CN114095114A - Multi-wavelength multiplexing laser transmitter - Google Patents
Multi-wavelength multiplexing laser transmitter Download PDFInfo
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- CN114095114A CN114095114A CN202111391629.XA CN202111391629A CN114095114A CN 114095114 A CN114095114 A CN 114095114A CN 202111391629 A CN202111391629 A CN 202111391629A CN 114095114 A CN114095114 A CN 114095114A
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- H—ELECTRICITY
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- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The present disclosure discloses a multi-wavelength multiplexing laser transmitter, comprising: a light source configured to emit a plurality of lights of different frequencies, wherein at least two lights of the plurality of lights have different polarization states; a wavelength division multiplexer configured to receive the plurality of lights and multiplex the plurality of lights to generate multiplexed signal light; and an output component configured to output the multiplexed signal light, wherein the plurality of lights are respectively input to a plurality of channels of the wavelength division multiplexer.
Description
Technical Field
The present disclosure relates to the field of optical communications technologies, and in particular, to a multi-wavelength multiplexing laser transmitter, and more particularly, to a multi-wavelength multiplexing laser transmitter capable of suppressing a four-wave mixing effect.
Background
With the development of data centers and fixed telecommunication networks, high-speed multi-wavelength multiplexing optical transmitter devices have great demands in data transmission applications. Due to the nonlinear effect of the optical fiber, a new light wave is generated by the four-wave mixing effect generated in the transmission of the signal light. If the frequency of the new optical wave overlaps with the operating frequency range of the system, crosstalk may occur in the system, and the generated crosstalk will reduce the channel utilization and the transmission distance of signals, thereby seriously reducing the performance of the multi-channel system. Particularly for the zero dispersion band around 1.3 μm, the four-wave mixing effect may be particularly significant because the dispersion coefficient approaches zero in this band.
Although the four-wave mixing phenomenon can be suppressed by adopting the non-zero dispersion fiber and the large effective area fiber at present, the measures are usually improvement measures aiming at a system level, and the cost is high and the upgrading difficulty is high.
Therefore, there is a need for an improved means of device level that can suppress the effects of four-wave mixing.
Disclosure of Invention
The present disclosure provides a multi-wavelength multiplexed laser transmitter capable of suppressing occurrence of a four-wave mixing effect.
According to an aspect of the present disclosure, there is provided a multi-wavelength multiplexed laser transmitter, which may include: a light source configured to emit a plurality of lights of different frequencies, wherein at least two lights of the plurality of lights have different polarization states; a wavelength division multiplexer configured to receive the plurality of lights and multiplex the plurality of lights to generate multiplexed signal light; and an output component configured to output the multiplexed signal light, wherein the plurality of lights are respectively input to a plurality of channels of the wavelength division multiplexer.
In one example, the frequencies of the at least two lights satisfy: frequency f calculated according toFWX＝2f1-f2Within a receivable frequency range of said wavelength division multiplexer, wherein f1And f2Respectively the frequencies of the at least two lights.
In another example, the light of adjacent frequencies of the plurality of lights may have polarization states orthogonal to each other, wherein the plurality of lights are respectively input to the plurality of channels of the wavelength division multiplexer in an order of increasing or decreasing frequency.
In another example, the light source includes a plurality of laser emitters that emit light at respective frequencies, the active region material of at least one of the plurality of laser emitters having a strain such that the light emitted by the at least one laser emitter has a polarization state corresponding to the strain of the active region material.
In another example, the four-wave mixing effect occurs between lights having the same polarization state, and the four-wave mixing effect does not occur between lights having polarization states orthogonal to each other.
In another example, the multi-wavelength multiplexed laser transmitter may further include: a polarization independent isolator configured to receive the multiplexed signal light from the wavelength division multiplexer and propagate the multiplexed signal light to the output assembly along a beam propagation direction and prevent light propagation in a direction opposite to the beam propagation direction.
In another example, the output component may be a focusing lens.
In another example, the multi-wavelength multiplexed laser transmitter may further include: a plurality of collimating lenses configured to receive the plurality of lights from the plurality of laser emitters and to collimate the plurality of lights respectively up to the plurality of lanes of the wavelength division multiplexer.
In another example, the multi-wavelength multiplexed laser transmitter may further include: a cartridge assembly, wherein the cartridge assembly comprises: an enclosure configured to enclose the plurality of laser emitters, the wavelength division multiplexer, and the output assembly, wherein first and second openings are disposed on front and rear surfaces of the enclosure; a glass window disposed on the first opening and configured to guide an output of the multiplexed signal light; and the ceramic circuit is provided with a micro-strip circuit, part of the ceramic circuit penetrates through the second opening to be electrically connected with the micro-strip circuit on the semiconductor substrate, and the ceramic circuit and the tube shell are hermetically packaged in a welding mode.
In another example, the cartridge assembly may further include: and a boss provided on a lower surface of the case for supporting the plurality of laser emitters, the wavelength division multiplexer, and the output module, wherein the plurality of laser emitters are eutectic-fixed to a laser substrate by using gold-tin solder, and the laser substrate is eutectic-fixed to the boss by using low temperature solder, and the wavelength division multiplexer and the output module are fixed to the boss by using ultraviolet curing glue.
In another example, the different frequencies of light may be 235.4THz, 234.6THz, 233.8THz, 233THz, 231.4THz, 230.6THz, 229.8THz, 229THz, respectively.
In another example, the multi-wavelength multiplexed laser transmitter may further include: the optical fiber coupler comprises a core inserting sleeve component, wherein the core inserting sleeve component and the tube shell component are fixed in a laser welding mode, and an inclined plane core inserting with an angle of 4-8 degrees is arranged in the core inserting sleeve component so as to couple the multiplexing signal light to external optical fiber equipment.
It should be understood that the statements in this section do not necessarily identify key or critical features of the embodiments of the present disclosure, nor do they limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.
Drawings
The drawings are included to provide a better understanding of the present solution and are not to be construed as limiting the present disclosure. Wherein:
fig. 1 is a schematic structural diagram of a multi-wavelength multiplexed laser transmitter according to an example embodiment of the present disclosure;
FIG. 2 is a top view of a multi-wavelength multiplexed laser transmitter according to an example embodiment of the present disclosure; and
fig. 3A and 3B are schematic diagrams respectively illustrating a cartridge assembly according to an example embodiment of the present disclosure.
Detailed Description
Exemplary embodiments of the present disclosure are described below with reference to the accompanying drawings, in which various details of embodiments of the present disclosure are included to assist understanding, and which are to be considered as merely exemplary. Accordingly, those of ordinary skill in the art will recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Also, descriptions of well-known functions and constructions are omitted in the following description for clarity and conciseness.
Fig. 1 is a block diagram of a multi-wavelength multiplexed laser transmitter 100 according to an example embodiment of the present disclosure.
As shown in fig. 1, a multi-wavelength multiplexed laser transmitter 100 according to an example embodiment of the present disclosure may include: an optical source 110, a wavelength division multiplexer 120, and an output assembly 130. The light source 110 may be configured to emit a plurality of lights of different frequencies, wherein at least two of the plurality of lights have different polarization states. For example, the light source 110 may include a plurality of laser emitters, such as the laser emitters 111 to 114.
To achieve multiplexing of multiple wavelengths, the plurality of laser transmitters 111 to 114 may be configured to transmit a plurality of lights of different frequencies. For example, the plurality of laser emitters 111 to 114 may be lasers disposed on a laser substrate for emitting light of respective frequencies. Each of the plurality of Laser transmitters 111 to 114 may be a Direct Modulated Laser (DML) Laser or an electro absorption Modulated Laser (EML) Laser.
The wavelength division multiplexer 120 may be configured to receive the plurality of lights and multiplex the plurality of lights to generate multiplexed signal light. Specifically, the wavelength division multiplexer may be an N × 1-way wavelength division multiplexer, that is, the wavelength division multiplexer may have a plurality of channels to respectively receive the plurality of lights from the plurality of laser transmitters.
The output component 130 may be configured to output the multiplexed signal light to export the multiplexed signal light outside of the multi-wavelength multiplexed laser transmitter.
Although multi-wavelength multiplexing can be realized in the laser transmitter structure shown in fig. 1, four-wave mixing (FWM) may occur in a plurality of lights emitted from the plurality of laser transmitters. Four-wave mixing is a nonlinear effect based on third-order optical nonlinearities. Specifically, when the wavelength of the light wave is near the zero dispersion point of the single-mode fiber, and the polarization directions of electromagnetic fields of the light wave of the three frequencies are basically the same and meet the phase matching condition, the light wave of the fourth frequency can be generated. In the application scenario of the communication system, the light with the new frequency generated by the four-wave mixing effect is often the same as the frequency of the existing signal light in the system orClose together and thus cause severe crosstalk. In a specific example, when the frequencies of two optical waves of the three optical waves are the same and the phase matching condition is satisfied, a four-wave mixing effect can also be generated. That is, when two lights having different frequency components propagate in a nonlinear medium such as an optical fiber and a nonlinear crystal, the two lights will interact to generate a new frequency fFWXWherein the new frequency fFWXCan be expressed as follows:
fFWX＝2f1-f2formula (1)
Wherein f is1And f2Respectively the frequencies of the at least two lights.
When a new frequency f is generated due to the four-wave mixing effectFWXThe four-wave mixing effect will interfere with the communication quality of the system communication when the operating frequency range of the communication system is within or close to or the same as the frequency of the signal light, and especially, in the case where at least two lights subjected to the four-wave mixing have the same polarization state, the effect of the four-wave mixing effect on the system communication will be more significant.
To reduce or eliminate the effect of such four-wave mixing effects, example embodiments of the present disclosure propose to set the polarization states of the at least two lights to be different from each other, and further, to be orthogonal to each other, to reduce or eliminate the four-wave mixing effect between the at least two lights.
A multi-wavelength multiplexed laser transmitter 200 according to an example embodiment of the present disclosure is described below with reference to fig. 2.
Similar to the structure shown in fig. 1, the multi-wavelength multiplexed laser transmitter 200 shown in fig. 2 may include an optical source including a plurality of laser transmitters 211 to 214, a wavelength division multiplexer 220, and an output assembly 230. In addition, the multi-wavelength multiplexed laser transmitter 200 may further include a package assembly 3 for enclosing optical devices, a flexible circuit board 4 for transmitting electrical signals, and a ferrule assembly 5 for interfacing with external devices or systems, as shown in fig. 2. The inclined plane lock pin with the angle of 4-8 degrees is arranged inside the lock pin sleeve component 5, so that the energy reflected back to the laser by the end face of the optical fiber is reduced. The flexible circuit board 4 may be electrically connected with the case assembly 3, and the ferrule holder assembly 5 may be fixed to the case assembly 3 by laser welding.
As shown, a first wavelength laser 211, a second wavelength laser 212, a third wavelength laser 213, a fourth wavelength laser 214 are disposed on a laser substrate 215 and configured to emit light of different frequencies, wherein the laser substrate 215 may be a semiconductor substrate on which a microstrip circuit for conducting an electrical signal to each laser is disposed. In one example, the first wavelength laser 211, the second wavelength laser 212, the third wavelength laser 213, and the fourth wavelength laser 214 may be mounted on the laser substrate 215 with the anode up and the cathode down, wherein the cathode of each laser may be electrically connected to the microstrip circuit on the laser substrate 215 by means of gold-tin solder eutectic bonding, and the anode thereof may be electrically connected to the microstrip circuit on the laser substrate 215 by means of gold wire bonding. For example, the first to fourth wavelength lasers 211 to 214 may be semiconductor lasers constituted by semiconductor laser diodes whose output light is linearly polarized light and whose polarization direction is one of TE and TM. The specific polarization direction of the output light is determined by the gain of the laser active region material in different polarization directions and the loss of the waveguide in different polarization directions in combination.
In general, the receive frequencies of the channels of the wavelength division multiplexer are equally spaced. For example, for the four-channel wavelength division multiplexer 220, if the frequencies of the light received via its four channels are respectively denoted as f1，f2，f3，f4Then f is2-f1＝f3-f2＝f4-f3. In the example embodiment of the present disclosure, the plurality of lights generated by the first to fourth wavelength lasers 211 to 214 are respectively input to the four channels of the four-channel wavelength division multiplexer 220 in an order of increasing or decreasing frequency. In this configuration, it can be known from equation 1) above that four-wave mixing of light in two adjacent channels generates interference light having the same or similar frequency as that of light propagating in the channel adjacent thereto, and therefore, communication quality of the system is degraded.
In order to avoid interference to the signal light due to the four-wave mixing effect between the two beams of light, in an example embodiment of the present disclosure, the light of adjacent frequencies among the plurality of lights having different frequencies may be set to have different polarization states to reduce the four-wave mixing effect. Further, the lights of adjacent frequencies among the plurality of lights may be set to have polarization states orthogonal to each other, thereby suppressing four-wave mixing between the light beams. That is, for the configuration shown in FIG. 2, the frequency f can be adjusted by1/f3Is set to the polarization direction of the light (1-channel, 3-channel input to the wavelength division multiplexer 220, respectively) with the frequency f2/f4Are orthogonal to each other, to ensure that substantially no four-wave mixing occurs between the beams of adjacent channels, i.e., at a frequency f1，f2Between corresponding beams of light of frequency f2，f3Between corresponding beams and at a frequency f3，f4Substantially no four-wave mixing occurs between the respective beams. That is, in this case, the four-wave mixing effect occurs only between the light beams having the same polarization state, and substantially no four-wave mixing effect occurs between the light beams having the polarization states orthogonal to each other. For example, with respect to 8-channel signal lights having frequencies of 235.4THz, 234.6THz, 233.8THz, 233THz, 231.4THz, 230.6THz, 229.8THz, and 229THz of 400GBASE-FR8 and 400GBASE-LR8 defined in the IEEE 802.3bs standard, when the 8-channel signal lights are multiplexed, a significant four-wave mixing effect may occur between signal lights of adjacent frequencies. By using the above-described polarization control method, that is, setting the light of adjacent frequencies to have polarization states orthogonal to each other and sequentially inputting the 8 signals to each channel of the wavelength division multiplexer in the order of increasing or decreasing the frequency, the frequency interval of the signal light in which four-wave mixing is likely to occur becomes large, so that the four-wave mixing effect is greatly reduced without significantly affecting the system performance.
In another example, 4 wavelengths of 200GBASE-LR4, 100GLR4, and 100G ER4 defined by IEEE 802.3bs and IEEE 802.3ba standards, that is, the center wavelengths of the first wavelength laser 21, the second wavelength laser 22, the third wavelength laser 23, and the fourth wavelength laser 24 are 1295.56nm, 1300.05nm, 1304.58nm, and 1309.14nm in this order, and the corresponding frequencies are 231.4THz, 230.6THz, 229.8THz, and 229THz in this order, where the frequency interval is 800GHz, may also be used. On this basis, a multi-wavelength multiplexed laser transmitter capable of suppressing the four-wave mixing effect is provided by using the method of the exemplary embodiment of the present disclosure.
To achieve control of polarization, quantum well strain methods may be employed. In example embodiments of the present disclosure, polarization control of at least two of the plurality of light emitted by the plurality of laser emitters is achieved by controlling a respective active region material of at least one of the plurality of laser emitters to have a strain such that the light emitted by the at least one laser emitter has a polarization state corresponding to the strain of its active region material. For example, the application of active region material of lasers emitting light of adjacent frequencies is controlled such that the light of the adjacent frequencies have orthogonal polarization states. In one example, by applying a compressive strain in the horizontal direction, carrier transitions can be made to occur between the conduction band and the valence band heavy hole band, thereby emitting laser light having a transverse electric mode (TE mode); alternatively, by applying a tensile strain in the horizontal direction, carrier transition can occur between the conduction band and the valence band light hole band, and laser light having a transverse magnetic mode (TM mode) can be emitted. In embodiments of the present disclosure, strain control of the respective active region materials of the first wavelength laser 211 to the fourth wavelength laser 214 may be performed by employing a quantum well strain method such that the first wavelength laser 211 and the third wavelength laser 213 lase in the TE mode and the second wavelength laser 212 and the fourth wavelength laser 214 lase in the TM mode, or vice versa. In this way, control of the polarization state of the plurality of lights is achieved. In addition, those skilled in the art will recognize that other methods than quantum well strain methods may be used to achieve control of the polarization state of the laser light such that adjacent frequencies of light have orthogonal polarization states, and such schemes do not depart from the concepts of the present application.
The polarization-controlled plurality of lights form multiplexed signal lights after being respectively input to the plurality of channels of the wavelength division multiplexer 220. The wavelength division multiplexer 220 transmits the multiplexed signal light to the output assembly 230 to output the multiplexed signal light to the outside. The output component 230 may include a focusing lens, such as an aspheric lens or a spherical lens.
Therefore, according to an exemplary embodiment of the present disclosure, by configuring a polarization state of each of a plurality of lights emitted by a plurality of laser emitters and inputting the plurality of lights to a wavelength division multiplexer in a specific order, and in particular, by setting polarization states of adjacent wavelengths of the plurality of lights emitted by the plurality of laser emitters to be orthogonal to each other and sequentially inputting the polarization-controlled plurality of lights to respective channels of the wavelength division multiplexer in an increasing or decreasing order of wavelength, it is possible to provide a multi-wavelength-multiplexed laser emitter having a characteristic of reducing a four-wave mixing effect or eliminating the four-wave mixing effect.
It should be apparent to those skilled in the art that although the above description is made of sequentially inputting a plurality of lights into a plurality of channels of a wavelength division multiplexer in order of increasing frequencies, exemplary embodiments of the present disclosure are not limited thereto, and a plurality of lights emitted from a plurality of laser emitters may also be sequentially input into corresponding channels of a wavelength division multiplexer in order of decreasing frequencies.
Furthermore, as shown in fig. 2, the multi-wavelength multiplexed laser transmitter 200 may additionally include a polarization-independent isolator 240, and the polarization-independent isolator 240 may be configured to receive the multiplexed signal light having two polarization directions from the wavelength division multiplexer 220, to propagate the multiplexed signal light to the output assembly 230 in a beam propagation direction, and to block light propagation in a direction opposite to the beam propagation direction, thereby protecting the laser transmitter from being damaged by reflected light. That is, in fig. 2, the multiplexed signal light generated by the wavelength division multiplexer 220 is transmitted in the beam propagation direction through the polarization independent isolator 240 and focused through the output member 230 such as a focusing lens to the glass window (see reference numeral 32 in fig. 3A) located on the front surface of the package assembly 3 so as to be guided into the ferrule assembly 5. The polarization independent isolator 240 is capable of deflecting light that counter-propagates as a result of the light beam incident on the device surface by a deflection angle with respect to its direction of propagation. In the present embodiment, the reflected light is deviated from the original direction by 1.1 degrees after passing through the polarization-independent isolator 240, thereby preventing the reflected light from being fed back to the first wavelength laser 211 to the fourth wavelength laser 214. Experimental data show that the structure can realize the isolation degree of more than 35dB within the temperature range of-40-85 ℃.
In another exemplary embodiment, a plurality of collimator lenses 250 respectively corresponding thereto may be further provided downstream in the optical path of the first wavelength laser 211 to the fourth wavelength laser 214. The plurality of collimating lenses 250 may be configured to receive the plurality of lights from the first wavelength laser 211 to the fourth wavelength laser 214 and to collimate the plurality of lights up to a plurality of lanes of the wavelength division multiplexer 220, respectively. Each collimating lens 250 may be implemented as an aspheric lens that may convert light from the phase-stressing light emitter into a collimated light beam and cause the collimated light beam to be incident on a corresponding channel of the wavelength division multiplexer 220.
Having described the structure of the multi-wavelength multiplexed laser transmitter according to the inventive concept, it is possible to provide a multi-wavelength multiplexed laser transmitter having a characteristic of reducing or eliminating a four-wave mixing effect by configuring a polarization state of each of a plurality of lights emitted from a plurality of laser transmitters and inputting the plurality of lights to a wavelength division multiplexer in a specific order.
Fig. 3A and 3B are schematic views respectively showing the cartridge assembly 3 according to an example embodiment of the present disclosure.
In particular, fig. 3A shows a schematic view of the cartridge assembly 3 without the cover plate. The package assembly 3 may include a package 31, a glass window 32, and a ceramic circuit 33. The package 31 may be configured to enclose an optical component of a multi-wavelength multiplexed laser transmitter, wherein the package 31 is provided with a first opening and a second opening on a front surface and a rear surface thereof. A glass window 32 is disposed over the first opening and is configured to direct an output of the multiplexed signal light. The glass window 32 may be fixed to the case 31 by low temperature glass solder welding and hermetically sealed to prevent interference from the external environment. The ceramic circuit 33 may be a multilayer ceramic circuit provided with a microstrip circuit. A part of the ceramic circuit 33 may pass through the second opening to be electrically connected to the microstrip circuit on the laser substrate 215 shown in fig. 2 by means of gold wire connection, and another part thereof may be electrically connected to the flexible circuit board 4. The ceramic circuit is joined to the package by soldering, for example, with gold-tin solder, to ensure a hermetic package. In one example, when the first to fourth wavelength lasers 211 to 214 are implemented as direct modulation lasers, the respective laser substrate 215, ceramic circuit 33, and flexible circuit board 4 may have four sets of differential microstrip circuits and differential characteristic impedance of 50 ± 5 Ω, or may have four sets of single-ended microstrip circuits and single-ended characteristic impedance of 25 ± 2.5 Ω. When the first to fourth wavelength lasers 211 to 214 are implemented as electro-absorption modulated lasers, the corresponding laser substrate 215, ceramic circuit 33, and flexible circuit board 4 may have four sets of single-ended microstrip circuits and the single-ended characteristic impedance is 50 ± 5 Ω.
In one example, the package assembly 3 may further include a boss 34 disposed on a lower surface of the package 31 and configured to support optical devices included in the multi-wavelength multiplexed laser transmitter 200, for example, the plurality of laser transmitters 211 to 214, the wavelength division multiplexer 220, the output assembly 230, and the like. In another example, the on-chip optics of the plurality of laser emitters 211-214 may be eutectic-bonded to the laser substrate 215 using gold-tin eutectic bonding, and the laser substrate 215 may be eutectic-bonded to the mesa 34 using a low temperature solder, for example. Specifically, the plurality of laser emitters 211 through 214 may be eutectic-fixed to the mesa by using a low temperature solder of, for example, 95.6Sn-3.5Ag-0.9cu (+ -1%) material, which has a melting point of 217 ℃. In addition, separate optical devices such as the wavelength division multiplexer 220 and the output assembly 230 may be fixed to the boss 34 by using an ultraviolet curing adhesive.
Fig. 3B shows a schematic illustration of the cartridge assembly 3 with the cover plate 35. The cover 35 is hermetically sealed to the package 31 by resistance welding to prevent interference from the external environment with the optical device enclosed by the package 31.
In addition, the package assembly 3 shown in fig. 3A and 3B may be electrically connected to the flexible circuit board 4 shown in fig. 2 by electrically connecting the ceramic circuit 12 to the flexible circuit board 4 through solder thermocompression bonding, so as to support the electrical signal to be transmitted to the ceramic circuit 33 of the package assembly 3 through the flexible circuit board 4 and then to the laser substrate 215, so as to drive the first wavelength laser 211, the second wavelength laser 212, the third wavelength laser 213, and the fourth wavelength laser 214 to emit a plurality of lights with different frequencies.
It can be seen that the present disclosure provides a four-wave mixing resistant multi-wavelength multiplexed laser transmitter capable of reducing or eliminating the four-wave mixing effect generated in transmission by the multi-wavelength multiplexed laser transmitter. In particular, the present disclosure reduces the four-wave mixing effect by differentiating the polarization state of multiplexed light having different wavelengths. More specifically, the present disclosure controls the polarization of light emitted by each laser emitter by adopting a reasonable laser polarization direction distribution scheme for each channel of the wavelength division multiplexer, so that the signal light of adjacent wavelengths does not generate a four-wave mixing effect due to orthogonal polarization directions, and an effect of eliminating four-wave mixing between the light of adjacent wavelengths is achieved. In summary, the device-level improvement proposed by the present disclosure does not require modification of the existing optical fiber system, and has the characteristics of miniaturization, integration, low cost, and long transmission distance.
Example embodiments have been disclosed herein, and although specific terms are employed, they are used and are to be interpreted in a generic and descriptive sense only and not for purposes of limitation. In some instances, it will be apparent to one of ordinary skill in the art at the time of filing this application that the features, characteristics, and/or elements described in connection with a particular embodiment may be used alone or in combination with the features, characteristics, and/or elements described in connection with other embodiments unless explicitly stated otherwise.
Further, it should also be noted that although the present disclosure illustrates the inventive concept with four-beam multiplexing including 4 laser transmitters and 4-way laser wavelength division multiplexers, the present disclosure is not so limited. The inventive concept can be applied to multiplexing between beams having a greater or lesser number.
The above detailed description should not be construed as limiting the scope of the disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions may be made in accordance with design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present disclosure should be included in the scope of protection of the present disclosure.
Claims (10)
1. A multi-wavelength multiplexed laser transmitter comprising:
a light source configured to emit a plurality of lights of different frequencies, wherein at least two lights of the plurality of lights have different polarization states;
a wavelength division multiplexer configured to receive the plurality of lights and multiplex the plurality of lights to generate multiplexed signal light; and
an output component configured to output the multiplexed signal light,
wherein the plurality of lights are respectively input to a plurality of channels of the wavelength division multiplexer.
2. The multi-wavelength multiplexed laser transmitter of claim 1 wherein the frequencies of the at least two lights satisfy: frequency f calculated according toFWX＝2f1-f2Within a receivable frequency range of said wavelength division multiplexer, wherein f1And f2Respectively the frequencies of the at least two lights.
3. The multi-wavelength multiplexed laser transmitter of claim 1 wherein adjacent frequencies of light in the plurality of lights have polarization states that are orthogonal to each other,
wherein the plurality of lights are respectively input to the plurality of channels of the wavelength division multiplexer in an order of increasing or decreasing frequency.
4. The multi-wavelength multiplexed laser transmitter of claim 1 or 3 wherein the light source comprises a plurality of laser transmitters that emit light at respective frequencies, the active region material of at least one of the plurality of laser transmitters having a strain such that the light emitted by the at least one laser transmitter has a polarization state corresponding to the strain of the active region material.
5. The multi-wavelength multiplexed laser transmitter of claim 1 further comprising: a polarization independent isolator configured to receive the multiplexed signal light from the wavelength division multiplexer and propagate the multiplexed signal light to the output assembly along a beam propagation direction and prevent light propagation in a direction opposite to the beam propagation direction.
6. The multi-wavelength multiplexed laser transmitter of claim 1 wherein the output component is a focusing lens.
7. The multi-wavelength multiplexed laser transmitter of claim 1 further comprising: a plurality of collimating lenses configured to receive the plurality of light from the light source and to collimate the plurality of light respectively up to the plurality of channels of the wavelength division multiplexer.
8. The multi-wavelength multiplexed laser transmitter of claim 1 wherein the different frequencies of light are respectively: 235.4THz, 234.6THz, 233.8THz, 233THz, 231.4THz, 230.6THz, 229.8THz, 229 THz.
9. The multi-wavelength multiplexed laser transmitter of claim 1 further comprising: a cartridge assembly, wherein the cartridge assembly comprises:
an enclosure configured to enclose the plurality of laser emitters, the wavelength division multiplexer, and the output assembly, wherein first and second openings are disposed on front and rear surfaces of the enclosure;
a glass window disposed on the first opening and configured to guide an output of the multiplexed signal light; and
and the ceramic circuit is provided with a micro-strip circuit, part of the ceramic circuit penetrates through the second opening to be electrically connected with the micro-strip circuit on the semiconductor substrate, and the ceramic circuit and the tube shell are hermetically packaged in a welding mode.
10. The multi-wavelength multiplexed laser transmitter of claim 1, wherein a boss is provided on a lower surface of the package for supporting the plurality of laser transmitters, the wavelength division multiplexer, and the output assembly,
wherein the plurality of laser emitters are eutectic-fixed to a laser substrate by using gold-tin solder, the laser substrate is eutectic-fixed to the boss by using low temperature solder, and the wavelength division multiplexer and the output assembly are fixed to the boss by using ultraviolet curing glue.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023186139A1 (en) * | 2022-03-31 | 2023-10-05 | 华为技术有限公司 | Optical communication method, apparatus and system |
| WO2024036975A1 (en) * | 2022-08-16 | 2024-02-22 | 青岛海信宽带多媒体技术有限公司 | Optical module |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101455018A (en) * | 2006-05-26 | 2009-06-10 | 泰科电讯（美国）有限公司 | Optical communication system and method using optical channels with pair-wise orthogonal relationship |
| CN101523252A (en) * | 2005-01-10 | 2009-09-02 | 泰科电讯（美国）有限公司 | Apparatus for forming a WDM signal having orthogonally polarized optical channels |
| CN109061802A (en) * | 2018-10-17 | 2018-12-21 | 四川光恒通信技术有限公司 | A kind of hermetically sealed transmitting optical device of multichannel wavelength-division palarization multiplexing cell type |
-
2021
- 2021-11-23 CN CN202111391629.XA patent/CN114095114A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101523252A (en) * | 2005-01-10 | 2009-09-02 | 泰科电讯（美国）有限公司 | Apparatus for forming a WDM signal having orthogonally polarized optical channels |
| CN101455018A (en) * | 2006-05-26 | 2009-06-10 | 泰科电讯（美国）有限公司 | Optical communication system and method using optical channels with pair-wise orthogonal relationship |
| CN109061802A (en) * | 2018-10-17 | 2018-12-21 | 四川光恒通信技术有限公司 | A kind of hermetically sealed transmitting optical device of multichannel wavelength-division palarization multiplexing cell type |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023186139A1 (en) * | 2022-03-31 | 2023-10-05 | 华为技术有限公司 | Optical communication method, apparatus and system |
| WO2024036975A1 (en) * | 2022-08-16 | 2024-02-22 | 青岛海信宽带多媒体技术有限公司 | Optical module |
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