WO2014022971A1

WO2014022971A1 - Externally modulated laser, passive optical communication apparatus and system

Info

Publication number: WO2014022971A1
Application number: PCT/CN2012/079780
Authority: WO
Inventors: 周小平
Original assignee: 华为技术有限公司
Priority date: 2012-08-07
Filing date: 2012-08-07
Publication date: 2014-02-13
Also published as: CN102906949A; CN102906949B

Abstract

An externally modulated laser, a passive optical communication apparatus and system. The externally modulated laser comprises a laser which includes a partially reflecting mirror (113), a gain medium (112) and a filter (114); the partially reflecting mirror (113), the gain medium (112) and the filter (114) form a laser oscillating cavity of the laser; the filter (114) is used to filter the light from the gain medium (112) to provide a light with predetermined wavelength; the partially reflecting mirror (113) is used to transmit a part of the light with predetermined wavelength to a modulator for externally modulating and reflect the other part of the light with predetermined wavelength to the gain medium (112). The existing problem of large power consumption of externally laser is solved.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to optical fiber communication technologies, and more particularly to an external modulation laser, a passive optical communication device, and a system. Background technique

In the optical fiber communication technology, 10Gb/s externally modulated laser (EML) is widely used. Among them, the electroabsorption modulation laser is the most typical device due to its small size and fast modulation speed, and is the key device for the next generation of the access network. . According to the international standard ITU-T G987.3, the wavelength range of XG-PON is between 1575 and 1580 nm. The electroabsorption modulation laser is mainly composed of two parts: a distributed feedback (DFB: Distributed Feedback) laser and an electroabsorption modulator (EAM: Electra-absorption Modulator), a DFB laser for generating a continuous laser, and an electroabsorption modulator for high speed. The electrical signal is converted into a high speed optical signal.

In order to ensure that the electroabsorption modulation laser operates in the range of 1575 to 1580 nm specified by the International Standards Organization, a refrigerator is installed in the DFB laser to keep the DFB laser operating at a fixed temperature, and the refrigerator additionally increases the work of the laser module. Consumption. Summary of the invention

Embodiments of the present invention provide an external modulation laser, a passive optical communication device, and a system, which can reduce power consumption of an externally modulated laser.

In a first aspect, an embodiment of the present invention provides an external modulation laser, including:

a laser comprising a partial mirror, a gain medium, and a filter;

The partial mirror, the gain medium and the filter constitute a laser oscillation cavity of the laser; the filter is configured to filter the light emitted by the gain medium to generate a light wave of a preset wavelength;

The partial mirror is configured to transmit a portion of the generated predetermined wavelength light wave to a modulator for external modulation, and to convert another portion of the generated predetermined wavelength light wave back to the gain medium.

In a first possible implementation manner, the laser further includes: A total reflection mirror disposed at a rear end of the gain medium for reflecting light emitted from a rear end of the gain medium back to the gain medium.

According to a first possible implementation manner, in a second possible implementation, the total reflection mirror is coupled to the gain medium to form a reflective gain medium, and the partial mirror is coupled to the filter to form a partial reflection Type filter.

According to a first possible implementation manner, in a third possible implementation, the total reflection mirror is coupled to the filter to form a reflection type filter, and the partial reflection mirror is coupled to the gain medium to form a partial reflection Type gain medium.

Based on the first, second or third possible implementation manner, in a fourth possible implementation, the filter comprises a thin film filter.

Based on the first, second, third or fourth possible implementation manner, in a fifth possible implementation manner, the external modulation laser further includes:

A beam splitter is located between the laser and the modulator for splitting the light wave output by the laser into at least two light waves.

In the sixth possible implementation manner, the external modulation laser further includes: a modulator array, where the modulator array includes at least the first, second, third, fourth, or fifth possible implementation manners Two modulators, the number of modulators included in the modulator array being the same as the number of paths of the output light waves of the beam splitter;

The modulator array is configured to separately modulate each of the light waves output by the beam splitter into corresponding optical signals.

In the seventh possible implementation manner, the external modulation laser further includes: an amplifier array, where the amplifier array is at least based on the first, second, third, fourth, fifth, or sixth possible implementation manners Two amplifiers are included, the number of amplifiers included in the amplifier array being the same as the number of paths of the output light waves of the splitter.

Based on the first, second, third, fourth, fifth, sixth or seventh possible implementation manners, in an eighth possible implementation, the amplifier array is located in the optical splitter and the modulation Between the arrays of the arrays, the amplifier arrays are used to amplify the respective optical waves output by the optical splitters.

In a ninth possible implementation manner, the amplifier array is located after the modulator array, based on the first, second, third, fourth, fifth, sixth, and seventh possible implementation manners. The amplifier array is configured to perform amplification processing on each of the optical signals modulated by the modulator array.

Based on the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth possible implementation manners, in a tenth possible implementation, the amplifier array is coupled to the The modulator array.

Based on the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth or tenth possible implementation manners, in an eleventh possible implementation manner, the laser And an optical fiber connection between the optical splitter, the amplifier array, and the modulator array.

Based on the first, second, third, fourth, fifth, sixth, seventh, eighth, ninth or tenth possible implementation manners, in a twelfth possible implementation manner, the laser And a planar optical waveguide connection between the optical splitter, the amplifier array and the modulator array.

In a second aspect, an embodiment of the present invention provides a passive optical communication device, including: the external modulation laser.

The fiber optic communication device includes an optical line terminal or an optical network unit.

In a third aspect, an embodiment of the present invention provides a passive optical network system, including: an optical line terminal located at a central control station, and a plurality of optical network units located at a user side, the optical line terminal and the optical network unit Perform fiber optic communication;

The optical line terminal includes the above external modulation laser;

The optical network unit includes the above-described externally modulated laser.

The external modulation laser of the embodiment adopts a temperature-insensitive filter, and the light emitted by the gain medium is filtered to generate a light wave of a preset wavelength, which can realize stable output of the optical signal without installing a refrigerator. The power consumption of the externally modulated laser is reduced, the hardware cost is reduced, and the problem of large power consumption of the existing externally modulated laser is solved. BRIEF DESCRIPTION OF THE DRAWINGS In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. The drawings are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive labor.

1 is a schematic structural diagram of a laser in an externally modulated laser according to an embodiment of the present invention; 2 is a schematic structural diagram of an external modulation laser according to another embodiment of the present invention; FIG. 3 is a schematic structural diagram of a specific implementation of the external modulation laser shown in FIG. 2; FIG. 5 is a schematic structural view showing still another specific implementation of the external modulation laser shown in FIG. 2. FIG. 6 is a schematic structural view showing another specific implementation of the external modulation laser shown in FIG. The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. The embodiments are a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Existing electroabsorption modulated lasers are mainly composed of a DFB laser and an electroabsorption modulator. A DFB laser is used to generate a continuous laser, and an electroabsorption modulator is used to convert a high-speed electrical signal into a high-speed optical signal.

Among them, the DFB grating in the DFB laser determines the wavelength of the laser generated by the DFB laser. The DFB grating is susceptible to temperature and the temperature tuning factor is approximately 0.08 nm/K, ie the temperature changes by 1 degree and the wavelength changes by 0.08 nm. General industrial lasers are required to operate in the range of -40 to 85 degrees. If there is no temperature control, the wavelength of the DFB laser will vary by about 10 nm, far exceeding the standard requirements of 10G PON. In order to ensure that the electroabsorption modulation laser operates in the range of 1575 to 1580 nm specified by the International Standards Organization, a refrigerator is installed in the DFB laser to keep the DFB laser operating at a fixed temperature, and the refrigerator additionally increases the work of the laser module. Consumption.

In view of the above problems in the prior art, the present invention provides a method capable of reducing the power consumption of an externally modulated laser.

The externally modulated laser provided by the present invention includes a laser and a modulator for generating a light wave of a predetermined wavelength, and a modulator for converting the electrical signal into an optical signal. In order to reduce the power consumption of the externally modulated laser, the laser is improved, that is, the laser of the present invention uses a temperature-insensitive filter to replace the DFB grating in the original EML, so that the wavelength of the laser is insensitive to changes in the external temperature, thereby There is no need to install additional chillers in the laser to reduce the power consumption of the externally modulated laser. 1 is a schematic structural diagram of a laser in an externally modulated laser according to an embodiment of the present invention, including: a total reflection mirror 11 , a gain medium 112 , a partial mirror 113 , and a filter 1 14 ;

The total reflection mirror 11 1 , the gain medium 112 , the partial mirror 1 13 , and the filter 1 14 constitute a laser oscillation chamber of the laser.

The working principle of the laser will be described below. After the light from the gain medium 1 12 is filtered by the filter 114, only the light matching the pass band of the filter 114 can pass, and the light outside the pass band is attenuated, so that the light of the predetermined wavelength can be generated. The light passing through the filter 114 is transmitted to a partial mirror, wherein a part of the light is transmitted through the partial mirror 113, and the other portion of the light is reflected back by the partial mirror 113, and is reinjected back into the gain medium 1 12 through the gain medium 112. The amplification, the injected light is transmitted to the total reflection mirror 11 1 , reflected back by the total reflection mirror 11 , re-injected into the gain medium 112, and then amplified by a gain and transmitted to the filter 114. The above process can be considered to complete a complete oscillation. According to the working principle of the gain medium, after multiple complete oscillations, the light of the corresponding wavelength with the filter passband is continuously strengthened. When the enhancement is to a certain extent, the gain of the gain medium is saturated. In the end, it will reach a stable state of stable work.

It should be noted that the pass band of the filter 1 14 can be specifically set according to the wavelength of the actually required light wave.

It should be noted that the operating wavelength of the laser of this embodiment is mainly determined by the filter 114, and does not require any wavelength calibration and stabilization mechanism. Therefore, the laser of the embodiment is simple and easy to use, and the cost is low.

In an alternative embodiment of the invention, the filter 114 includes, but is not limited to, a thin film filter. It should be noted that the function of the filter of the present embodiment can be implemented by any temperature insensitive filtering module.

In an alternative embodiment of the invention, total reflection mirror 111 and gain medium 112 may be coupled together to form a reflective gain medium, such as a Reflective Semiconductor Optical Amplifier (RSOA). Alternatively, the partial mirror 113 and the filter 14 may be coupled together to form a reflective filter, such as a partially reflected Fiber Bragg Grating (FBG).

In an alternative embodiment of the invention, total reflection mirror 11 1 and filter 14 14 may be coupled together to form a reflective filter, and partial mirror 113 and gain medium 112 may be coupled together to form a partially reflective gain. medium. The external modulation laser of the embodiment adopts a temperature-insensitive filter, and the light emitted by the gain medium is filtered to generate a light wave of a preset wavelength, which can realize stable output of the optical signal without installing a refrigerator. The power consumption of the externally modulated laser is reduced, the hardware cost is reduced, and the problem of large power consumption of the existing externally modulated laser is solved.

2 is a schematic structural diagram of an external modulation laser according to another embodiment of the present invention. Further, the external modulation laser of the embodiment includes: a laser 11, a modulator array 12, and a beam splitter 13 according to the laser of FIG. .

The laser 11 is the laser described in the embodiment of Fig. 1. The composition and working principle of the laser 11 are described in detail with reference to the embodiment shown in Fig. 1.

In an alternative embodiment of the invention, the beam splitter 13 is located in the laser 11 and the modulator array

Between 12, the light wave for outputting the laser 11 is divided into at least two light waves. It should be noted that, in this embodiment, the number of optical paths that need to be output can be determined according to the actual required output optical power.

The beam splitter 13 includes, but is not limited to, a multi-mode interferometer (MMI). For example, the beam splitter 13 may also employ a cascaded Y-branch.

In an optional embodiment of the present invention, the modulator array 12 includes at least two modulators, and the number of modulators included in the modulator array is the same as the number of paths of the output light waves of the beam splitter 13; wherein, the modulator array 12 For modulating each of the light waves output by the beam splitter 13 into corresponding optical signals.

The modulator in modulator array 12 can be an electroabsorption modulator (Electra-absorption)

The Modulator, ΕΑΜ), may also be a ΜΖ interferometric modulator, which is not limited in the present invention.

In an optional embodiment of the present invention, the externally modulated laser of the present embodiment further includes: an amplifier array 14. The amplifier of the embodiment includes, but is not limited to, a semiconductor optical amplifier.

The amplifier array 14 includes at least two amplifiers for amplifying the respective optical waves to meet the requirements of a specific output optical power, and the number of amplifiers included in the amplifier array 14 is the same as the number of paths of the output optical waves of the optical splitter 13.

It should be noted that the gain of the amplifier of this embodiment can be dynamically adjusted as the external temperature changes, thereby compensating for the influence of the temperature change on the laser.

In an optional embodiment of the present invention, the amplifier array 14 is located between the beam splitter 13 and the modulator array 12, specifically for amplifying each of the light waves output by the beam splitter 13; In an optional embodiment of the present invention, the amplifier array 14 is located after the modulator array 12, and is specifically configured to perform amplification processing on each of the optical signals modulated by the modulator array 12.

The above array of amplifiers can be coupled to the modulator array or separately.

In an optional embodiment of the present invention, the laser 11, the modulation array 12, the optical splitter 13, and the amplifier array 14 may be connected by an optical fiber, or may be connected by a Planar lightwave circuit (PLC). For example, the laser 1 1 , the modulation array 12 , the beam splitter 13 , and the amplifier array 14 are integrally coupled into a PLC chip including, but not limited to, silicon dioxide SiO 2 , polymer polymer, and silicon Si.

The external modulation laser of the embodiment uses a beam splitter to split the optical wave outputted by the laser into multiple optical waves to realize the output of the multiple optical waves. Further, in this embodiment, an amplifier array is used, and each optical wave is separately amplified, thereby achieving Separate power control for each light wave.

At the same time, the embodiment adopts the PLC technology to integrally package the devices in the external modulation laser, thereby reducing the manufacturing cost, reducing the size of the external modulation laser, and facilitating the support of more ports in the same line card.

3 is a schematic structural diagram of a specific implementation of the external modulation laser shown in FIG. 2, as shown in FIG. 3, specifically including: semiconductor optical amplifier RSOA, reflective filter, optical splitter, multimode interferometer MMI, optical amplifier SOA Array and Modulator (MOD) array; wherein the semiconductor optical amplifier RSOA consists of a total reflection mirror and a gain medium, the reflection filter consists of a total reflection mirror and a 1577 nm thin film filter, a semiconductor optical amplifier RSOA and a reflective filter. The chip constitutes the laser oscillating cavity of the laser.

The light output by the laser is led out by the splitter and enters the MMI of the multimode interferometer. It is divided into multiple optical waves, for example, divided into four optical waves. Each optical wave is amplified and modulated by the optical amplifier SOA array and the modulator MOD array, respectively. Road light signal output.

In an optional embodiment of the present invention, the modulator MOD includes but is not limited to an electroabsorption modulator or an MZ interferometric modulator, if the modulator MOD uses an MZ interferometric modulator, and the PLC chip uses silicon Si, MZ interference type The modulator can be fabricated directly in the PLC chip without the need for remixing.

In an alternative embodiment of the invention, the array of optical amplifier SOAs and the array of modulators MOD may be coupled together or separately.

It should be noted that each device in the above externally modulated laser is integrated and packaged in a PLC chip. On. The semiconductor optical amplifier RSOA can be coupled to the upper and lower sides of the passive waveguide of the PLC chip through the flip chip Flip chip, or the edge coupling can be performed by the end face coupling Butt coupling. The 1577nm thin film filter can be directly attached to the edge of the PLC chip, perpendicular to the output waveguide, or the lens can be added between the 1577nm thin film filter and the PLC chip to improve the coupling efficiency.

The external modulation laser of the embodiment adopts a temperature-insensitive 1577 nm thin film filter, and the light emitted from the gain medium is filtered to generate a light wave of 1577 nm wavelength, which is divided into multiple optical waves and output to the amplifier array and the modulator after passing through the optical splitter. The array performs amplification and modulation processing on each of the optical waves to achieve separate power control and optical power output for each optical wave.

The external modulation laser of this embodiment does not need to install an additional chiller, which reduces the power consumption of the externally modulating laser, and the external modulation laser of the embodiment can realize the wavelength and power even in the case where the temperature environment varies greatly. The stable output improves the stability of the working performance of the externally modulated laser.

At the same time, the embodiment adopts the PLC technology to integrally package the devices in the external modulation laser, thereby reducing the manufacturing cost, simplifying the packaging process, reducing the size of the external modulation laser, and facilitating the support of more ports in the same line card.

4 is a schematic structural diagram of still another specific implementation of the external modulation laser shown in FIG. 2, as shown in FIG. 4, specifically including: a semiconductor optical amplifier RSOA, a reflective filter, a multimode interferometer MMI, an optical amplifier SOA array, and Modulator MOD array;

Among them, the semiconductor optical amplifier RSOA is composed of a partial mirror and a gain medium, the reflective filter is composed of a total reflection mirror and a 1577 nm thin film filter, the reflective filter and the RSOA are directly aligned, the semiconductor optical amplifier RSOA and the reflective filter The laser oscillating cavity that makes up the laser.

The light from the gain medium in the semiconductor optical amplifier RSOA is filtered by a thin film filter of 1577 nm to generate a light wave with a wavelength of 1577 nm. The total reflection mirror in the reflective filter is totally reflected back to the gain medium, and part of the light wave is transmitted through the portion of the RSOA. The mirror is output to the multimode interferometer MMI and is divided into multiple optical waves, for example, divided into four optical waves. Each optical wave is amplified and modulated by the optical amplifier SOA array and the modulator MOD array, and then divided into four optical signals for output.

In an alternative embodiment of the invention, the array of optical amplifier SOA and the array of modulators MOD may be coupled together or separately.

It should be noted that the above devices are all integrated and packaged on the PLC chip. FIG. 5 is a schematic structural diagram of still another specific implementation of the external modulation laser shown in FIG. 2, as shown in FIG. 5, specifically including: an RSOA array, a reflective filter, and a modulator MOD array.

The RSOA array includes at least two RSOAs, each of which consists of a partial mirror and a gain medium. The reflective filter consists of a total reflection mirror and a 1577 nm thin film filter. The reflective filter and the RSOA array are directly aligned, RSOA. The array and the reflective filter form a laser. It should be noted that in order to satisfy the output of the multi-path light wave, the reflective filter is composed of a large-area total reflection mirror and a large-area 1577 nm thin film filter.

The light from the gain medium in each RSOA of the RSOA array is filtered by a 1577 nm thin film filter to generate a light wave with a wavelength of 1577 nm. The total reflection mirror in the reflective filter is totally reflected back to the gain medium, and a part of the light wave passes through the RSOA. The partial mirror output is formed to form an output of the multi-path light wave, and after being modulated by the modulator MOD array, the multi-channel optical signal is output.

It should be noted that the devices of the above passive waveguide are integrated and packaged on the PLC chip. FIG. 6 is a schematic structural diagram of still another specific implementation of the external modulation laser shown in FIG. 2, as shown in FIG. 6, specifically including: a Bragg grating, an RSOA array, and a modulator MOD array.

It should be noted that the pass band of the Bragg grating can be specifically set according to the wavelength of the optical wave actually required. The PLC chip of this embodiment is silicon dioxide SiO 2 , and the Bragg grating can be directly fabricated in the PLC chip.

In an optional embodiment of the present invention, the RSOA array includes at least two RSOAs, each RSOA is composed of a partial mirror and a gain medium, the RSOA array is located between the Bragg grating and the modulator MOD array, and the Bragg grating is reflective. Bragg grating, consisting of a total reflection mirror and a Bragg grating.

The light from the gain medium in each RSOA of the RSOA array passes through a 1577 nm Bragg grating to generate a light wave with a wavelength of 1577 nm. After passing through the total reflection mirror coupled with the Bragg grating, all of the light is reflected back to the gain medium, and a part of the light wave passes through the RSOA. The partial mirror output in the middle forms the output of the multi-path light wave, and after being modulated by the modulator MOD array, the multi-channel optical signal is output.

In an alternative embodiment of the invention, the RSOA array comprises at least two RSOAs, the RSOA consisting of a total reflection mirror and a gain medium, the Bragg grating being located between the RSOA array and the modulator MOD array. The light from the gain medium in each RSOA of the RSOA array passes through a 1577 nm Bragg grating to generate a light wave output with a wavelength of 1577 nm, thereby forming an output of multiple light waves. Each light wave is modulated by a modulator MOD array, and is divided into multiple paths of light. Signal output.

It should be noted that the above devices are all integrated and packaged on the PLC chip.

The external modulation laser of the present embodiment adopts a temperature-insensitive 1577 nm filter, and the light emitted from the gain medium is filtered to generate a light wave having a wavelength of 1577 nm, and is subjected to splitting, amplifying, and modulating processing to form a stable multi-path optical power. Output.

Since the external modulation laser of the present embodiment does not need to install an additional refrigerator, the power consumption of the external modulation laser is reduced, and the problem that the existing external modulation laser has large power consumption is solved, even if the temperature environment changes greatly. In the case of the externally modulated laser of the present embodiment, stable optical power output can also be achieved, and the stability of the operational performance of the externally modulated laser is improved.

At the same time, the above embodiments all adopt PLC technology to integrate and package the devices in the external modulation laser, which reduces the manufacturing cost, reduces the size of the external modulation laser, and facilitates supporting more ports in the same line card.

Based on the external modulation laser provided by the foregoing embodiment, another embodiment of the present invention provides a passive optical communication device, including but not limited to an optical line terminal or an optical network unit, where the optical line terminal includes the foregoing implementation. For example, an external modulation laser is provided, and the optical network unit includes the external modulation laser provided by the above embodiments.

Based on the external modulation laser provided by the above embodiment, another embodiment of the present invention provides a passive optical network system, where the system includes an optical line terminal located at a central control station and a plurality of optical network units located on the user side, where Passive optical network communication between the optical line terminal and the optical network unit, the optical line terminal includes an external modulation laser for providing a data modulation transmission function, the external modulation laser is an external modulation laser provided by the above embodiment; An externally modulated laser that provides a data modulation transmission function, which is an externally modulated laser provided by the above embodiments.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments are modified, or some of the technical features are equivalently replaced. The modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

claims

1. An externally modulated laser, characterized in that it includes: a laser, which includes a partial mirror, a gain medium and a filter;

The partial reflector, gain medium and filter constitute the laser oscillation cavity of the laser; the filter is used to filter the light emitted by the gain medium to generate light waves of a preset wavelength;

The partial reflecting mirror is used to transmit a part of the generated light waves of a preset wavelength to the modulator for external modulation, and reflect another part of the generated light waves of a preset wavelength back to the gain medium.

2. The externally modulated laser according to claim 1, characterized in that the laser further includes:

A total reflection mirror is provided at the rear end of the gain medium, and is used to reflect the light emitted from the rear end of the gain medium back to the gain medium.

3. The externally modulated laser according to claim 2, wherein the total reflection mirror is coupled to the gain medium to form a reflective gain medium, and the partial reflection mirror is coupled to the filter to form a partial reflection filter. device.

4. The externally modulated laser according to claim 2, wherein the total reflection mirror is coupled to the filter to form a reflection filter, and the partial reflection mirror is coupled to the gain medium to form a partial reflection gain. medium.

5. The externally modulated laser according to claim 1, wherein the filter includes a thin film filter.

6. The externally modulated laser according to any one of claims 1 to 5, further comprising: a beam splitter, located between the laser and the modulator, for converting the laser output into Light waves are divided into at least two light waves.

7. The externally modulated laser according to claim 6, further comprising: a modulator array, the modulator array including at least two modulators, and the number of modulators included in the modulator array is equal to the number of modulators. The number of output light waves of the above-mentioned optical splitters is the same;

The modulator array is used to modulate each light wave output by the optical splitter into a corresponding optical signal.

8. The externally modulated laser according to claim 7, further comprising: an amplifier array, the amplifier array including at least two amplifiers, the amplifier array included in the amplifier array The number of detectors is the same as the number of output light waves of the optical splitter.

9. The externally modulated laser according to claim 8, characterized in that the amplifier array is located between the optical splitter and the modulator array, and the amplifier array is used to convert each of the optical signals output by the optical splitter. The light waves are amplified separately.

10. The externally modulated laser according to claim 8, characterized in that the amplifier array is located behind the modulator array, and the amplifier array is used to separately modulate each optical signal modulated by the modulator array. Perform amplification processing.

11. The externally modulated laser according to claim 8, wherein the amplifier array is coupled to the modulator array.

12. The externally modulated laser according to claim 8, characterized in that the laser, the optical splitter, the amplifier array and the modulator array are connected by optical fibers.

13. The externally modulated laser according to claim 8, wherein the laser, the optical splitter, the amplifier array and the modulator array are connected by planar optical waveguides.

14. A passive optical communication device, characterized in that it includes: the externally modulated laser according to any one of claims 1 to 8.

15. The optical fiber communication equipment according to claim 14, characterized in that the optical fiber communication equipment includes an optical line terminal or an optical network unit.

16. A passive optical network system, characterized in that it includes: an optical line terminal located at a central control station and a plurality of optical network units located at the user side, and the optical line terminal and the optical network unit perform optical fiber communication;

The optical line terminal includes an externally modulated laser used to provide a data modulated transmission function, and the externally modulated laser is the externally modulated laser described in any one of claims 1-13.

17. The passive optical network system according to claim 16, wherein the optical network unit includes an externally modulated laser used to provide a data modulated transmission function, and the externally modulated laser is any of claims 1-13. The externally modulated laser described in one item.