Method for acquiring an optical signal and related device

Abstract

Embodiments of the present application provide a method for obtaining optical signal and related equipment, which can amplify the optical power of the output optical signal and improve the extinction ratio. The method comprises: a laser sends an initial optical signal to a modulator according to an initial electrical signal; the modulator modulates the initial optical signal to generate a first modulated optical signal under the action of a first modulated electrical signal; the modulator sends the first modulated optical signal to an optical amplifier; the optical amplifier modulates the first modulated optical signal and amplifies the optical power under the action of a second modulated electrical signal to obtain a second modulated optical signal, the time delay difference between the first modulated electrical signal and the second modulated electrical signal is less than or equal to a preset threshold, and the modulation rates of the first modulated electrical signal and the second modulated electrical signal are equal.

Description

Technical Field

[0001] This application relates to the field of optical fiber communication technology, and in particular to a method for acquiring optical signals and related equipment. Background Technology

[0002] With the rapid popularization of fiber optic communication network applications, users' demand for fiber optic communication bandwidth is constantly growing. Fiber optic communication networks include optical transmitting equipment and optical receiving equipment. The optical modules included in the optical transmitting equipment can send optical signals to the optical receiving equipment to realize the transmission of optical signals.

[0003] by Figure 1 As shown in the example, the optical transmitting device 100 includes an electro-absorption modulated laser (EML) 101. The EML 101 is used to convert electrical signals into optical signals. To improve the optical power of the optical signal output by the EML 101, a semiconductor optical amplifier (SOA) 102 is integrated at the output end of the EML 101. The SOA 102 is used to amplify the optical power of the optical signal output by the EML 101.

[0004] However, during the process of amplifying the optical power of the optical signal from the EML101, the SOA102 needs to be injected with a large current to meet the optical power requirements of the optical transmitting device 100. Under the influence of a large current, the SOA102 will suffer catastrophic optical damage (COD), which will cause irreversible damage to the EML. Summary of the Invention

[0005] This invention provides a method for acquiring optical signals and related equipment, which can amplify the optical power of the output optical signal and improve the extinction ratio.

[0006] A first aspect of this invention provides a method for acquiring an optical signal, the method comprising: a laser sending an initial optical signal to a modulator based on an initial electrical signal; the modulator modulating the initial optical signal under the action of a first modulation electrical signal to generate a first modulation optical signal; the modulator sending the first modulation optical signal to an optical amplifier; the optical amplifier modulating the first modulation optical signal and amplifying its optical power under the action of a second modulation electrical signal to acquire a second modulation optical signal, wherein the time delay difference between the first modulation electrical signal and the second modulation electrical signal is less than or equal to a preset threshold, and the modulation rates between the first modulation electrical signal and the second modulation electrical signal are equal.

[0007] It is evident that by modulating the initial optical signal from the laser through both the modulator and the optical amplifier, the extinction ratio and optical power of the second modulated optical signal output by the optical amplifier are improved, the bit error rate and jitter of the second modulated optical signal are reduced, and the signal quality of the second modulated optical signal is improved.

[0008] Furthermore, the extinction ratio of the modulator modulating the initial optical signal can be relatively small, and the extinction ratio of the optical amplifier modulating the first modulated optical signal can also be relatively small. The extinction ratio of the second modulated optical signal output by the optical amplifier is the sum of the extinction ratio of the modulator and the extinction ratio of the optical amplifier. This allows the optical amplifier to achieve a relatively large extinction ratio of the second modulated optical signal output even when the extinction ratio of the modulator modulating the initial optical signal and the extinction ratio of the optical amplifier modulating the first modulated optical signal are both relatively small. This enables both the modulator and the optical amplifier to perform modulation with a smaller current, effectively reducing the current magnitude of the first modulated electrical signal received by the modulator and the second modulated electrical signal received by the optical amplifier, and effectively reducing the insertion loss and modulation loss of the modulator and the optical amplifier.

[0009] Because the optical amplifier can achieve a relatively large extinction ratio of the second modulated optical signal when receiving a first modulated electrical signal and a second modulated electrical signal with a relatively small current value, it effectively reduces the current density injected into the optical amplifier, avoids optical catastrophic damage to the optical signal, and improves the reliability of the optical chip.

[0010] Based on the first aspect, in one optional implementation, the preset threshold is half of the signal period of the initial optical signal.

[0011] As can be seen, when the preset threshold is half the signal period of the initial optical signal, the extinction ratio and optical power of the second modulated optical signal output by the optical amplifier can be effectively improved, the bit error rate and jitter of the second modulated optical signal can be reduced, and the signal quality of the second modulated optical signal can be improved.

[0012] Based on the first aspect, in an optional implementation, before the laser sends an initial optical signal to the modulator according to the initial electrical signal, the method further includes: the laser receiving the initial electrical signal, wherein the initial electrical signal is a DC signal; and the laser performing electro-optic conversion under the action of the DC signal to obtain the initial optical signal.

[0013] As can be seen, because the laser receives a DC signal, it performs electro-optical conversion under the influence of the DC signal, without introducing frequency chirp. This makes the laser suitable as a light source for high-speed, long-distance transmission, making it an ideal light source for high-speed optical communication. Furthermore, because modulation is achieved through an external modulator and optical amplifier, the modulation process of the optical signal does not interfere with the laser's operation, ensuring the stability of the wavelength and rate of the initial optical signal output by the laser. Moreover, since the laser does not require modulation of the optical signal, the cavity length of the laser can be shortened, effectively reducing the packaging difficulty and cost of the optical signal.

[0014] Based on the first aspect, in an optional implementation, before the laser sends an initial optical signal to the modulator according to the initial electrical signal, the method further includes: the laser receiving the initial electrical signal, wherein the time delay difference between the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal is less than or equal to the preset threshold, and the modulation rates of the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal are equal; and the laser modulates the initial electrical signal under the action of the initial electrical signal to generate the modulated initial optical signal.

[0015] It is evident that by modulating through the laser, modulator, and optical amplifier, the extinction ratio and optical power of the second modulated optical signal output by the optical amplifier are improved, the bit error rate and jitter of the second modulated optical signal are reduced, and the signal quality of the second modulated optical signal is improved. Furthermore, to achieve the desired extinction ratio of the second modulated optical signal output by the optical amplifier, the extinction ratio modulated by the laser, the modulator, and the optical amplifier can all be relatively small. The extinction ratio of the second modulated optical signal output by the optical amplifier is the sum of the extinction ratios modulated by the laser, the modulator, and the optical amplifier. This effectively reduces the magnitude of the current in the initial electrical signal received by the laser, the first modulated electrical signal received by the modulator, and the second modulated electrical signal received by the optical amplifier, thus effectively reducing the insertion loss and modulation loss of the laser, modulator, and optical amplifier.

[0016] Furthermore, since the extinction ratio of the laser modulation can be relatively small, the extinction ratio of the modulator modulation can be relatively small, and the extinction ratio of the optical amplifier modulation can also be relatively small, the extinction ratio of the second modulated optical signal output by the optical amplifier is the sum of the extinction ratios of the laser modulation, the modulator modulation, and the optical amplifier modulation. Therefore, even when the extinction ratios of the laser, modulator, and optical amplifier are relatively small, the extinction ratio of the second modulated optical signal output by the optical amplifier can still be effectively guaranteed. This effectively reduces the magnitude of the current in the initial electrical signal received by the laser, the first modulated electrical signal received by the modulator, and the second modulated electrical signal received by the optical amplifier, effectively reducing the insertion loss and modulation loss of the laser, modulator, and optical amplifier.

[0017] Based on the first aspect, in one optional implementation, the first modulated electrical signal has a first waveform, the second modulated electrical signal has a second waveform, and the changing trends of the first waveform and the second waveform are the same or approximately the same.

[0018] It can be seen that when the changing trends of the first waveform and the second waveform are the same or approximately the same, the bit error rate and jitter of the second modulated optical signal can be effectively reduced, and the signal quality of the second modulated optical signal can be improved.

[0019] Based on the first aspect, in an optional implementation, the method further includes: the electric drive module sending the initial electrical signal to the laser; the electric drive module sending the first modulated electrical signal to the modulator; and the electric drive module sending the second modulated electrical signal to the optical amplifier.

[0020] Based on the first aspect, in an optional implementation, the electric drive module includes a first electric driver, a second electric driver, and a third electric driver, wherein the first electric driver is connected to a laser, the second electric driver is connected to a modulator, and the third electric driver is connected to an optical amplifier; the method further includes:

[0021] The laser receives an initial electrical signal from a first electrical driver, the modulator receives a first modulated electrical signal from a second electrical driver, and the optical amplifier receives a second modulated electrical signal from a third electrical driver.

[0022] Based on the first aspect, in an optional implementation, the electric drive module includes a fourth electric driver and a fifth electric driver, the fourth electric driver being connected to the laser, and the fifth electric driver being connected to the modulator and the optical amplifier. The method further includes:

[0023] The laser receives an initial electrical signal from a fourth electrical driver, the modulator receives a first modulated electrical signal from a fifth electrical driver, and the optical amplifier receives a second modulated electrical signal from the fifth electrical driver.

[0024] Based on the first aspect, in an optional implementation, an electrical splitter is connected between the fifth electrical driver and the modulator, and the electrical splitter is connected between the fifth electrical driver and the optical amplifier; the method further includes:

[0025] The electrical splitter receives a modulated electrical signal from the fifth electrical drive module, and the electrical splitter divides the modulated electrical signal to form a first modulated electrical signal and a second modulated electrical signal; the electrical splitter sends the first modulated electrical signal to the modulator; the electrical splitter sends the second modulated electrical signal to the optical amplifier.

[0026] Based on the first aspect, in one optional implementation, the first modulated electrical signal and the second modulated electrical signal are signals from the same source.

[0027] Based on the first aspect, in an optional implementation, the electric drive module includes a sixth electric driver, the sixth electric driver being connected to the laser, the modulator, and the optical amplifier, and the method further includes:

[0028] The laser receives an initial electrical signal from the sixth electrical driver, the modulator receives a first modulated electrical signal from the sixth electrical driver, and the optical amplifier receives a second modulated electrical signal from the sixth electrical driver.

[0029] Based on the first aspect, in an optional implementation, an electrical splitter is connected between the sixth electrical driver, the modulator, the laser, and the optical amplifier; the method further includes:

[0030] The electrical splitter receives a modulated electrical signal from the sixth electrical drive module, and divides the modulated electrical signal to form an initial electrical signal, a first modulated electrical signal, and a second modulated electrical signal; the electrical splitter sends the initial electrical signal to the laser, sends the first modulated electrical signal to the modulator, and sends the second modulated electrical signal to the optical amplifier.

[0031] Based on the first aspect, in one optional implementation, the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal are signals from the same source.

[0032] A second aspect of this invention provides an optical chip comprising a laser, a modulator, and an optical amplifier connected in sequence. The laser is used to send an initial optical signal to the modulator based on an initial electrical signal. The modulator is used to modulate the initial optical signal to generate a first modulated optical signal under the action of a first modulated electrical signal. The modulator is used to send the first modulated optical signal to the optical amplifier. The optical amplifier is used to modulate the first modulated optical signal and amplify its optical power under the action of a second modulated electrical signal to obtain a second modulated optical signal. The time delay difference between the first modulated electrical signal and the second modulated electrical signal is less than or equal to a preset threshold, and the modulation rates of the first modulated electrical signal and the second modulated electrical signal are equal.

[0033] For a detailed explanation of the beneficial effects of the optical chip shown in this section, please refer to the first section; further details will not be elaborated here.

[0034] Based on the second aspect, in an optional implementation, the laser is further configured to: receive the initial electrical signal, wherein the initial electrical signal is a DC electrical signal; and perform electro-optical conversion under the action of the DC electrical signal to obtain the initial optical signal.

[0035] Based on the second aspect, in an optional implementation, the laser is further configured to: receive the initial electrical signal, wherein the time delay difference between the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal is less than or equal to the preset threshold, and the modulation rates of the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal are equal; and modulate the initial electrical signal to generate the modulated initial optical signal under the action of the initial electrical signal.

[0036] Based on the second aspect, in one optional implementation, the laser, the modulator, and the optical amplifier are monolithically integrated structures.

[0037] Based on the second aspect, in one optional implementation, the laser is a directly modulated laser (DFB), a distributed Bragg reflector (DBR) laser, a Fabry-Perot laser (FP) laser, a distributed feedback laser, or an external cavity laser; and the modulator is an electroabsorption modulator, a microring modulator, or a Mach-Zehnder optical modulator.

[0038] A third aspect of this invention provides an optical module comprising a laser, a modulator, and an optical amplifier connected in sequence, and an electrically driven module connected to the laser, the modulator, and the optical amplifier respectively. The electrically driven module is configured to send an initial electrical signal to the laser, a first modulated electrical signal to the modulator, and a second modulated electrical signal to the optical amplifier. The laser sends an initial optical signal to the modulator based on the initial electrical signal. The modulator modulates the initial optical signal under the action of the first modulated electrical signal to generate a first modulated optical signal. The modulator sends the first modulated optical signal to the optical amplifier. The optical amplifier modulates the first modulated optical signal and amplifies its optical power under the action of the second modulated electrical signal to obtain a second modulated optical signal. The time delay difference between the first and second modulated electrical signals is less than or equal to a preset threshold, and the modulation rates of the first and second modulated electrical signals are equal.

[0039] For a detailed explanation of the beneficial effects of the optical module shown in this section, please refer to the first section; further details will not be elaborated here.

[0040] Based on the third aspect, in an optional implementation, the electric drive module includes at least one electric driver, the at least one electric driver being used to transmit the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal.

[0041] Based on the third aspect, in an optional implementation, the optical module further includes an electrical splitter connected to the electrical drive module, and the electrical splitter is also connected to the modulator and the optical amplifier respectively. The electrical splitter is used to: receive a modulated electrical signal from the electrical drive module; divide the modulated electrical signal to form a first modulated electrical signal and a second modulated electrical signal; send the first modulated electrical signal to the modulator; and send the second modulated electrical signal to the optical amplifier.

[0042] Based on the third aspect, in an optional implementation, the optical module further includes an electrical splitter connected to the electrical drive module, and the electrical splitter is also connected to the laser, the modulator, and the optical amplifier, respectively. The electrical splitter is used to: receive a modulated electrical signal from the electrical drive module; divide the modulated electrical signal to form an initial electrical signal, a first modulated electrical signal, and a second modulated electrical signal; send the initial electrical signal to the laser; send the first modulated electrical signal to the modulator; and send the second modulated electrical signal to the optical amplifier.

[0043] A fourth aspect of the present invention provides an optical emitting component, the optical emitting component comprising the optical chip as described in the second aspect above.

[0044] A fifth aspect of the present invention provides an optical network device, the optical network device including an optical module as shown in the third aspect. Attached Figure Description

[0045] Figure 1 A structural example diagram of an optical transmission device provided by an existing solution;

[0046] Figure 2 This is a structural example diagram of an embodiment of the optical fiber communication network provided in this application;

[0047] Figure 3 This is a structural example diagram of an embodiment of the optical network device provided in this application;

[0048] Figure 4 This is a structural example diagram of the first embodiment of the optical module provided in this application;

[0049] Figure 5 A cross-sectional view of one embodiment of the optical chip provided in this application along a first direction;

[0050] Figure 6 This is an example diagram illustrating the overall structure of an embodiment of the optical chip provided in this application;

[0051] Figure 7 A flowchart illustrating the steps of a first embodiment of the optical signal acquisition method provided in this application;

[0052] Figure 8a This is a structural example diagram of a second embodiment of the optical module provided in this application;

[0053] Figure 8b This is a structural example diagram of a third embodiment of the optical module provided in this application;

[0054] Figure 9 This is an example diagram of a first embodiment of the eye diagram provided in this application;

[0055] Figure 10 Example diagram of a second embodiment of the eye diagram provided in this application;

[0056] Figure 11 A flowchart illustrating the steps of a second embodiment of the optical signal acquisition method provided in this application;

[0057] Figure 12 This is a structural example diagram of the fourth embodiment of the optical module provided in this application;

[0058] Figure 13This is an example diagram of a third embodiment of the eye diagram provided in this application. Detailed Implementation

[0059] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0060] To better understand the optical signal acquisition method, optical chip, optical module, and optical transmission device provided in this application, the following is combined with... Figure 2 The diagram illustrates the optical fiber communication network used in this application. Among other things, Figure 2 This is a structural example diagram of one embodiment of the optical fiber communication network provided in this application. Figure 2 As shown, this application uses a passive optical network (PON) system as an example for illustrative purposes:

[0061] PON includes an optical line terminal (OLT) 210, which provides a network-side interface for the optical access network (OAN). The OLT 210 connects to upper-layer network-side devices (such as switches and routers) and to one or more optical distribution networks (ODNs) at the lower layer.

[0062] The ODN consists of three parts: a splitter 221, a trunk optical cable 222 connecting the OLT 210 and the splitter 221, and a branch optical cable 223 connecting the splitter 221 and the ONU 230. The trunk optical cable 222 is used for optical signal transmission between the OLT 210 and the splitter 221, while the branch optical cable 223 is used for optical signal transmission between the splitter 221 and the ONU 230.

[0063] When the OLT210 needs to transmit downlink optical signals to the ONU230, the ODN transmits the downlink optical signals from the OLT210 to each ONU through the optical splitter 221. Similarly, when the ONU230 needs to transmit uplink optical signals to the OLT210, the ODN aggregates the uplink optical signals from the ONU230 through the optical splitter 221 and transmits them to the OLT210.

[0064] The ONU230 provides a user-side interface for the OAN and connects to the ODN. If the ONU230 also provides user port functionality, such as an Ethernet user port or a plain old telephone service (POTS) user port, it is called an optical network termination (ONT). In this application, both ONU and ONT are referred to as Optical Network Unit (ONU).

[0065] The following is an optional description of the application scenarios of this application: During the upgrade of PON to higher bandwidth, for example, from a gigabit-capable passive optical network (GPON) to an XG passive optical network (10-gigabit-capable passive optical network, 10GPON). In order to achieve a smooth network upgrade and reduce the construction cost of PON during the upgrade from GPON to 10GPON, a combined passive optical network (Combo PON) compatible with both GPON and 10GPON emerges.

[0066] Combo PON reuses existing PON network architecture, avoiding modifications to the existing PON network and additional data center space requirements, enabling rapid large-scale deployment and easy customer operation and maintenance. A key requirement in Combo PON is the high speed and high power performance of the transmitted optical signal. To achieve this, existing PONs offer two solutions: direct modulated lasers (DMLs) and externally modulated semiconductor lasers.

[0067] DML (Discrete Modulation Current) refers to modulating the output optical power of a DML by changing the modulation current injected into it. DMLs are simple in structure, easy to implement, and inexpensive. Furthermore, their high power output and low power consumption reduce packaging requirements. However, the modulation current injected into the DML causes a change in the refractive index of the source layer, modulating the phase of the light and broadening the operating frequency, resulting in significant frequency chirp. This chirp worsens with increasing modulation rate, leading to high pulse dispersion loss and limiting transmission distance. Additionally, the maximum modulation rate of a DML is limited by the relaxation oscillation between carriers and photons. Therefore, DMLs are suitable for fiber optic communication networks with low extinction ratios, low dispersion, and short transmission distances. Consequently, DMLs are not suitable for applications requiring high extinction ratios, high dispersion, and long transmission distances.

[0068] An externally modulated semiconductor laser refers to a laser whose output optical signal is directly coupled to an external modulator, with the modulation signal applied to the external modulator. The acousto-optic and electro-optic effects of the external modulator cause parameters such as the intensity of the modulated optical signal output by the external modulator to vary with the modulation signal. Because the laser operates in DC mode, the frequency chirp of the output optical signal is small. Therefore, externally modulated semiconductor lasers are suitable for high-speed, long-distance transmission and are ideal light sources for high-speed optical communication systems. Existing externally modulated semiconductor lasers, to meet the high optical power requirements of optical transmission equipment, can be found in [reference needed]. Figure 1 As shown, a large current needs to be injected into the SOA, which will generate COD.

[0069] Based on the above-mentioned deficiencies, the optical signal acquisition method, optical chip, optical module, and optical transmission device provided in this application can effectively improve the optical power of the output optical signal, effectively avoid COD, and effectively avoid large DML chirp, thereby effectively meeting the requirements of high bandwidth (such as 10GPON) for fiber dispersion cost and extinction ratio. The following describes this application in conjunction with different embodiments.

[0070] Example 1

[0071] The following combination Figure 3 The structure of the optical network device provided in this application is illustrated below. The optical network device shown in this embodiment can be... Figure 2 The OLT or ONU shown in this embodiment is illustrated using an OLT as an example. Figure 3 This is a structural example diagram of one embodiment of the optical network device provided in this application.

[0072] The optical network device shown in this embodiment includes an optical module 300, which includes a bi-direction optical subassembly (BOSA) 301. BOSA 301 includes a transmitter optical subassembly (TOSA) 302 and a receiver optical subassembly (ROSA) 303. TOSA 302 can also be referred to as an optical transmitter submodule, optical transmitter, etc., and ROSA 303 can also be referred to as an optical receiver submodule or optical receiver, etc., but is not specifically limited in this embodiment.

[0073] The optical module 300 shown in this embodiment also includes an electrically driven module 304 connected to ROSA 303 and TOSA 302 respectively. This embodiment does not limit the specific form of the electrically driven module 304. For example, the electrically driven module 304 can be one or more chips, or one or more integrated circuits. For example, the electrically driven module 304 can be one or more field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), system-on-chips (SoCs), central processor units (CPUs), network processors (NPs), microcontroller units (MCUs), programmable logic devices (PLDs), or other integrated chips, or any combination of the above chips, etc., without specific limitations.

[0074] The following combination Figure 4 The structure of the TOSA302 provided in this embodiment will be described as shown below, wherein, Figure 4 Example diagram of the structure of the first embodiment of the optical module provided in this application:

[0075] The TOSA302 shown in this embodiment includes an optical chip 400, which can be an enhanced electro-absorption modulated laser (A-EML). The optical chip 400 integrates a laser 401, a modulator 402, and an optical amplifier 403, wherein the laser 401, modulator 402, and optical amplifier 403 are connected sequentially, and the electric drive module 304 is connected to the laser 401, modulator 402, and optical amplifier 403 respectively.

[0076] The following combination Figure 5 and Figure 6 The physical structure of the optical chip shown in this embodiment is illustrated by way of example. Figure 5 A cross-sectional view of one embodiment of the optical chip provided in this application along a first direction; Figure 6 This is an example diagram illustrating the overall structure of an embodiment of the optical chip provided in this application. The optical chip 400 shown in this embodiment has a monolithic integrated structure, meaning that the laser 401, modulator 402, and optical amplifier 403 included in the optical chip 400 are based on the same substrate. A detailed description of the structure is as follows:

[0077] The optical chip 400 shown in this embodiment includes a laser 401, a modulator 402, and an optical amplifier 403. A first isolation region 541 is formed between the laser 401 and the modulator 402, and a second isolation region 542 is formed between the modulator 402 and the optical amplifier 403.

[0078] The first direction 501 shown in this embodiment is the cavity length direction of the optical chip. The specific lengths of the laser 401, modulator 402 and optical amplifier 403 are not limited. For example, the length of the laser 401 is 400 micrometers, the length of the modulator 402 is 200 micrometers, and the length of the optical amplifier 403 is 300 micrometers.

[0079] Specifically, the laser 401 includes an N+ electrode layer 511, which is gold, germanium, nickel, or an alloy formed of at least two of gold, germanium, and nickel, with a thickness of 200 to 500 nanometers.

[0080] A substrate 512 is formed on the surface of the N+ electrode layer 511. The substrate 512 may be made of a semiconductor material, such as indium phosphide (InP).

[0081] A lower confinement layer 513 is formed on the surface of the substrate 512. The lower confinement layer 513 is used to confine carriers and photons along a second direction 502, wherein the second direction 502 is a direction perpendicular to the first direction 501. The lower confinement layer 513 shown in this embodiment can be made of quaternary materials such as indium (In), gallium (Ga), aluminum (Al), and arsenic (As), and the thickness can be 150 nanometers.

[0082] A quantum well layer 514 is formed on the surface of the lower confinement layer 513. The quantum well layer 514 is used to convert electrical energy into photons. It is made of undoped quaternary materials such as In, Ga, Al, and As, and has a thickness of 100 nanometers to 200 nanometers. The quantum well layer 514 can be a multi-quantum well active region layer.

[0083] An upper confinement layer 515 is formed on the surface of the quantum well layer 514. The upper confinement layer 515 is used to confine carriers and photons along the second direction 502. It is made of quaternary materials such as In, Ga, Al, and As, and has a thickness of 150 nanometers.

[0084] A grating layer 517 is formed on the surface of the upper confinement layer 515. This grating layer 517 has an alternating structure of InP, In, Ga, Al, and As, where InP is a material composed of indium (In), a group III element, and phosphorus (P), a group V element. Along the first direction 501, the length of the grating layer 517 can be 220 micrometers. To achieve single-mode operation of the optical chip, the grating layer 517 employs a partially gain-coupled grating or a λ / 4 phase-shift grating. The grating layer 517 can have an alternating structure of InP and InGaAsP, and its length can be 150 micrometers. The grating layer 517 can also be a uniform grating structure.

[0085] A waveguide layer 518 is formed on the surface of the grating layer 517. The waveguide layer 518 is used to form a waveguide for optical transmission. It is made of InP material with a thickness of 1.5 micrometers to 2 micrometers and a doping concentration greater than or equal to 1E18cm. -3 .

[0086] A contact electrode layer 519 is formed on the surface of the waveguide layer 518. To facilitate ohmic contact with the metal, the contact electrode layer 519 is typically heavily doped indium gallium arsenide with a doping concentration greater than or equal to 1E19cm⁻¹. -3 The thickness ranges from 50 to 300 nanometers.

[0087] A P+ electrode layer 520 is formed on the surface of the contact electrode layer 519. The P+ electrode layer 520 is made of titanium-platinum alloy or the like, and the thickness of the P+ electrode layer 520 can be between 500 nanometers and 2 micrometers.

[0088] The first isolation region 541 shown above is typically located between the laser 401 and the modulator 402. It is etched through the P+ electrode layer 520 and the contact electrode layer 519, and the waveguide layer 518 is etched to a certain depth to achieve electrical isolation between the laser 401 and the modulator 402.

[0089] The second isolation region 542 is typically located between the modulator 402 and the optical amplifier 403. It is etched through the P+ electrode layer 520 and the contact electrode layer 519, and the waveguide layer 518 is etched to a certain depth to achieve electrical isolation between the modulator 402 and the optical amplifier 403.

[0090] The isolation resistance of the first isolation region 541 and the second isolation region 542 is greater than 1000 ohms. Optionally, protons or inert ions can be injected into the first isolation region 541 and the second isolation region 542 respectively to increase the isolation resistance value of the first isolation region 541 and the second isolation region 542.

[0091] The modulator 402 shown in this embodiment includes an N+ electrode layer, a substrate, a lower confinement layer, a quantum well layer, an upper confinement layer, a waveguide layer, a contact electrode layer, and a P+ electrode layer. For detailed descriptions, please refer to the above description; further elaboration is omitted here. The optical amplifier 403 shown in this embodiment includes an N+ electrode layer, a substrate, a lower confinement layer, a quantum well layer, an upper confinement layer, a waveguide layer, a contact electrode layer, and a P+ electrode layer. For detailed descriptions, please refer to the above description; further elaboration is omitted here.

[0092] The following describes the types of devices in the optical chip shown in this embodiment:

[0093] The laser 401 shown in this embodiment can be a distributed feedback laser (DFB), a distributed Bragg reflector (DBR) laser, or a Fabry-Perot (FP) laser, etc. The modulator 402 shown in this embodiment can be an electro-absorption modulator. The optical amplifier 403 shown in this embodiment can be a semiconductor optical amplifier (SOA).

[0094] Optionally, the above example uses a monolithic integrated structure of laser, modulator, and optical amplifier. In other examples, laser, modulator, and optical amplifier can also be discrete structures. In this case, laser can be an external cavity laser, and modulator can be a micro-ring modulator or a Mach-Zehnder optical modulator, etc.

[0095] Based on the above description of the optical module's structure, the following, combined with... Figure 7 The process of acquiring optical signals by the optical module shown in this embodiment will be described: wherein, Figure 7 This is a flowchart illustrating the steps of a first embodiment of the optical signal acquisition method provided in this application.

[0096] Step 701: The electric drive module sends an initial electrical signal to the laser.

[0097] Step 702: The electric drive module sends the first modulated electrical signal to the modulator.

[0098] Step 703: The electric drive module sends a second modulated electrical signal to the optical amplifier.

[0099] This embodiment does not limit the execution sequence between steps 701 and 703.

[0100] The following provides examples of several optional structures for electric drive modules:

[0101] Structure 1

[0102] like Figure 8a As shown, where, Figure 8a This is a structural example diagram of a second embodiment of the optical module provided in this application. The electrically driven module shown in this embodiment specifically includes a first electrically driven driver 811, a second electrically driven driver 812, and a third electrically driven driver 813. For a description of the configuration of each electrically driven driver, please refer to... Figure 3 The description of the electric drive module's form shown is not repeated in this embodiment.

[0103] In this embodiment, the first electrical driver 811 is connected to the laser 401 and is used to send an initial electrical signal to the laser 401. The second electrical driver 812 is connected to the modulator 402 and is used to send a first modulation electrical signal to the modulator 402. The third electrical driver 813 is connected to the optical amplifier 403 and is used to send a second modulation electrical signal to the optical amplifier 403.

[0104] It should be clarified that the terms "first", "second", and "third" shown in this embodiment are used to describe different devices and are only used to distinguish one device from another. For example, the first electric driver and the second electric driver are only used to represent two different electric drivers.

[0105] Structure 2

[0106] The electric drive module shown in structure 2 can also transmit an initial electrical signal, a first modulated electrical signal, and a second modulated electrical signal through two electric drivers. This embodiment uses an electric drive module including, for example... Figure 8b As shown, where, Figure 8b This is a structural example diagram of a third embodiment of the optical module provided in this application. Figure 8b The following example illustrates the use of an electric drive module including a fourth electric driver 821 and a fifth electric driver 822. For a description of the configuration of each electric driver, please refer to [link to relevant documentation]. Figure 3 The description of the electric drive module's form shown is not repeated in this embodiment.

[0107] The fourth electrical driver 821 shown in this embodiment is connected to the laser 401, and is used to send an initial electrical signal to the laser 401. The fifth electrical driver 822 is connected to an electrical splitter 823, which is connected to both the modulator 402 and the optical amplifier 403. The fifth electrical driver 822 sends a modulated electrical signal to the electrical splitter 823, which then divides the modulated electrical signal to form a first modulated electrical signal and a second modulated electrical signal. In this embodiment, the first and second modulated electrical signals have the same modulation data, and the power of the first and second modulated electrical signals are both a portion of the total power of the modulated electrical signal. The electrical splitter 823 is also used to send the first modulated electrical signal to the modulator 402 and the second modulated electrical signal to the optical amplifier 403.

[0108] It can be seen that the first modulated electrical signal and the second modulated electrical signal in this example are electrical signals from the same source.

[0109] Step 704: Under the influence of the initial electrical signal, the laser performs electro-optical conversion to obtain the initial optical signal.

[0110] In this embodiment, the initial electrical signal sent by the electric drive module to the laser is a DC signal, and the laser can then perform electro-optical conversion under the action of the DC signal to obtain the initial optical signal.

[0111] The laser performs electro-optical conversion under the action of DC electrical signal, without introducing frequency chirp. The laser shown in this embodiment is suitable as a light source for high-speed, long-distance transmission and is an ideal light source for high-speed optical communication.

[0112] Step 705: The modulator modulates the initial optical signal according to the first modulation electrical signal to generate the first modulation optical signal.

[0113] Step 706: The modulator sends the first modulated optical signal to the optical amplifier.

[0114] Step 707: Under the action of the second modulation electrical signal, the optical amplifier modulates the first modulation optical signal and amplifies the optical power to obtain the second modulation optical signal.

[0115] As can be seen, when the optical amplifier shown in this embodiment receives the second modulation electrical signal, it can modulate the first modulation optical signal and amplify the optical power of the first modulation optical signal under the action of the second modulation electrical signal, thereby ensuring that the optical power of the second modulation optical signal output by the optical amplifier is greater than the optical power of the first modulation optical signal, and also ensuring that the extinction ratio (ER) of the second modulation optical signal output by the optical amplifier is greater than the extinction ratio of the first modulation optical signal.

[0116] The electric drive module shown in this embodiment modulates the initial optical signal from the laser by sending a first modulation electrical signal to the modulator and a second modulation electrical signal to the optical amplifier.

[0117] Specifically, the initial optical signal sent by the laser to the modulator is an optical wave with an initial waveform, the first modulated electrical signal received by the modulator is an electrical bit stream with a first waveform, and the second modulated electrical signal received by the optical amplifier is an electrical bit stream with a second waveform.

[0118] When the modulator receives the initial optical signal and the first modulation electrical signal, the modulator, under the action of the first modulation electrical signal, loads the first modulation electrical signal onto the initial waveform of the initial optical signal to output the first modulation optical signal.

[0119] When the optical amplifier receives a second modulated electrical signal and a first modulated optical signal from the modulator, the optical amplifier, under the action of the second modulated electrical signal, loads the second modulated electrical signal onto the waveform of the first modulated optical signal to output the second modulated optical signal.

[0120] The modulator and optical amplifier shown in this embodiment can change the parameters of the optical signal by modulating the initial optical signal from the laser. The parameters include one or more of the following: amplitude, phase, frequency, polarization, or wavelength. The specific parameters are not limited in this embodiment.

[0121] Modulating the initial optical signal from the laser using a modulator and optical amplifier, specifically by amplitude modulation of the initial optical signal from the laser, can effectively improve the extinction ratio of the optical chip. The extinction ratio refers to the ratio of the high-level optical power to the low-level optical power of the second modulated optical signal output by the optical chip.

[0122] The higher the extinction ratio of the second modulated optical signal shown in this embodiment, the greater the distinction between the optical power of bit "1" and the optical power of bit "0" included in the second modulated optical signal. When the optical receiving device receives the second modulated optical signal, the optical receiving device can more easily distinguish between bit "1" and bit "0", and thus the bit error rate (BER) will be lower.

[0123] To better understand this, the following is a general explanation of the eye diagram of optical signals:

[0124] like Figure 9 As shown, Figure 9 This is an example diagram of a first embodiment of the eye diagram provided in this application. An eye diagram detector scans the optical signal to obtain the corresponding eye diagram 900. Specifically, the eye diagram 900 is actually a display of a series of different binary bits of the optical signal accumulated on the screen of the eye diagram detector according to a certain pattern. Simply put, because the eye diagram detector has a persistence function, as long as all the captured waveforms are superimposed and accumulated in three-bit increments, the eye diagram 900 is formed. It can be seen that the eye diagram 900 reflects the overall characteristics of the optical signal. The eye diagram detector can be an eye diagram analyzer with an optical port, also known as a digital communications analyzer (DCA).

[0125] like Figure 9 As shown in the eye diagram 900, the greater the extinction ratio of the optical signal, the higher the eye height 901 opening of the eye diagram 900. Here, eye height 901 is the difference between optical power 902 and optical power 903. Optical power 902 is the average optical power of the "1" bits included in the optical signal, and optical power 903 is the average optical power of the "0" bits included in the optical signal. It can be seen that the higher the eye height opening of the eye diagram 900 corresponding to the optical signal, the greater the extinction ratio of the optical signal, and thus the better the signal quality of the optical signal.

[0126] The following combination Figure 10 The advantages of both the modulator and the optical amplifier shown in this embodiment being modulated are explained below. Figure 10 This is an example diagram of a second embodiment of the eye diagram provided in this application.

[0127] Figure 10 For explanations of the eye diagrams shown, please refer to [link / reference needed]. Figure 9 As shown, the specifics will not be elaborated further. Figure 10 The eye diagram 1011 shown is the eye diagram corresponding to the optical signal output by modulation only through the modulator. The eye diagram 1011 has an eye height 1012. Figure 10The eye diagram 1021 shown is the eye diagram corresponding to the optical signal output by modulation only through the optical amplifier. The eye diagram 1021 has an eye height of 1022.

[0128] As shown in this embodiment, modulation can be achieved through both a modulator and an optical amplifier. Figure 10 The eye diagram 1031 shown is the eye diagram corresponding to the second modulated optical signal output by the optical amplifier shown in this embodiment. The eye diagram 1031 has an eye height of 1032.

[0129] Comparing eye diagrams 1011, 1021, and 1031, it can be seen that the second modulated optical signal shown in this embodiment is modulated by a modulator and further modulated by an optical amplifier. This indicates that the second modulated optical signal in this embodiment has undergone both modulation by the modulator and the optical amplifier, resulting in a high eye opening at eye height 1032 in eye diagram 1031. The high eye opening at eye height 1032 in eye diagram 1031 indicates that the second modulated optical signal in this embodiment has high optical power and extinction ratio.

[0130] In this embodiment, the first and second modulated electrical signals need to meet a first preset condition in order to achieve the goal of the second modulated optical signal having a relatively large optical power and extinction ratio. Therefore, the first preset condition shown in this embodiment will be explained as follows:

[0131] The first preset condition shown in this embodiment is that the time delay difference between the first modulated electrical signal and the second modulated electrical signal is less than or equal to a preset threshold, and the modulation rates between the first modulated electrical signal and the second modulated electrical signal are equal.

[0132] Specifically, in this embodiment, the time delay difference between the first modulated electrical signal and the second modulated electrical signal being less than or equal to a preset threshold means that, within the same period, the signal amplitudes of the first modulated electrical signal and the second modulated electrical signal exhibit the same or approximately the same trend over time. It can be seen that when the time delay difference between the first modulated electrical signal and the second modulated electrical signal is less than or equal to the preset threshold, the trend of change of the first waveform of the first modulated electrical signal and the trend of change of change of the second waveform of the second modulated electrical signal are the same or approximately the same.

[0133] The preset threshold shown in this embodiment can be half the signal period of the initial optical signal. Here, the signal period in this embodiment refers to the time interval between two identical signals in the initial optical signal. For example, if the initial optical signal is a non-return-to-zero (NRZ) signal, then the signal period T is equal to the ratio of 1 to the bit rate.

[0134] The equal modulation rates between the first modulation signal and the second modulation signal in this embodiment mean that the signal period of the first modulation signal and the signal period of the second modulation signal are the same.

[0135] See also Figure 10 As shown in the eye diagram 1031, in this embodiment, under the condition that the first modulation electrical signal and the second modulation electrical signal meet the first preset condition, it is possible to ensure that the region 1033 shown in the eye diagram 1031 is relatively small, thereby indicating that the jitter of the second modulation optical signal output by the optical amplifier is relatively small and the bit error rate is relatively small, so as to ensure that the signal quality is relatively good.

[0136] The beneficial effects of the optical signal acquisition method shown in this embodiment will be explained below:

[0137] As shown in this embodiment, the initial optical signal from the laser can be modulated by both the modulator and the optical amplifier, thereby improving the extinction ratio and optical power of the second modulated optical signal output by the optical amplifier, reducing the bit error rate and jitter of the second modulated optical signal, and improving the signal quality of the second modulated optical signal.

[0138] In this embodiment, the electric drive module sends a DC signal to the laser. The laser performs electro-optical conversion under the action of the DC signal, without introducing frequency chirp, so that the laser can be used as a light source, which is suitable for high-speed and long-distance transmission and is an ideal light source for high-speed optical communication.

[0139] Furthermore, the extinction ratio of the modulator modulating the initial optical signal shown in this embodiment can be relatively small, and the extinction ratio of the optical amplifier modulating the first modulated optical signal can also be relatively small. The extinction ratio of the second modulated optical signal output by the optical amplifier is the sum of the extinction ratio of the modulator and the extinction ratio of the optical amplifier. This allows the second modulated optical signal output by the optical amplifier to have a relatively large extinction ratio even when the extinction ratio of the modulator modulating the initial optical signal is relatively small and the extinction ratio of the optical amplifier modulating the first modulated optical signal is also relatively small. This enables both the modulator and the optical amplifier to perform modulation with a smaller current, effectively reducing the current magnitude of the first modulated electrical signal received by the modulator and the second modulated electrical signal received by the optical amplifier, and effectively reducing the insertion loss and modulation loss of the modulator and the optical amplifier.

[0140] Because the optical amplifier shown in this embodiment can achieve a relatively large extinction ratio of the second modulated optical signal when receiving a first modulated electrical signal and a second modulated electrical signal with a relatively small current value, it effectively reduces the current density injected into the optical amplifier, avoids optical catastrophic damage to the optical signal, and improves the reliability of the optical chip.

[0141] Because modulation is performed using an external modulator and optical amplifier, the modulation process of the optical signal can be guaranteed not to interfere with the operation of the laser, ensuring the stability of the wavelength and rate of the initial optical signal output by the laser. Moreover, since the laser does not need to modulate the optical signal, the cavity length of the laser can be shortened compared to EML, effectively reducing the packaging difficulty and cost of the optical signal.

[0142] Example 2

[0143] The difference between this embodiment and Embodiment 1 is that the laser shown in this embodiment has a different function than the laser shown in Embodiment 1. For a description of the execution process of the optical signal acquisition method shown in this embodiment, please refer to... Figure 11 As shown, where, Figure 11 This is a flowchart illustrating the steps of a second embodiment of the optical signal acquisition method provided in this application.

[0144] Step 1101: The electric drive module sends an initial electrical signal to the laser that meets the second preset condition.

[0145] Step 1102: The electric drive module sends the first modulated electrical signal to the modulator.

[0146] Step 1103: The electric drive module sends a second modulated electrical signal to the optical amplifier.

[0147] This embodiment does not limit the execution sequence between steps 1101 and 1103.

[0148] The second preset condition shown in this embodiment will be explained below:

[0149] The second preset condition described in this embodiment is: the time delay difference between the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal is less than or equal to a preset threshold, and the modulation rates of the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal are equal.

[0150] For the explanation of the time delay difference between the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal shown in this embodiment being less than or equal to a preset threshold, please refer to the explanation of the time delay difference between the first modulated electrical signal and the second modulated electrical signal being less than or equal to a preset threshold shown in Embodiment 1. The specific details will not be repeated in this embodiment.

[0151] For a detailed explanation of the equal modulation rates of the initial electrical signal, the first modulation electrical signal, and the second modulation electrical signal shown in this embodiment, please refer to the explanation of the equal modulation rates of the first modulation electrical signal and the second modulation electrical signal shown in Embodiment 1. The specific details will not be repeated in this embodiment.

[0152] The following provides an example of an optional structure for the electric drive module:

[0153] The structure of the electric drive module shown in this embodiment can be referred to as structure 1 or structure 2 shown in embodiment 1. The structure of the electric drive module described in this embodiment can also be referred to as... Figure 12 As shown, where, Figure 12 This is a structural example diagram of the fourth embodiment of the optical module provided in this application.

[0154] like Figure 12 As shown in the figure, the electric drive module in this embodiment includes a sixth electric driver 1202, which is connected to an electric splitter 1201. The electric splitter 1201 is connected to a laser 401, a modulator 402, and an optical amplifier 403, respectively. The sixth electric driver 1202 is used to send a modulated electrical signal to the electric splitter 1201, and the electric splitter 1201 is used to divide the modulated electrical signal to form an initial electrical signal, a first modulated electrical signal, and a second modulated electrical signal. For a detailed description of the division process of the electric splitter 1201, please refer to the relevant description of the electric splitter shown in Embodiment 1, which will not be repeated here.

[0155] The electrical splitter 1201 is also used to send an initial electrical signal to the laser 401, to send a first modulated electrical signal to the modulator 402, and to send a second modulated electrical signal to the optical amplifier 403.

[0156] It can be seen that the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal in this example are electrical signals from the same source.

[0157] Step 1104: The laser is modulated under the action of the initial electrical signal to generate the modulated initial optical signal.

[0158] Since the initial electrical signal shown in this embodiment satisfies the second preset condition described above, the laser can modulate the signal under the action of the initial electrical signal to generate a modulated initial optical signal when it receives the initial electrical signal.

[0159] As can be seen from the comparison between Embodiment 1 and Embodiment 2, in Embodiment 1, the laser only has the function of electro-optic conversion, while the laser shown in this embodiment can generate a modulated initial optical signal when it receives an initial electrical signal that meets the second preset condition.

[0160] Step 1105: The modulator modulates the initial optical signal according to the first modulation electrical signal to generate the first modulation optical signal.

[0161] As shown in step 1104, the initial optical signal received by the modulator from the laser is an optical signal that has been modulated by the laser.

[0162] Step 1106: The modulator sends the first modulated optical signal to the optical amplifier.

[0163] Step 1107: Under the action of the second modulation electrical signal, the optical amplifier modulates the first modulation optical signal and amplifies the optical power to obtain the second modulation optical signal.

[0164] For a description of steps 1105 and 1107 shown in this embodiment, please refer to [link to documentation]. Figure 7 The specific execution process shown in steps 705 to 707 is not described in detail in this embodiment.

[0165] The following combination Figure 13 The advantages of the laser, modulator, and optical amplifier shown in this embodiment, which can all achieve modulation, will be explained. Figure 13 This is an example diagram of a third embodiment of the eye diagram provided in this application.

[0166] Figure 13 For explanations of the eye diagrams shown, please refer to [link / reference needed]. Figure 9 As shown, the specifics will not be elaborated further. Figure 13 The eye diagram 1311 shown is the eye diagram corresponding to the optical signal output by modulation only through a laser. Figure 13 The eye diagram 1321 shown is the eye diagram corresponding to the optical signal output by modulation only through the modulator. Figure 13 The eye diagram 1331 shown is the eye diagram corresponding to the optical signal output by modulation only through an optical amplifier.

[0167] The modulation shown in this embodiment can be achieved through a laser, a modulator, and an optical amplifier. Figure 13 The eye diagram 1341 shown is the eye diagram corresponding to the second modulated optical signal output by the optical amplifier shown in this embodiment, after being modulated by the laser, modulator and optical amplifier.

[0168] Comparing eye diagrams 1311, 1321, 1331, and 1341, it can be seen that the second modulated optical signal shown in this embodiment can be modulated by a laser, a modulator, and an optical amplifier. Therefore, the second modulated optical signal in this embodiment has undergone modulation by a laser, a modulator, and an optical amplifier, resulting in a higher eye opening in eye diagram 1341. For a detailed explanation of the eye opening, please refer to Embodiment 1; further details will not be provided here.

[0169] When the eye height in eye diagram 1341 has a high opening, it indicates that the second modulated light signal described in this embodiment has a high extinction ratio.

[0170] See also Figure 13 As shown in the eye diagram 1341, in this embodiment, when the initial electrical signal, the first modulation electrical signal, and the second modulation electrical signal meet the second preset condition, it is possible to ensure that the region 1342 shown in the eye diagram 1341 is relatively small, which means that the jitter of the second modulation optical signal output by the optical amplifier is relatively small and the bit error rate is relatively small, so as to ensure that the signal quality is relatively good.

[0171] The beneficial effects of the optical signal acquisition method shown in this embodiment will be explained below:

[0172] As shown in this embodiment, modulation can be performed through the laser, modulator, and optical amplifier, thereby improving the extinction ratio and optical power of the second modulated optical signal output by the optical amplifier, reducing the bit error rate and jitter of the second modulated optical signal, and improving the signal quality of the second modulated optical signal.

[0173] Furthermore, the extinction ratio of the laser, modulator, and optical amplifier shown in this embodiment can be relatively small. The extinction ratio of the second modulated optical signal output by the optical amplifier is the sum of the extinction ratios of the laser, modulator, and optical amplifier. Therefore, even when the extinction ratios of the laser, modulator, and optical amplifier are relatively small, the extinction ratio of the second modulated optical signal output by the optical amplifier can still be effectively guaranteed. This effectively reduces the magnitude of the currents in the initial electrical signal received by the laser, the first modulated electrical signal received by the modulator, and the second modulated electrical signal received by the optical amplifier, thereby effectively reducing the insertion loss and modulation loss of the laser, modulator, and optical amplifier.

[0174] Because the optical amplifier shown in this embodiment can receive a first modulation electrical signal and a second modulation electrical signal with relatively small current values, it effectively reduces the current density injected into the optical amplifier, avoids optical signal catastrophic damage, and improves the reliability of the optical chip.

[0175] Compared to Embodiment 1, under the premise of achieving the same extinction ratio and optical power, the laser shown in this embodiment also has a modulation function, which allows the cavity length of the optical chip shown in this embodiment to be further reduced, thereby reducing the cost of the optical chip.

[0176] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for acquiring optical signals, characterized in that, The method includes: The laser sends an initial optical signal to the modulator based on the initial electrical signal; The modulator modulates the initial optical signal under the action of the first modulation electrical signal to generate a first modulation optical signal; The modulator sends the first modulated optical signal to the optical amplifier; The optical amplifier modulates the first modulated optical signal and amplifies its optical power under the action of the second modulated electrical signal to obtain the second modulated optical signal. The time delay difference between the first modulated electrical signal and the second modulated electrical signal is less than or equal to a preset threshold, and the modulation rates between the first modulated electrical signal and the second modulated electrical signal are equal.

2. The method according to claim 1, characterized in that, The preset threshold is half the signal period of the initial optical signal.

3. The method according to claim 1 or 2, characterized in that, Before the laser sends an initial optical signal to the modulator based on an initial electrical signal, the method further includes: The laser receives the initial electrical signal, which is a direct current signal. The laser performs electro-optical conversion under the action of the DC electrical signal to obtain the initial optical signal.

4. The method according to claim 1 or 2, characterized in that, Before the laser sends an initial optical signal to the modulator based on an initial electrical signal, the method further includes: The laser receives the initial electrical signal, and the time delay difference between the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal is less than or equal to the preset threshold. The modulation rates of the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal are equal. The laser is modulated under the action of the initial electrical signal to generate the modulated initial optical signal.

5. The method according to claim 1 or 2, characterized in that, The first modulated electrical signal has a first waveform, and the second modulated electrical signal has a second waveform. The changing trends of the first waveform and the second waveform are the same or approximately the same.

6. The method according to claim 1 or 2, characterized in that, The method further includes: The electric drive module sends the initial electrical signal to the laser; The electric drive module sends the first modulated electrical signal to the modulator; The electric drive module sends the second modulated electrical signal to the optical amplifier.

7. The method according to claim 6, characterized in that, The electric drive module includes at least one electric driver, and the method further includes: The at least one electrical driver transmits the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal.

8. The method according to claim 6, characterized in that, The method further includes: The electrical splitter receives a modulated electrical signal from the electric drive module; The electrical splitter divides the modulated electrical signal to form the first modulated electrical signal and the second modulated electrical signal; The electrical splitter sends the first modulated electrical signal to the modulator; The electrical splitter sends the second modulated electrical signal to the optical amplifier.

9. The method according to claim 6, characterized in that, The method further includes: The electrical splitter receives a modulated electrical signal from the electric drive module; The electrical splitter divides the modulated electrical signal to form the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal; The electrical splitter sends the initial electrical signal to the laser; The electrical splitter sends the first modulated electrical signal to the modulator; The electrical splitter sends the second modulated electrical signal to the optical amplifier.

10. An optical chip, characterized in that, The optical chip includes a laser, a modulator, and an optical amplifier connected in sequence. The laser is used to send an initial optical signal to the modulator based on an initial electrical signal; The modulator is used to modulate the initial optical signal under the action of the first modulation electrical signal to generate a first modulation optical signal; The modulator is used to send the first modulated optical signal to the optical amplifier; The optical amplifier is used to modulate the first modulated optical signal and amplify the optical power under the action of the second modulated electrical signal to obtain the second modulated optical signal. The time delay difference between the first modulated electrical signal and the second modulated electrical signal is less than or equal to a preset threshold, and the modulation rates between the first modulated electrical signal and the second modulated electrical signal are equal.

11. The optical chip according to claim 10, characterized in that, The laser is also used for: Receive the initial electrical signal, wherein the initial electrical signal is a DC electrical signal; Under the action of the DC electrical signal, electro-optical conversion is performed to obtain the initial optical signal.

12. The optical chip according to claim 10, characterized in that, The laser is also used for: The initial electrical signal is received, and the time delay difference between the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal is less than or equal to the preset threshold, and the modulation rates of the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal are equal. The initial electrical signal is modulated to generate the modulated initial optical signal.

13. The optical chip according to any one of claims 10 to 12, characterized in that, The laser, the modulator, and the optical amplifier are monolithically integrated.

14. An optical module, characterized in that, The optical module includes a laser, a modulator, and an optical amplifier connected in sequence, and also includes an electric drive module connected to the laser, the modulator, and the optical amplifier respectively. The electric drive module is used to send an initial electrical signal to the laser, a first modulated electrical signal to the modulator, and a second modulated electrical signal to the optical amplifier. The laser is used to send an initial optical signal to the modulator according to the initial electrical signal; The modulator is used to modulate the initial optical signal under the action of the first modulating electrical signal to generate a first modulated optical signal; The modulator is used to send the first modulated optical signal to the optical amplifier; The optical amplifier is used to modulate the first modulated optical signal and amplify its optical power under the action of the second modulated electrical signal to obtain a second modulated optical signal. The time delay difference between the first modulated electrical signal and the second modulated electrical signal is less than or equal to a preset threshold, and the modulation rates between the first modulated electrical signal and the second modulated electrical signal are equal.

15. The optical module according to claim 14, characterized in that, The electric drive module includes at least one electric driver, which is used to transmit the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal.

16. The optical module according to claim 14 or 15, characterized in that, The optical module further includes an electrical splitter, which is connected to the electrical drive module. The electrical splitter is also connected to the modulator and the optical amplifier, respectively. The electrical splitter is used for: Receive modulated electrical signals from the electric drive module; The modulated electrical signal is divided to form the first modulated electrical signal and the second modulated electrical signal; The first modulated electrical signal is sent to the modulator; The second modulated electrical signal is sent to the optical amplifier.

17. The optical module according to claim 14 or 15, characterized in that, The optical module further includes an electrical splitter, which is connected to the electrical drive module. The electrical splitter is also connected to the laser, the modulator, and the optical amplifier, respectively. The electrical splitter is used for: Receive modulated electrical signals from the electric drive module; The modulated electrical signal is divided to form the initial electrical signal, the first modulated electrical signal, and the second modulated electrical signal; The initial electrical signal is sent to the laser; The first modulated electrical signal is sent to the modulator; The second modulated electrical signal is sent to the optical amplifier.

18. An optical network device, characterized in that, The optical network device includes the optical module as described in any one of claims 14 to 17.

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