition, as the light source of the optical transmitter Tx, a low noise light source having low noise characteristics is used. As a specific example of such a low noise light source, multi-mode laser diodes having a plurality of injection electrodes are used. The multi-mode laser diode with multiple injection electrodes is driven by a laser driver circuit. The laser driver includes a current control device for controlling the current of the multiple injection electrodes such that the multi-mode laser diode having the multiple injection electrodes described above is matched to a specific oscillation center wavelength. . As described above, in the present invention, instead of compensating for noise deterioration characteristics of the system due to mode division noise by injecting an external incoherent light source (BLS), a multimode laser having multiple injection electrodes as a light source of an optical transmitter is provided. Multi-mode laser diodes having multiple injection electrodes, but using a diode, use a low-noise region as a transmission band in a spectrum having a relative intensity noise (RIN), and use a transmission format with a spectral efficiency that is economical. It enables the large capacity of the subscriber network and improves the transmission efficiency.

To this end, in the embodiment of the present invention shown in FIG. 1, a non-return to zero (NRZ) data transmission signal is described in FIG. 3, which will be described later in FIG. 3. A first mixer is used to use the Binary Phase Shift Keying (BPSK) format method. A first mixer externally mixes a carrier frequency of f1 with the NRZ data transmission signal and up-converts the NRZ data signal to thereby transmit a specific format. Convert to In the embodiment of the present invention, 750 MHz is used as the carrier frequency f1. In addition, the optical transmitter Tx according to the present invention uses a band pass filter between the laser driver circuit and the first mixer to limit the frequency band of the transmission format of the NRZ data transmission signal to only a desired bandwidth. It may further include a BPF (Band Pass Filter).

Meanwhile, the optical receiver Rx includes a photo diode (PD) for receiving an optical signal. Although an embodiment of the present invention describes the use of a PD, those skilled in the art will fully understand that an Avalanche Photo Diode (APD) having excellent reception sensitivity may be used. The PD converts the received optical signal into an electrical signal, and the converted electrical signal passes through an RF amplifier. The RF amplifier amplifies the converted electrical signal to the minimum electrical signal required for the second mixer. Thereafter, the second mixer (Mixer) down-converts the amplified electric signal using a carrier frequency f1 that is the same as the carrier frequency used in the optical transmitter (Tx) to down-convert (down-conversion) the specific baseband. Convert to original transmission format with frequency band. Then, the signal having the converted baseband frequency band is filtered by a low pass filter (LPF) so that only the required signal band is passed. The filtered signal is then signal processed by a clock and data recovery (CDR) and then reproduced into the originally transmitted NRZ data transmission signal. An avalanche photodiode (APD) having excellent reception sensitivity is used instead of the above-described photodiode (PD), and the RF for amplifying the received signal when the received signal is greater than the minimum current required for the clock and data regenerator (CDR). The amplifier may be omitted.

Although the embodiment of the present invention shown in FIG. 1 describes the configuration and principle of a wavelength division multiplexing passive optical subscriber network, those skilled in the art will fully understand that such an embodiment of the present invention is applicable to a general optical communication system.

2 is an example of a multimode laser diode having multiple injection electrodes according to an embodiment of the present invention, and a spectrum of an AWG used for multiplexing / demultiplexing and a multimode laser diode having two injection electrodes. Figure is a diagram.

2, the solid line represents the spectrum of a multimode laser diode with two injection electrodes used in the embodiment of the present invention, and the dotted line represents the spectrum of the AWG used for multiplexing / demultiplexing. In the embodiment of the present invention, an AWG having a pass band having a flat-top shape and having a 3 dB bandwidth of approximately 0.9 nm is used.

FIG. 3 illustrates an injection current value of a multimode laser diode when the multimode laser diode including two injection electrodes according to the exemplary embodiment of the present invention described with reference to FIG. 2 is filtered with the AWG described with reference to FIG. 2. Is a diagram illustrating measured RIN values.

Referring to FIG. 3, RIN values are shown when operating at driving currents of 1.6, 1.8, and 2.0 times the threshold current (Ith) values of a multi-mode laser diode having two injection electrodes, respectively. As can be seen in FIG. 3, while the RIN value is high in the low frequency band of about 300 MHz or less, the RIN value decreases as the frequency band increases. Therefore, as described with reference to FIG. 1, when using the BPSK transmission format using a high frequency band except for a low frequency band of about 300 MHz or less as a transmission band, mode division without injection of an external incoherent light source (BLS) Deterioration characteristics due to noise can be improved. Although the present invention describes the use of the BPSK transmission format as a spectral efficient transmission format, a person skilled in the art may, for example, use a quadrature phase shift keying (QPSK) scheme as another spectral efficient transmission format. It will be appreciated that quadrature amplitude modulation (QAM) schemes, 64-orthogonal amplitude modulation (QAM) schemes, or 256-orthogonal amplitude modulation (QAM) schemes may also be applied to the present invention.

4 is a diagram illustrating slicing loss (upper graph) and RIN value (lower graph) according to wavelength mismatch between a multimode laser diode having two injection electrodes and an AWG according to an embodiment of the present invention. .

 The AWG used for multiplexing / demultiplexing according to the embodiment of the present invention shown in FIG. 4 is a non-thermal conductivity type, but does not change with temperature, but the optical transmitter (Tx) of each OLT or ONT shown in FIG. In the case of a laser diode used for), the maximum wavelength of the laser output varies according to the external temperature. In general, the maximum gain of a laser diode is known to shift toward longer wavelengths at a rate of 0.5 nm / 占 폚. If the change in temperature is large, the difference between the wavelength filtered by the AWG and the wavelength with the maximum gain of the laser diode becomes very large. As a result, not only does the power loss of the output light of the laser diode be filtered by the AWG, but also the noise characteristic of the output light after being filtered by the AWG is also degraded. The characteristic according to the difference between the wavelength with the maximum gain of the laser diode used and the wavelength of the AWG is shown in FIG. 4. In the graph of FIG. 4, the left vertical axis represents the wavelength of the AWG minus the wavelength with the maximum gain of the laser diode (ie, the difference between the wavelength value of the AWG and the wavelength value with the maximum gain of the laser diode). In this case, the definition of the wavelength value with the maximum gain of the laser diode is referred to GR-468-CORE, Section 5.1, which is defined in the International Standard Specification of Telcordia Technologies. The equation for the wavelength value having the maximum gain of the laser diode defined in this international standard is given by Equation 1 below.

Central Wavelength (λ _c nm) = (Σλ _i xP _i ) / ΣP _i ...... (1)

In Equation (1), λ _i is the wavelength of the i-th peak, and P _i is the power of the i-th peak.

In the case of using the above Equation 1 and considering the optical power required from the optical transmitter to the optical receiver, including the SMF, in order to transmit data at a rate of 155 Mbps in the embodiment of the present invention shown in FIG. Less than -96.2 dB / Hz is required. In this case, the power budget from the transmitting end (output power: -4 dBm) to the receiving end acts as an important factor. The power budget is, for example, the loss due to two AWGs (10 dB), the loss due to SMF (at 20 km) (5.5 dB) in the WDM-PON of FIG. It can be calculated by the loss (0.5 dB) and the slicing loss by the two AWGs). Considering the receiver sensitivity (-34 dBm), the possible slicing loss is approximately 14 dB. Therefore, referring to the upper graph showing the slicing loss shown in Fig. 4, it is easily understood that the wavelength value having the maximum gain of the laser diode should be adjusted within the detuning range of -2.0 nm to +1.0 nm. Can be.

In addition, a bandwidth narrower than the bandwidth of the AWG described in the embodiment illustrated in FIG. 4 of the present invention (for example, a flat-top AWG of 100 GHz has a value of 0.60 nm as a bandwidth, and a Gaussian AWG of 100 GHz is used as a bandwidth). AWG having a value of 0.45 nm is used as a multiplexer / demultiplexer, the slicing loss is further increased. In this case, an optical amplifier such as an Erbium-doped fiber amplifier (EDFA) used as an amplifier in general optical communication at the front end of the receiver (i.e., the position between the PD and WDM at the receiver end of the OLT and ONT). ) To compensate for slicing losses. Furthermore, in the case of transmitting high speed data of 1.25 Gb / s, high speed transmission is possible when compensating the slicing loss described above using an optical amplifier.

Meanwhile, a method for fixing the wavelength value having the maximum gain of a multimode laser diode having two injection electrodes as shown in the embodiment of the present invention shown in FIG. 4 is described by Lee Chang-Hee et al. Korean Patent Application No. 10-2005-0007643 filed Jan. 27, 2005, entitled "wavelength control device using a ferot laser diode," and disclosed in Korean Patent No. 0680918, registered February 2, 2007. It is. At least three or more electrodes disclosed in the patent of the above patent No. 0680918 include one ground electrode and two or more injection electrodes.

FIG. 5 shows the characteristics of bit error rate (BER) according to temperature in a wavelength division multiplexing passive optical subscriber network when a multimode laser diode having two injection electrodes according to an embodiment of the present invention is used as an optical transmitter. FIG. Figure is a diagram. More specifically, Figure 5 uses a multi-mode laser diode having two injection electrodes according to an embodiment of the present invention as a light source of the optical transmitting end of the wavelength division multiplexing passive optical subscriber network, and also proposed by the present invention As shown in the drawing, the BER is varied according to temperature when the injection current is varied at two injection electrodes so that the wavelength of the multimode laser diode is always fixed to the center wavelength of the AWG.

In the embodiment of the present invention shown in FIG. 5, a data rate of 155 Mbps was used, and BER was measured at 5 ° C intervals in a temperature range of 20 ° C and 40 ° C. In this case, a target BER of 10 ^-10 ( ^-10 as a log value shown in FIG. 5) can be obtained within the measured temperature range when transmitted at a data rate of 155 Mb / s. Thus, referring to FIG. 5, it can be seen that an error-free transmission characteristic is obtained in the measured temperature range.

In the wavelength division multiplexing passive optical network (WDM-PON) according to the present invention, wavelength division multiplexing is economical by varying the injection current of a multimode laser diode having multiple injection electrodes without injection of an incoherent light source from the outside. Method Passive optical particle network can be realized.

In addition, the wavelength division multiplexing passive optical subscriber network (WDM-PON) according to the present invention uses a transmission format having a high spectral efficiency, so that high-speed transmission of 1 Gb / s or more is sufficient when the optical power from the optical transmitter to the optical receiver is sufficient. It is possible.

In addition, the wavelength division multiplexing passive optical subscriber network according to the present invention can be applied to a general optical communication system.

As various modifications may be made in the constructions and methods described and illustrated herein without departing from the scope of the present invention, it is intended that all matter contained in the above description or shown in the accompanying drawings be exemplary, and not intended to limit the invention. It is not. Therefore, the scope of the present invention should not be limited by the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.

1 is a view showing the configuration of a wavelength division multiplexing passive optical subscriber network using a multimode laser diode having multiple injection electrodes according to the present invention.

2 is an example of a multimode laser diode having multiple injection electrodes according to an embodiment of the present invention, and a spectrum of an AWG used for multiplexing / demultiplexing and a multimode laser diode having two injection electrodes. Figure is a diagram.

FIG. 3 illustrates an injection current value of a multimode laser diode when the multimode laser diode including two injection electrodes according to the exemplary embodiment of the present invention described with reference to FIG. 2 is filtered with the AWG described with reference to FIG. 2. Is a diagram illustrating measured RIN values.

4 is a diagram illustrating slicing loss (upper graph) and RIN value (lower graph) according to a wavelength mismatch between a multimode laser diode having two injection electrodes and an AWG according to an embodiment of the present invention. to be.

FIG. 5 shows the characteristics of bit error rate (BER) according to temperature in a wavelength division multiplexing passive optical subscriber network when a multimode laser diode having two injection electrodes according to an embodiment of the present invention is used as an optical transmitter. FIG. Figure is a diagram.

Claims (17)

In a wavelength division multiplex passive optical subscriber network, A first waveguide array grating (AWG), located in a telephone station (CO or ONT), having n output ports and multiplexing / demultiplexing transmission signals; N first optical transceivers TRx (OLT1 to OLTn) respectively connected to the first AWG;  A second waveguide array grating (AWG), located at a remote node (RN), having n output ports and multiplexing / demultiplexing the transmission signal; A single mode fiber (SMF) connected between the first AWG and the second AWG and used to transmit the transmission signal; N second optical transceivers TRx (ONT1 to ONTn) located at a subscriber (ONT) side and connected to the second AWG, respectively; And N individual transmission single mode optical fibers (SMF) connected between the second AWG and the n second optical transceivers TRx (ONT1 to ONTn) Including, The first optical transceiver TRx (OLT1 to OLTn) and the second optical transceiver TRx (ONT1 to ONTn) are respectively A WDM filter to which optical signals of different wavelength bands separated through the first AWG and the second AWG are input;  An optical transmitter (Tx) connected to the WDM filter and transmitting optical signals of different wavelength bands through the WDM filter; And An optical receiver (Rx) connected to the WDM filter and receiving optical signals of different wavelength bands through the WDM filter; Including; The optical transmitter Tx A multi-mode laser diode having a multi-contact and having a plurality of injection electrodes; A laser driver circuit for driving the laser diode; And First mixer for converting the data transmission signal into a transmission format of a specific frequency domain Including, The optical receiver (Rx) is A photodiode (PD) for converting the optical signal into an electrical signal; A radio frequency (RF) amplifier for amplifying the converted electrical signal; A second mixer (Mixer) for converting the amplified electrical signal to the original transmission format; A low pass filter (LPF) for passing only the spectral region corresponding to the signal component converted into the original data signal; And Clock and Data Recovery (CDR) for signal processing the signal components filtered by the low pass filter to reproduce the data transmission signal Containing Wavelength Division Multiplexing Passive Optical Subscriber Network. The method of claim 1, The optical transmitter Tx is connected between the laser drive circuit and the first mixer and further includes a band pass filter (BPF) for limiting the spectral band of the transmission format of the data transmission signal to only a desired bandwidth. Wavelength division multiplexing passive optical network including. The method according to claim 1 or 2, The laser diode is a wavelength division multiplex passive optical network using a low-noise region on the mode division noise spectrum as a transmission band of the data transmission signal, and using a transmission format having a spectral efficiency. The method of claim 3, wherein The spectral efficient transmission formats include Quadrature Phase Shift Keying (QPSK), 16-Orthogonal Amplitude Modulation (QAM), 64-Orthogonal Amplitude Modulation (QAM), and 256-Orthogonal Amplitude Modulation (QAM). Wavelength division multiplexing passive optical subscriber network. The method according to claim 1 or 2, And the laser driving circuit includes a current controller for controlling the current of the multiple injection electrodes to match the laser diode with a specific oscillation center wavelength. The method of claim 3, wherein And the laser driving circuit includes a current controller for controlling the current of the multiple injection electrodes to match the laser diode with a specific oscillation center wavelength. The method of claim 4, wherein And the laser driving circuit includes a current controller for controlling the current of the multiple injection electrodes to match the laser diode with a specific oscillation center wavelength. The method according to claim 1 or 2, The photodiode (PD) is a wavelength division multiplexing passive optical network implemented by an avalanche photodiode (APD). The method of claim 3, wherein The photodiode (PD) is a wavelength division multiplexing passive optical network implemented by an avalanche photodiode (APD). The method of claim 4, wherein The photodiode (PD) is a wavelength division multiplexing passive optical network implemented by an avalanche photodiode (APD). The method according to claim 1 or 2, The first mixer externally mixes a carrier frequency of f1 with the data transmission signal to up-convert the data transmission signal. The second mixer (Dixer) to down-convert (down-conversion) the amplified electrical signal using the carrier frequency (carrier frequency) of the f1 to convert the original data transmission signal Wavelength Division Multiplexing Passive Optical Subscriber Network. The method of claim 3, wherein The first mixer externally mixes a carrier frequency of f1 with the data transmission signal to up-convert the data transmission signal. The second mixer (Dixer) to down-convert (down-conversion) the amplified electrical signal using the carrier frequency (carrier frequency) of the f1 to convert the original data transmission signal Wavelength Division Multiplexing Passive Optical Subscriber Network. The method of claim 4, wherein The first mixer externally mixes a carrier frequency of f1 with the data transmission signal to up-convert the data transmission signal. The second mixer (Dixer) to down-convert (down-conversion) the amplified electrical signal using the carrier frequency (carrier frequency) of the f1 to convert the original data transmission signal Wavelength Division Multiplexing Passive Optical Subscriber Network. The method according to claim 1 or 2, When the first AWG and the second AWG are each an AWG having a channel spacing of 100 GHz or less, the wavelength division multiplexing passive type further includes a predetermined optical amplifier in front of each WDM filter. Optical subscriber network. The method of claim 3, wherein When the first AWG and the second AWG are each an AWG having a channel spacing of 100 GHz or less, the wavelength division multiplexing passive type further includes a predetermined optical amplifier in front of each WDM filter. Optical subscriber network. The method of claim 4, wherein When the first AWG and the second AWG are each an AWG having a channel spacing of 100 GHz or less, the wavelength division multiplexing passive type further includes a predetermined optical amplifier in front of each WDM filter. Optical subscriber network. In a wavelength division multiplex passive optical subscriber network, A first waveguide array grating (AWG), located in a telephone station (CO or ONT), having n output ports and multiplexing / demultiplexing transmission signals; N first optical transceivers TRx (OLT1 to OLTn) respectively connected to the first AWG;  A second waveguide array grating (AWG), located at a remote node (RN), having n output ports and multiplexing / demultiplexing the transmission signal; A single mode fiber (SMF) connected between the first AWG and the second AWG and used to transmit the transmission signal; N second optical transceivers TRx (ONT1 to ONTn) located at a subscriber (ONT) side and connected to the second AWG, respectively; And N individual transmission single mode optical fibers (SMF) connected between the second AWG and the n second optical transceivers TRx (ONT1 to ONTn) Including, The first optical transceiver TRx (OLT1 to OLTn) and the second optical transceiver TRx (ONT1 to ONTn) are respectively A WDM filter to which optical signals of different wavelength bands separated through the first AWG and the second AWG are input;  An optical transmitter (Tx) connected to the WDM filter and transmitting optical signals of different wavelength bands through the WDM filter; And An optical receiver (Rx) connected to the WDM filter and receiving optical signals of different wavelength bands through the WDM filter; Including; The optical transmitter Tx A multi-mode laser diode having a multi-contact and having a plurality of injection electrodes; A laser driver circuit for driving the laser diode; And First mixer for converting the data transmission signal into a transmission format of a specific frequency domain Including, The optical receiver (Rx) is An avalanche photo diode (APD) for converting the optical signal into an electrical signal; A second mixer (Mixer) for converting the converted electrical signal into the original transmission format; A low pass filter (LPF) for passing only the spectral region corresponding to the signal component converted into the original data signal; And Clock and Data Recovery (CDR) for signal processing the signal components filtered by the low pass filter to reproduce the data transmission signal Including; The optical signal received at the avalanche photodiode (APD) is greater than the minimum current required for the clock and data regenerator (CDR). Wavelength Division Multiplexing Passive Optical Subscriber Network.

Images