CN110596847B - Etalon packaging structure and wavelength locking device - Google Patents
Etalon packaging structure and wavelength locking device Download PDFInfo
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- CN110596847B CN110596847B CN201910894230.XA CN201910894230A CN110596847B CN 110596847 B CN110596847 B CN 110596847B CN 201910894230 A CN201910894230 A CN 201910894230A CN 110596847 B CN110596847 B CN 110596847B
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/008—Mountings, adjusting means, or light-tight connections, for optical elements with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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Abstract
The embodiment of the invention discloses an etalon packaging structure and a wavelength locking device. The etalon packaging structure includes: the etalon is arranged on the fixing piece; one end of the temperature-sensitive connecting piece is connected with the fixing piece; the other end of the temperature-sensitive connecting piece is fixed; the size of the temperature-sensitive connecting piece changes along with the change of the environmental temperature; under the condition that the size of the temperature-sensitive connecting piece changes, the fixing piece rotates around the fixed point to enable the etalon to rotate, and the rotation of the etalon is used for changing the reflection angle of the light beam in the etalon; wherein the change in temperature and the change in the reflection angle of the beam within the etalon maintain the beam constant at the peak transmission wavelength of the etalon.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to an etalon packaging structure and a wavelength locking device.
Background
In an optical communication network, a plurality of fixed wavelength lasers are replaced by adjustable lasers, so that the system complexity can be effectively reduced, and the system mode is simplified. However, the tunable laser may experience wavelength drift during its lifetime due to laser aging, which causes crosstalk between adjacent channels and results in systematic errors.
At present, wavelength drift can be eliminated by adopting a mode of calibrating the laser wavelength again by using a wavelength locking device, and the wavelength of the laser can be tuned to a specified wavelength. The wavelength locking device generally uses an etalon or a thin film filter for wavelength calibration, and the wavelength of the etalon or the thin film filter is sensitive to temperature, so a semiconductor Cooler (TEC) is generally used to control the temperature of the etalon or the thin film to achieve the stability of wavelength calibration. There is no effective solution for stabilizing the wavelength of the etalon or thin film filter without using a semiconductor refrigerator.
Disclosure of Invention
In order to solve the existing technical problems, embodiments of the present invention provide an etalon packaging structure and a wavelength locking device.
In order to achieve the above purpose, the technical solution of the embodiment of the present invention is realized as follows:
the embodiment of the invention provides an etalon packaging structure, which comprises: the etalon is arranged on the fixing piece; one end of the temperature-sensing connecting piece is connected with the fixing piece; the other end of the temperature-sensitive connecting piece is fixed;
the size of the temperature-sensitive connecting piece changes along with the change of the environmental temperature;
under the condition that the size of the temperature-sensitive connecting piece changes, the fixing piece rotates around the fixed point to enable the etalon to rotate, and the rotation of the etalon is used for changing the reflection angle of the light beam in the etalon;
wherein the change in temperature and the change in the reflection angle of the beam within the etalon maintain the beam constant at the peak transmission wavelength of the etalon.
In the above scheme, the temperature-sensitive connecting piece is a connecting rod; the connecting rod is made of a material with an expansion coefficient higher than a first preset threshold value.
In the above solution, the fixing member includes a first substrate, and the etalon packaging structure further includes a fixed second substrate; the etalon is arranged on the first substrate; one end of the temperature-sensing connecting piece is connected with the first substrate, and the other end of the temperature-sensing connecting piece is connected with the second substrate.
In the above solution, a through hole is provided at a fixed point of the first substrate, a threaded hole is provided on the second substrate, and a screw penetrating through the through hole is fixed in the threaded hole, so that the first substrate can rotate around the fixed point.
In the above scheme, the first substrate and the second substrate are made of materials having expansion coefficients lower than a second preset threshold.
In the above scheme, the length of the connecting rod is related to the compensation period of the peak transmission wavelength of the etalon; the compensation period is determined based on a degree of temperature change of an environment in which the etalon is located.
In the scheme, spring structures are arranged at two ends of the temperature-sensitive connecting piece; one end of the temperature-sensing connecting piece is connected with the first substrate through a spring structure, and the other end of the temperature-sensing connecting piece is connected with the second substrate through a spring structure.
In the above scheme, a gasket is arranged between the screw and the first substrate.
In the above solution, the etalon packaging structure further includes: the first photoelectric converter is arranged on an emergent light path of the etalon and used for receiving a first light signal emitted by the etalon and converting the first light signal into a first electric signal.
In the above aspect, the first photoelectric converter is disposed on the first substrate.
The embodiment of the invention also provides a wavelength locking device, which comprises: the etalon packaging structure comprises a tunable laser, a first optical splitter, a second photoelectric converter and the etalon packaging structure; wherein the content of the first and second substances,
the first optical splitter is arranged on a light path of emergent light of the tunable laser and is used for splitting the emergent light into a second optical signal and a third optical signal; the second optical signal is vertical to the optical path of the emergent light, and the third optical signal is horizontal to the optical path of the emergent light;
the second optical splitter is arranged on an optical path of the second optical signal and is used for splitting the second optical signal into a fourth optical signal and a fifth optical signal; the fourth optical signal is horizontal to the optical path of the emergent light, and the fifth optical signal is vertical to the optical path of the emergent light;
the second photoelectric converter is arranged on an optical path of the fifth optical signal and used for receiving the fifth optical signal and converting the fifth optical signal into a second electrical signal;
and an etalon in the etalon packaging structure is arranged on a light path of the fourth optical signal.
In the above scheme, the device further comprises an isolator, wherein the isolator is arranged on a light path between the adjustable laser and the first light splitter and used for blocking light beams opposite to emergent light of the adjustable laser.
In the above scheme, the device further includes a collimating lens, and the collimating lens is disposed on the light path between the tunable laser and the isolator, and is configured to perform collimation processing on the emergent light of the tunable laser.
In the above scheme, the apparatus further comprises a converging lens and a waveguide/fiber device; the converging lens and the waveguide/optical fiber device are arranged on the light path of the three optical signals; wherein the content of the first and second substances,
and the converging lens is used for converging the third optical signal, and the converged optical signal enters the waveguide/optical fiber device.
The embodiment of the invention provides an etalon packaging structure and a wavelength locking device, wherein the etalon packaging structure comprises: the etalon packaging structure includes: the etalon is arranged on the fixing piece; one end of the temperature-sensing connecting piece is connected with the fixing piece; the other end of the temperature-sensitive connecting piece is fixed; the size of the temperature-sensitive connecting piece changes along with the change of the environmental temperature; under the condition that the size of the temperature-sensitive connecting piece changes, the fixing piece rotates around the fixed point to enable the etalon to rotate, and the rotation of the etalon is used for changing the reflection angle of the light beam in the etalon; wherein the change in temperature and the change in the reflection angle of the beam within the etalon maintain the beam constant at the peak transmission wavelength of the etalon. By adopting the technical scheme of the embodiment of the invention, the change of the environmental temperature is sensed through the size change of the temperature-sensitive connecting piece, and the etalon is driven to rotate through the fixing piece through the size change of the temperature-sensitive connecting piece, so that the compensation of the peak transmission wavelength of the etalon is realized by adjusting the reflection angle of the light beam in the etalon under the condition of the change of the environmental temperature, the drift of the peak transmission wavelength of the etalon along with the change of the temperature is reduced, a temperature control device is not required to be added, the wavelength of the etalon is kept stable, the power consumption of a module is also reduced, and the energy is saved.
Drawings
Fig. 1 is a schematic structural diagram of an etalon packaging structure according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an etalon FSR spectrum;
FIG. 3a is a schematic diagram of the relationship between the peak transmission wavelength and the reflection angle of an etalon;
FIG. 3b is a schematic diagram of the peak transmission wavelength of the etalon versus temperature;
fig. 4a is a schematic diagram of an application of an etalon packaging structure according to an embodiment of the present invention;
fig. 4b is a schematic diagram of another application of the etalon packaging structure of the embodiment of the present invention;
fig. 4c is a schematic cross-sectional view of an etalon package structure according to an embodiment of the present invention;
FIGS. 5a and 5b are schematic diagrams of the peak transmission wavelength versus temperature of an uncompensated, one-period compensated, and overcompensated etalon, respectively, according to embodiments of the present invention;
fig. 6 is a schematic structural diagram of a wavelength locking device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides an etalon packaging structure. Fig. 1 is a schematic structural diagram of an etalon packaging structure according to an embodiment of the present invention; as shown in fig. 1, the etalon package structure includes: the etalon 11, a fixing piece 12 which can rotate around a fixed point and a temperature-sensitive connecting piece 13, wherein the etalon 11 is arranged on the fixing piece 12; one end of the temperature-sensitive connecting piece 13 is connected with the fixing piece 12; the other end of the temperature-sensitive connecting piece 13 is fixed;
the size of the temperature-sensitive connector 13 changes with the change of the environmental temperature;
when the size of the temperature-sensitive connector 13 changes, the etalon 11 is rotated by rotating the fixing member 12 around the fixed point, and the rotation of the etalon 11 is used for changing the reflection angle of the light beam in the etalon 11;
wherein the change in temperature and the change in the reflection angle of the light beam within the etalon 11 maintain the peak transmission wavelength of the light beam within the etalon 11 constant.
In this embodiment, the etalon may be an interferometer formed by two flat glass or quartz plates. Taking a quartz etalon as an example, the end face of the etalon is plated with a reflecting film with specific reflectivity, and the two end faces are parallel to each other; a parallel planar dielectric layer is formed between the two coated end faces and the beam is reflected back and forth between the two coated end faces to form an interference spectrum that is related to the wavelength of the beam, as an example of an etalon FSR spectrum, as shown in fig. 2. Wherein the etalon transmission spectrum curve satisfies the following expression (1):
wherein the content of the first and second substances,
wherein, P (lambda) is an etalon transmission spectrum curve; f represents a fineness coefficient; thita represents the phase change of a single reflection of the beam within the etalon; phi denotes the reflection angle of the beam within the etalon; nt represents the refractive index of the material within the etalon; r represents an end face reflectance; pi represents a constant pi; d represents the thickness of the etalon (i.e., the distance between two end faces within the etalon); λ represents a wavelength; for example, P (λ) represents a transmission spectrum curve relating to wavelength.
According to the sellmeier dispersion formula, the relationship of the wavelength λ to the refractive index n satisfies the following expression (4):
where sqrt denotes a square root operation.
Providing a refractive index change versus temperature relationship according to corning that satisfies the following expression (5):
dn＝(C1+C2×λ -2 +C3×λ -4 +C4×λ -6 )×dt (5)
in the above expression (4) and expression (5), a1-A3, B1-B3, C1-C4 are all known coefficients; dn represents a refractive index change rate at a temperature change dt (with respect to 20 degrees, that is, n is 20 degrees).
nt＝n+dn (6)
The refractive index at a specific temperature for a specific wavelength is obtained from expressions (4), (5), and (6).
thita＝2×pi×m (7)
Wherein, when m is an integer, obtaining the etalon peak transmission wavelength lambda through an expression (3) * (hereinafter, it may be simply referred to as peak wavelength), etalon peak transmission wavelength lambda * Expression (8) is satisfied. The etalon peak transmission wavelength lambda can be obtained by expression (7) and expression (8) * The relationship to the reflection angle phi of the beam within the etalon can be expressed as:
according to the principle of interference, when the phase difference between multiple beams is 2 Xm × pi, the forward transmission is the peak wavelength λ * When the temperature changes, nt changes according to the above formulas (6) and (9), and the peak wavelength λ changes * Changes also occur. In the embodiment of the present invention, d is 2mm, R is 30%, m is 3732, and the peak wavelength λ is taken as an example * The temperature dependence was 1.25 Ghz/deg. When the temperature is not changed, the reflection angle phi of the light beam in the etalon is changed, and the peak wavelength lambda can also be changed * ，λ * Linearly with cos (phi).
It follows that the peak wavelength λ increases as the temperature increases * Drift (i.e. peak) to longer wavelengthWavelength lambda * Larger) as shown in fig. 3 b; the peak wavelength λ is increased when the reflection angle phi of the beam in the etalon becomes larger * Towards short wavelength (i.e. peak wavelength lambda) * Becomes smaller) as shown in fig. 3 a. By utilizing the above relationship, if the temperature is increased and the reflection angle phi of the light beam in the etalon is increased, the peak wavelength lambda can be adjusted * Compensating, reducing peak wavelength lambda * Drift with temperature change.
Therefore, in the embodiment, the temperature sensing connecting piece senses the change of the ambient temperature, and the fixing piece rotates around the fixed point under the condition that the temperature sensing connecting piece senses the change of the ambient temperature, so that the etalon rotates, and the reflection angle of the light beam in the etalon is changed. In practical application, if the ambient temperature rises, the fixing piece rotates around a fixed point, so that the etalon rotates to increase the reflection angle of the light beam in the etalon; if the ambient temperature is reduced, the etalon can rotate around a fixed point through the fixing piece, so that the etalon rotates, and the reflection angle of the light beam in the etalon is reduced; so that the peak transmission wavelength of the etalon remains unchanged.
By adopting the technical scheme of the embodiment of the invention, the change of the environmental temperature is sensed through the size change of the temperature-sensitive connecting piece, and then the etalon is driven to rotate through the fixing piece through the size change of the temperature-sensitive connecting piece, so that the compensation of the peak transmission wavelength of the etalon is realized by adjusting the reflection angle of the light beam in the etalon under the condition of the change of the environmental temperature, the drift of the peak transmission wavelength of the etalon along with the change of the temperature is reduced, the wavelength of the etalon is kept stable without adding a temperature control device, the power consumption of the module is also reduced, and the energy is saved.
In an alternative embodiment of the present invention, the temperature-sensitive connecting member 13 is a connecting rod; the connecting rod is made of a material with an expansion coefficient higher than a first preset threshold value. It will be appreciated that the connecting rod is of a material having a high coefficient of expansion. As an example, the connecting rod may be made of brass material, or may be made of stainless steel or other alloy material having a high coefficient of expansion.
In an alternative embodiment of the present invention, the fixing member 12 includes a first substrate, and the etalon package structure further includes a fixed second substrate; the etalon 11 is disposed on the first substrate; one end of the temperature-sensitive connecting piece 13 is connected with the first substrate, and the other end of the temperature-sensitive connecting piece 13 is connected with the second substrate. The first substrate and the second substrate are made of materials with expansion coefficients lower than a second preset threshold value. In this embodiment, the first substrate and the second substrate may be metal substrates with low expansion coefficients. As an example, the first substrate and the second substrate may employ invar (invar) or kovar (kovar).
In an alternative embodiment of the present invention, a through hole is provided at the fixing point of the first substrate, and a threaded hole is provided on the second substrate, and a screw penetrating through the through hole is fixed in the threaded hole, so that the first substrate can rotate around the fixing point. Wherein, silicone oil or other lubricating materials can be smeared between the first substrate and the second substrate.
In practical applications, the first substrate and the second substrate may be metal substrates, and for convenience of understanding, the first substrate is a first metal substrate, and the second substrate is a second metal substrate. A fixing point position can be selected according to actual conditions on the first metal substrate, a through hole is arranged at the fixing point position, a threaded hole can be arranged at the corresponding position of the first metal through hole on the second metal substrate, and a screw penetrates through the through hole of the first metal substrate and is fixed in the threaded hole of the second metal substrate. The bottom parts of the first metal substrate and the second metal substrate can be connected by welding or bonding temperature-sensitive connecting pieces.
In an optional embodiment of the present invention, two ends of the temperature-sensitive connecting piece 13 are provided with spring structures; one end of the temperature sensing connecting piece 13 is connected with the first substrate through a spring structure, and the other end of the temperature sensing connecting piece 13 is connected with the second substrate through a spring structure.
In this embodiment, the spring structure is used to offset displacement generated when the first substrate and the second substrate rotate relatively, and mainly because the first substrate and the second substrate may generate a curvature when rotating relatively, the curvature may be offset by the spring structure.
In an alternative embodiment of the invention, a spacer is arranged between the screw and the first base plate.
In the present embodiment, the gasket may be a high-elasticity gasket, and as an example, the high-elasticity gasket may be a high-elasticity resin gasket. The spacer may facilitate rotation of the first base plate about a fixed point.
In practical applications, the first substrate and the second substrate may be formed by cutting a metal substrate. For example, the metal substrate is divided into two parts by dicing, and the etalon 11 is fixedly connected to one part of the metal substrate (first substrate) by bonding; at least two through holes are formed in one side of the other part of the metal substrate (the second substrate); the connecting rod passes through at least two through holes and is fixed by a nut. The spring structure is connected with the first substrate and the second substrate, or the spring structure is connected with the first substrate and the connecting rod. When the ambient temperature rises, the connecting rod expands in the length direction; because the connecting rod is fixed by the nut, the expansion of the connecting rod drives the first substrate to rotate through the spring structure.
In an optional embodiment of the present invention, the etalon 11 packaging structure further includes: the first photoelectric converter is arranged on an emergent light path of the etalon 11 and used for receiving a first light signal emitted by the etalon 11 and converting the first light signal into a first electric signal.
In an alternative embodiment of the present invention, the first photoelectric converter is disposed on the first substrate.
In an alternative embodiment of the invention, the length of the connecting rod is related to the compensation period of the peak transmission wavelength of the etalon 11; the compensation period is determined based on a degree of temperature change of an environment in which the etalon is located.
In this embodiment, as shown in fig. 1, the FSR spectrum of the etalon has a periodic variation in wavelength. Based on this, at the wavelength λ corresponding to the peak value * In the compensation process, the peak wavelength lambda can be adjusted in one period * Compensation is carried out, the compensationThe mode has smaller reflection angle to the light beam in the etalon; or the peak wavelength lambda can be measured over more than one period * Compensation is performed in a manner that is also referred to as overcompensation and that provides a large angle of reflection for the beam within the etalon.
For example, when d is 2mm, the etalon period is 0.4nm, and the temperature is changed by 40 degrees, the peak wavelength λ is measured * Varying by one cycle. Using variation of reflection angle phi of light beam in etalon for peak wavelength lambda * Performing compensation for one period by adjusting the reflection angle phi of the light beam in the etalon to be λ * One cycle (0.4nm) is reduced and expression (9) is substituted to obtain phi (variation) ≈ 1.33 degrees. That is, when the temperature is changed from 20 degrees to 60 degrees, the reflection angle phi of the light beam in the etalon changes by 1.33 degrees, and the peak wavelength λ is changed * No change occurred. As can be seen from fig. 5a and 5b, when one period compensation is performed, the peak wavelength has the maximum under-compensation at the midpoint of the temperature because λ is the maximum under-compensation in equation 9 * ∝nt，λ * Oc cos (phi). When the reflection angle phi of the beam within the etalon varies linearly, nt × cos (phi) takes a maximum value at the temperature midpoint (40 degrees), i.e., the maximum under-compensated position.
After one period of wavelength compensation of the etalon, the peak wavelength λ is changed by 40 degrees in temperature * The drift is reduced from uncompensated 0.4nm to 0.1 nm. As can be seen from fig. 3a, the wavelength compensation effect is better at temperatures around 20 degrees and 60 degrees.
Fig. 4a is a schematic view of an application of an etalon packaging structure according to an embodiment of the present invention, and as shown in fig. 4a, the etalon packaging structure includes an etalon arrangement disposed on a first substrate 117, which is not shown in the figure, and a temperature-sensitive connector 112, a first substrate 117, and a second substrate 118 implemented by a connecting bar; the first substrate may be a first metal plate, and the second substrate may be a second metal plate; the first metal plate is provided with a through hole, the second metal plate is provided with a threaded hole at a corresponding position, and a screw penetrating through the through hole is fixed in the threaded hole, so that the first metal plate can rotate around the fixed point. Fig. 4b is a schematic diagram of another application of the etalon packaging structure of the embodiment of the present invention, as shown in fig. 4b, fig. 4b is a schematic diagram of the first substrate rotating around the fixed point by a compensation angle of 2 degrees; fig. 4c is a schematic cross-sectional view of an etalon package structure according to an embodiment of the present invention, as shown in fig. 4c, a through hole is disposed at a fixing point of the first substrate 117 in fig. 4c, a threaded hole is disposed on the second substrate 118, a screw 107 penetrating through the through hole is fixed in the threaded hole, and a spacer 113 is disposed between the screw 107 and the first substrate 117, where the spacer 113 may be a high elastic resin spacer.
Based on this, as an embodiment, the temperature variation range may be roughly determined according to the environment type where the etalon packaging structure is located, the compensation mode may be determined based on the temperature variation range, and then the length of the connecting rod may be determined based on the determined compensation mode.
For example, when the etalon packaging structure is used in an indoor environment such as a machine room, the change of the ambient temperature is small, and in the compensation scheme for the change of the indoor ambient temperature being less than 20 degrees, an overcompensation scheme can be adopted, so that the reflection angle phi of the light beam in the etalon has a larger change value, the wavelength drift can be further reduced, and the wavelength precision in the specified temperature range can be improved.
In practical applications, the length of the connecting rod may be determined by phi in the etalon compensation scheme. When the temperature rises, the connecting rod expands in the length direction, changing the length dL. The temperature change of 40 degrees is obtained through simple geometric operation, and the specific L value of phi angle change needs to be generated, so that the relation between the incident angle and phi is deduced. By designing different L, the compensation or overcompensation for one period of the etalon described above can be achieved.
In the overcompensation scheme shown in FIG. 5b, the etalon has a peak wavelength λ of 20 to 40 degrees * Drift of 50pm, vs. uncompensated peak wavelength λ * Drift 180pm to compensate for peak wavelength λ of one period * The drift is 90pm, and the wavelength control precision is higher. I.e. overcompensation can improve etalon wavelength lambda stability over a range of temperatures.
The embodiment of the invention also provides a wavelength locking device. FIG. 6 is a schematic structural diagram of a wavelength locker according to an embodiment of the present invention; as shown in fig. 6, the apparatus includes: the tunable laser 101, the first optical splitter 111, the second optical splitter 106, the second photoelectric converter 108, and the etalon package structure according to the foregoing embodiment of the present invention; wherein, the first and the second end of the pipe are connected with each other,
the first optical splitter 111 is disposed on an optical path of the emergent light of the tunable laser 101, and is configured to split the emergent light into a second optical signal and a third optical signal; the second optical signal is vertical to the optical path of the emergent light, and the third optical signal is horizontal to the optical path of the emergent light;
the second optical splitter 106 is disposed on an optical path of the second optical signal, and is configured to split the second optical signal into a fourth optical signal and a fifth optical signal; the fourth optical signal is horizontal to the optical path of the emergent light, and the fifth optical signal is vertical to the optical path of the emergent light;
the second photoelectric converter 108 is disposed on an optical path of the fifth optical signal, and is configured to receive the fifth optical signal and convert the fifth optical signal into a second electrical signal;
the etalon 110 of the etalon packaging structure is disposed on the optical path of the fourth optical signal.
Based on the description of the foregoing embodiments, the etalon packaging structure further includes a connecting rod 112 and a screw 107; the screws 107 are inserted through the through holes of the first substrate and fixed in the screw holes of the second substrate. The detailed description of the etalon packaging structure in this embodiment can refer to the foregoing embodiments, and is not repeated here.
In this embodiment, the tunable laser 101 is located on the heat sink 102, a gold-plated circuit is disposed on the heat sink 102, and an electrode of the tunable laser 101 is connected to the gold-plated circuit through a gold wire; the function of the gold-plated circuit is to energize the tunable laser 101.
In this embodiment, the first beam splitter 111 and the second beam splitter 106 may be implemented by beam splitting prisms. The first optical splitter 111 and the second optical splitter are respectively provided with 45-degree inclined planes, and the inclined planes are plated with splitting films for reflecting partial light beams; wherein, the partial light beam (second optical signal) reflected by the first optical splitter 111 is transmitted to the second optical splitter 106; the partial light beam (fifth optical signal) split by the second optical splitter 106 is transmitted to the second photoelectric converter 108; part of the light beam (fourth optical signal) reflected by the second optical splitter 106 is transmitted to the etalon in the etalon package structure, and is transmitted to the first photoelectric converter 109 after being processed by the etalon.
In an optional embodiment of the present invention, the apparatus further comprises an isolator 105, and the isolator 105 is disposed on an optical path between the tunable laser 101 and the first beam splitter 111, and is configured to block a light beam opposite to the outgoing light of the tunable laser 101.
In this embodiment, as an implementation manner, the isolator 105 may be formed by gluing two polarizers and faraday crystals, and a magnetic ring is disposed outside. A half-wave plate can be glued behind the second polarizer of the isolator 105 according to the design requirement of the polarization state of the optical path. The isolator 105 acts as a unidirectional transmission for the optical path, preventing the back reflected light from the optical path from entering the tunable laser 101 and affecting the operation of the laser. The isolator 105 is coated with an anti-reflection coating to reduce light reflection.
In an optional embodiment of the present invention, the apparatus further includes a collimating lens 104, and the collimating lens 104 is disposed on an optical path between the tunable laser 101 and the isolator 105, and is configured to collimate the outgoing light of the tunable laser 101.
In this embodiment, the collimating lens may be located in the first V-groove; and the collimating module is arranged behind the output section of the tunable laser 101 and is used for collimating the light emitted by the tunable laser 101.
In an alternative embodiment of the invention, the apparatus further comprises a converging lens 115 and a waveguide/fiber optic device 116; a converging lens 115 and a waveguide/fiber device 116 are disposed on the optical path of the third optical signal; wherein the content of the first and second substances,
the converging lens 115 is configured to perform converging processing on the third optical signal, and the converged optical signal enters the waveguide/optical fiber device 116.
In this embodiment, the current obtained by the second photoelectric converter through photoelectric conversion is P1, and P1 is a fixed value and does not change with the wavelength of the tunable laser; the current obtained by the first photoelectric converter through photoelectric conversion is P2, and since the light is processed by the etalon, P2 varies with the wavelength of the tunable laser. When the laser wavelength is stable, P2/P1 ≠ D, which is a certain value, when the laser wavelength is changed, it results in P2/P1 ≠ D. At this time, the phase (phase) current of the laser is adjusted, so that the P2/P1 is satisfied again, namely, the wavelength locking of the laser is realized.
In this embodiment, The tunable laser may be a Digital Super-mode Distributed Bragg Reflector (DS-DBR) or a sampling grating Distributed Bragg Reflector (SG-DBR) based laser, and The wavelength in The period may be locked and adjusted by a method of changing a phase current in real time. The tunable laser in combination with the etalon can achieve wavelength locking or tuning. The standard has a corresponding FSR spectrogram, and the wave locking function of the laser can be realized by locking the wavelength points of the wave crests, the wave troughs or the wave waists of the spectrogram.
By adopting the technical scheme of the embodiment of the invention, the wavelength of the tunable laser can be locked by the etalon packaging structure without arranging a temperature control device.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed on a plurality of network units; some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above description is only an alternative embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present invention, and all such changes or substitutions are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An etalon packaging structure, comprising: the etalon is arranged on the fixing piece; one end of the temperature-sensing connecting piece is connected with the fixing piece; the other end of the temperature-sensitive connecting piece is fixed;
the size of the temperature-sensitive connecting piece changes along with the change of the environmental temperature;
under the condition that the size of the temperature-sensitive connecting piece changes, the fixing piece rotates around the fixed point to enable the etalon to rotate, and the rotation of the etalon is used for changing the reflection angle of the light beam in the etalon;
wherein the change in temperature and the change in the reflection angle of the beam within the etalon cause the peak transmission wavelength of the beam within the etalon to remain unchanged;
the temperature-sensitive connecting piece is a connecting rod; the connecting rod is made of a material with an expansion coefficient higher than a first preset threshold value;
the fixing piece comprises a first substrate, and the etalon packaging structure further comprises a fixed second substrate; the etalon is arranged on the first substrate; one end of the temperature-sensing connecting piece is connected with the first substrate, and the other end of the temperature-sensing connecting piece is connected with the second substrate;
the etalon packaging structure further comprises: a first photoelectric converter disposed on an exit light path of the etalon; the first photoelectric converter is disposed on the first substrate;
wherein, spring structures are arranged at two ends of the temperature-sensitive connecting piece; one end of the temperature-sensing connecting piece is connected with the first substrate through a spring structure, and the other end of the temperature-sensing connecting piece is connected with the second substrate through a spring structure.
2. The etalon packaging structure of claim 1, wherein a through hole is provided at a fixed point of the first substrate, and a threaded hole is provided in the second substrate, and a screw passing through the through hole is fixed in the threaded hole, so that the first substrate can rotate around the fixed point.
3. The etalon package structure of claim 1, wherein the first and second substrates are of a material having a coefficient of expansion below a second predetermined threshold.
4. The etalon package structure of claim 1, wherein the length of the connecting rod is related to a compensation period of a peak transmission wavelength of the etalon; the compensation period is determined based on a degree of temperature change of an environment in which the etalon is located.
5. The etalon package structure of claim 2, wherein a spacer is disposed between the screw and the first substrate.
6. The etalon package structure of any one of claims 1 to 5, wherein the first optical-to-electrical converter is configured to receive the first optical signal emitted from the etalon and convert the first optical signal into a first electrical signal.
7. A wavelength locker apparatus, comprising: a tunable laser, a first beam splitter, a second photoelectric converter, and an etalon packaging structure according to any one of claims 1 to 6; wherein the content of the first and second substances,
the first optical splitter is arranged on a light path of emergent light of the tunable laser and is used for splitting the emergent light into a second optical signal and a third optical signal; the second optical signal is vertical to the optical path of the emergent light, and the third optical signal is horizontal to the optical path of the emergent light;
the second optical splitter is arranged on an optical path of the second optical signal and is used for splitting the second optical signal into a fourth optical signal and a fifth optical signal; the fourth optical signal is horizontal to the optical path of the emergent light, and the fifth optical signal is vertical to the optical path of the emergent light;
the second photoelectric converter is arranged on an optical path of the fifth optical signal and used for receiving the fifth optical signal and converting the fifth optical signal into a second electrical signal;
and an etalon in the etalon packaging structure is arranged on a light path of the fourth optical signal.
8. The wavelength locker of claim 7 further comprising an isolator disposed in the optical path between the tunable laser and the first beam splitter for blocking a beam of light in a direction opposite to the output light of the tunable laser.
9. The wavelength locking device of claim 8, further comprising a collimating lens disposed on the optical path between the tunable laser and the isolator for collimating the emitted light from the tunable laser.
10. The wavelength locker of any one of claims 7 to 9, wherein the device further comprises a converging lens and a waveguide/fiber device; the converging lens and the waveguide/optical fiber device are arranged on the light path of the three optical signals; wherein the content of the first and second substances,
and the converging lens is used for converging the third optical signal, and the converged optical signal enters the waveguide/optical fiber device.
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