CN112731595A - 2X2 optical fiber coupler capable of adjusting splitting ratio - Google Patents
2X2 optical fiber coupler capable of adjusting splitting ratio Download PDFInfo
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- CN112731595A CN112731595A CN202011101584.3A CN202011101584A CN112731595A CN 112731595 A CN112731595 A CN 112731595A CN 202011101584 A CN202011101584 A CN 202011101584A CN 112731595 A CN112731595 A CN 112731595A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
- G02B6/2821—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using lateral coupling between contiguous fibres to split or combine optical signals
Abstract
The invention discloses a 2X2 optical fiber coupler capable of adjusting splitting ratio, which comprises an optical fiber coupling unit, a feedback control optical fiber, an analog phase adjusting unit, a drive control unit and a short-circuit optical fiber, wherein: the optical fiber coupling unit is internally provided with a feedback control optical fiber, two ends of the feedback control optical fiber are in short circuit through a short circuit optical fiber to form a closed loop, the feedback control optical fiber is connected with the analog phase adjusting unit through the short circuit optical fiber, and the drive control unit realizes the adjustment of the splitting ratio of the optical fiber coupling unit by continuously changing the phase of the analog phase adjusting unit.
Description
Technical Field
The invention belongs to the technical field of optical fiber devices, and particularly relates to a 2X2 optical fiber coupler capable of adjusting a splitting ratio.
Background
An optical fiber coupler (hereinafter, simply referred to as a coupler) is a basic device for splitting and combining optical paths, and is the most important basic element constituting various optical fiber networks or optical fiber loops. Because the connection ports of the Optical Network are all Optical fibers, the Optical Network is very convenient to connect and use in an Optical fiber Network, so that the Optical Network has very wide application, such as forming an Optical distribution Network in a Passive Optical Network (PON); the optical fiber interferometer can be used for forming various optical fiber interferometers, such as Mach-Zehnder, Michelson and Sagnac interferometers, can also be used for forming an optical fiber annular cavity, is commonly used in optical fiber lasers, optical fiber amplifiers and various optical instruments (such as OCT), and has important basic positions in optical fiber communication, optical fiber sensing and optical fiber instruments.
The principle of fiber couplers is based on the basic principle that two fibers close to each other will exchange energy. During the manufacturing process, the splitting ratio is determined, that is, once the coupler is manufactured, the splitting wave cannot be adjusted (although the splitting ratio changes with the change of the wavelength, the splitting ratio is an unstable factor), which causes inconvenience for the use of the coupler. For example, in an optical network, the insertion loss of a certain branch changes, but the splitting ratio of the coupler cannot change, so that the power of two paths of light cannot be balanced. For another example, in various measuring instruments, a coupler is often used to tap off a light path to monitor the power variation of the light source, and the monitoring optical path structure is very inflexible due to the fixed splitting ratio, and when the power variation of the laser is large, the detector may exceed its saturation value or be as low as below the threshold power, so that the power range to be monitored is very limited. Because the splitting ratio can not be adjusted, the optical network is very inflexible, the interferometer is also not easy to adjust, and the dynamic range of the optical instrument based on the optical fiber is limited.
At present, various optical networks are mature, optical fiber optical instruments are also in commercial use, in order to further improve the flexibility of the network and increase the dynamic range of the optical instruments, the demand for the coupler with the adjustable splitting ratio floats out of the water surface, the adjustment of the splitting ratio of the coupler needs to be on-line and in real time, namely, the coupler is connected into the optical network or an optical fiber loop, and the network service cannot be stopped because the splitting ratio of the coupler needs to be adjusted. Real-time performance means that the adjusting speed is high, and the adjusting time should reach the ms level or less, because the long adjusting time affects the normal operation of the network service. Besides, the adjustment of the split ratio should be continuously adjustable to meet the specific requirements of users for the split ratio.
Disclosure of Invention
The invention aims to provide a 2X2 optical fiber coupler capable of adjusting the splitting ratio, which aims to solve the problem that the splitting ratio of the existing coupler cannot be adjusted on line and in real time.
In order to achieve the purpose, the invention provides the following technical scheme: A2X 2 optical fiber coupler capable of adjusting splitting ratio comprises an optical fiber coupling unit, a feedback control optical fiber, an analog phase adjusting unit, a driving control unit and a short-circuit optical fiber, wherein:
a feedback control optical fiber is arranged in the optical fiber coupling unit, and two ends of the feedback control optical fiber are in short circuit through a short circuit optical fiber to form a closed loop;
the feedback control optical fiber is connected with the analog phase adjusting unit through the short-circuit optical fiber, and the drive control unit realizes the adjustment of the splitting ratio of the optical fiber coupling unit by continuously changing the phase of the analog phase adjusting unit.
Preferably, the optical fiber coupling unit includes an optical fiber a, an optical fiber b and a feedback control optical fiber, the optical fiber a and the optical fiber b are longitudinally parallel, and a fiber core of the feedback control optical fiber is located at a midpoint of a connecting line of a fiber core of the optical fiber a and a fiber core of the optical fiber b, and forms a line-shaped structure with symmetrical two sides.
Preferably, a fiber amplifier is inserted and connected in the feedback control fiber closed loop.
Preferably, the analog phase adjusting unit is a piezoelectric ceramic ring, and the short-circuit optical fiber is wound on the outer surface of the piezoelectric ceramic ring.
Preferably, the simulation phase adjusting unit is a piezoelectric ceramic plate, the piezoelectric ceramic plate is arranged in an up-down symmetrical manner, and the short-circuit optical fiber is arranged in the piezoelectric ceramic plate in the up-down symmetrical manner.
Preferably, the analog phase adjusting unit is a lithium niobate electro-optic phase modulator, and the lithium niobate electro-optic phase modulator is inserted and connected in the feedback control optical fiber closed loop.
Preferably, the analog phase adjusting unit is a semiconductor optical amplifier, and the semiconductor optical amplifier is inserted into the feedback control optical fiber closed loop.
Preferably, a wavelength division multiplexer is arranged at the input end of the semiconductor optical amplifier, and a wavelength division demultiplexer is arranged at the output end of the semiconductor optical amplifier;
the wavelength division multiplexer combines two lights with different wavelengths, and the wavelength division demultiplexer can divide the two lights with different wavelengths.
Preferably, the driving control unit is a power supply and a potentiometer.
Preferably, the driving control unit is a power supply and a constant current source generator.
Preferably, the drive control unit is a power supply and a tunable laser.
The technical effects and advantages of the invention are that the 2X2 fiber coupler with adjustable splitting ratio:
1. the optical splitting ratio can be adjusted in real time according to the insertion loss change condition in an optical network or an optical fiber application loop, so that the flexibility of the network is greatly improved, and the dynamic range of an optical instrument is also enlarged;
2. the adjusting speed is high, the adjusting time can reach ms level or less than ms, and the network service is not stopped due to the adjustment of the light splitting ratio;
3. the continuous adjustment function of the splitting ratio can be used for power control of an optical network or an optical fiber application loop, and specific requirements of users on the splitting ratio are met.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 shows the internal structure of the optical fiber coupling unit according to the present invention;
FIG. 3 is a schematic diagram of a port of an optical fiber coupling unit according to the present invention;
FIG. 4 is a system diagram of the present invention based on a piezoelectric ceramic ring as an analog phase adjustment unit;
FIG. 5 is a system diagram of the present invention based on a piezo-ceramic platen as an analog phase adjustment unit;
FIG. 6 is a system diagram of the present invention with a lithium niobate phase modulator as an analog phase adjustment unit;
fig. 7 is a system diagram of the present invention using a semiconductor optical amplifier as an analog phase adjusting unit.
In the figure: 1. an optical fiber coupling unit; 2. a feedback control optical fiber; 3. an analog phase adjusting unit; 4. a drive control unit; 5. short-circuit optical fibers; 11. an optical fiber a; 12. and an optical fiber b.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 7 in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a 2X2 optical fiber coupler capable of adjusting splitting ratio as shown in FIGS. 1-7, comprising an optical fiber coupling unit 1, a feedback control optical fiber 2, an analog phase adjusting unit 3 and a driving control unit 4, wherein:
the feedback control optical fiber 2 is arranged in the optical fiber coupling unit 1, two ends of the feedback control optical fiber 2 are in short circuit through the short circuit optical fiber 5 to form a closed loop, the feedback control optical fiber 2 is connected with the analog phase adjusting unit 3 through the short circuit optical fiber 5, and the drive control unit 4 realizes adjustment of the splitting ratio of the optical fiber coupling unit 1 by continuously changing the phase of the analog phase adjusting unit 3
Specifically, the optical fiber coupling unit 1 includes an optical fiber a11, an optical fiber b12, and a feedback control optical fiber 2, the optical fiber a11 and the optical fiber b12 are two optical fibers participating in coupling, the feedback control optical fiber 2 is an optical fiber inserted for realizing control of the split ratio, the feedback control optical fiber 2, the optical fiber a11, and the optical fiber b12 are longitudinally parallel, and the fiber core of the feedback control optical fiber 2 is located at the midpoint of a connection line of the fiber core of the optical fiber a11 and the fiber core of the optical fiber b12, and form a line-shaped structure with bilateral symmetry.
Specifically, an optical fiber amplifier is inserted and connected in the closed loop of the feedback control optical fiber 2, the total insertion loss of the optical fiber coupling unit 1 should be as close to 1 as possible, and the optical fiber amplifier can be inserted in the short-circuit optical fiber 5 to ensure that the total insertion loss of the closed loop of the feedback control optical fiber 2 is close to 1.
When the optical fiber coupling unit 1 is in an open-loop structure, that is, when the two ends of the feedback control optical fiber 2 are not short-circuited, the optical field relationship between the input port and the output port of the optical fiber coupling unit 1 can be described by a transmission matrix, that is, formula 1 is obtained,
in equation 1, the electric field intensity at the input port of the optical fiber a11 is E1The electric field intensity at the output port of the optical fiber a11 is E'3(ii) a The electric field intensity of the input port of the optical fiber b12 is E2The electric field intensity at the output port of the optical fiber b12 is E'4(ii) a The electric field intensity of the input port of the feedback control fiber 2 is E5E 'is the electric field intensity at the output port of the feedback control fiber 2'6，
Further, from the transmission matrix T in equation 1, equation 2 can be derived,
in formula 2, k is the coupling coefficient of the optical fiber coupling unit 1, L is the coupling region length of the optical fiber coupling unit 1, and γcIn order for the optical fiber coupling unit 1 to have an insertion loss,
furthermore, the coupling coefficient of the optical fiber coupling unit 1 and the length of the coupling area of the optical fiber coupling unit 1 are precisely adjusted, so that the coupling efficiency is improved
Thus, the transmission matrix T is simplified, and equation 3 can be derived,
thus, the optical field relationship between the input port and the output port of the fiber coupling unit 1 is simplified, and equation 4 can be obtained,
when both ends of the feedback control fiber 2 are short-circuited by the short-circuited fiber 5, both the light input from the input port of the fiber a11 and the light input from the input port of the fiber b12 can be output from the output port of the feedback control fiber 2, and the light output from the output port of the feedback control fiber 2 can be returned to the input port of the feedback control fiber 2, so that the formula 5 can be obtained according to the input of the input port of the feedback control fiber 2,
in the formula 5, γfFor short-circuited optical fibres 5, attenuation coefficient, LfIn order to short the length of the optical fibre 5,
the fiber coupler splitting ratio is defined as the ratio of the power of two output ports when input is from one port of the fiber coupler.
To determine the splitting ratio, we can input light from only one port, if we choose to input light from the input port of fiber a11, i.e. E1≠0，E20, corresponding to an input optical power of P0Substituting the condition into formula 4 in combination with formula 5 to obtain formula 6,
in the formula 6, the first and second groups,
then, the power at the output port of the optical fiber b12 and the output port of the feedback control optical fiber 2 are respectively,
the total insertion loss of the closed loop of the feedback control fiber 2 can be close to 1 by inserting the fiber amplifier on the short-circuit fiber 5, so that gamma is enabledfγcAs 1, it can be obtained that,
then, the splitting ratio between the two is,
in this case, only β L needs to be adjustedfI.e. the length of the short optical fiber 5, the splitting ratio can be adjusted.
Specifically, the simulation phase adjusting unit 3 is a piezoelectric ceramic ring, the short-circuit optical fiber 5 is wound on the outer surface of the piezoelectric ceramic ring, and the driving control unit 4 is used for adjusting the voltage applied to the piezoelectric ceramic ring, so that the length of the short-circuit optical fiber 5 is adjusted, and phase adjustment is realized.
Specifically, simulation phase place adjustment unit 3 is piezoceramics board, and piezoceramics board longitudinal symmetry sets up, and short circuit optic fibre 5 sets up in the piezoceramics board of longitudinal symmetry, utilizes drive control unit 4 to adjust the voltage of applying on piezoceramics board, changes the pressure of piezoceramics board, makes short circuit optic fibre 5 pressurized change its length to realize phase place adjustment.
Specifically, the analog phase adjusting unit 3 is a lithium niobate electro-optic phase modulator, the lithium niobate electro-optic phase modulator is inserted into a closed loop of the feedback control optical fiber 2, the lithium niobate electro-optic phase modulator is arranged on the short-circuit optical fiber 5, and the drive control unit 4 is used for adjusting the voltage applied to the lithium niobate phase modulator, so that the phase adjustment is realized.
Specifically, the analog phase adjusting unit 3 is a semiconductor optical amplifier, the semiconductor optical amplifier is inserted into a closed loop of the feedback control optical fiber 2, and the phase of the optical signal in the feedback control optical fiber 2 can be changed by adjusting the current injected into the semiconductor optical amplifier, so that the phase modulation of the feedback control optical signal is realized, and the current injected into the semiconductor optical amplifier is provided by the driving control unit 4.
Specifically, a wavelength division multiplexer is arranged at the input end of the semiconductor optical amplifier, a wavelength division demultiplexer is arranged at the output end of the semiconductor optical amplifier, the wavelength division multiplexer combines two lights with different wavelengths, the wavelength division demultiplexer decomposes the two lights with different wavelengths, and phase modulation of the feedback control optical signal is realized by using the cross phase modulation effect of the semiconductor optical amplifier.
Specifically, the drive control unit 4 is a power supply and a potentiometer, the power supply can supply power to the potentiometer, and drive control voltage to the piezoelectric ceramic ring or the piezoelectric ceramic plate or the phase modulator is obtained by adjusting the potentiometer, so that the length of the short-circuit optical fiber 5 is adjusted, and phase adjustment is realized.
Specifically, the driving control unit 4 is a power supply and a constant current source generator, the power supply can supply power to the constant current source generator, and the semiconductor optical amplifier obtains different phase shifts by adjusting the current of the constant current source generator, so that the phase modulation of the feedback control optical signal is realized.
Specifically, the drive control unit 4 includes a power supply and a tunable laser, the power supply can supply power to the tunable laser, and by adjusting the power of the tunable laser, the tunable laser generates another wavelength control light, the wavelength division multiplexer combines two lights with different wavelengths, and the wavelength division demultiplexer decomposes the two lights with different wavelengths, and by using the cross phase modulation effect of the semiconductor optical amplifier, the semiconductor optical amplifier obtains different phase shifts, and phase modulation of the feedback control optical signal is realized.
In the present invention, the driving control unit 4 is connected to the interface of the computer through the data acquisition card, and the voltage, current and wavelength applied to the phase modulation unit through the driving control unit 4 are automatically adjusted on the computer through software.
The first embodiment is as follows:
referring to fig. 1, 2 and 3, a feedback control fiber 2 is added to a fiber a11 and a fiber b12 participating in coupling in a fiber coupling unit 1, a closed loop is formed by short-circuiting both ends of the feedback control fiber 2, the phase shift of the feedback control fiber 2 is adjusted by an analog phase adjusting unit 3, the fiber core of the feedback control fiber 2 must be located at the midpoint of the connecting line of the two fiber cores participating in coupling, a symmetrical in-line structure is formed, and in the longitudinal direction, the feedback control fiber 2, the fiber a11 and the fiber b12 must be strictly parallel;
in this embodiment, simulation phase place regulating unit 3 adopts the piezoceramics ring, and drive control unit 4 adopts power and potentiometre, and feedback control optic fibre 2 links to each other with the piezoceramics ring through short circuit optic fibre 5, and short circuit optic fibre 5 twines in the piezoceramics ring surface, adjusts the voltage of exerting on piezoceramics board through the potentiometre, realizes adjusting short circuit optic fibre 5 length to realize phase adjustment, and then realize the phase modulation to feedback control optic fibre 2.
Example two:
referring to fig. 1, 2 and 4, a feedback control fiber 2 is added to a fiber a11 and a fiber b12 participating in coupling in a fiber coupling unit 1, a closed loop is formed by short-circuiting both ends of the feedback control fiber 2, the phase shift of the feedback control fiber 2 is adjusted by an analog phase adjusting unit 3, the fiber core of the feedback control fiber 2 must be located at the midpoint of the connection line of the two fibers participating in coupling, a symmetrical in-line structure is formed, and in the longitudinal direction, the feedback control fiber 2, the fiber a11 and the fiber b12 must be strictly parallel;
in this embodiment, simulation phase place adjustment unit 3 adopts piezoceramics board, and drive control unit 4 adopts power and potentiometre, feedback control optic fibre 2 links to each other with the piezoceramics ring through short circuit optic fibre 5, and short circuit optic fibre 5 sets up between the piezoceramics board of upper and lower both sides, adjust the voltage of applying on the piezoceramics board through the potentiometre, change piezoceramics board voltage, the realization is adjusted short circuit optic fibre 5 length, thereby realize the phase adjustment, and then realize the phase modulation to feedback control optic fibre 2.
Example three:
referring to fig. 1, 2 and 5, a feedback control fiber 2 is added to a fiber a11 and a fiber b12 participating in coupling in a fiber coupling unit 1, a closed loop is formed by short-circuiting both ends of the feedback control fiber 2, the phase shift of the feedback control fiber 2 is adjusted by an analog phase adjusting unit 3, the fiber core of the feedback control fiber 2 must be located at the midpoint of the connection line of the two fibers participating in coupling, a symmetrical in-line structure is formed, and in the longitudinal direction, the feedback control fiber 2, the fiber a11 and the fiber b12 must be strictly parallel;
in this embodiment, the analog phase adjusting unit 3 employs a lithium niobate phase modulator, and the driving control unit 4 employs a power supply and a potentiometer, so that the lithium niobate phase modulator is disposed in the closed loop of the feedback control optical fiber 2, and the potentiometer is used to adjust the voltage applied to the lithium niobate phase modulator, so as to change the phase of the optical signal in the feedback control optical fiber 2, thereby implementing the phase modulation of the feedback control optical signal.
Example four:
referring to fig. 1, 2 and 6, a feedback control fiber 2 is added to a fiber a11 and a fiber b12 participating in coupling in a fiber coupling unit 1, a closed loop is formed by short-circuiting both ends of the feedback control fiber 2, the phase shift of the feedback control fiber 2 is adjusted by an analog phase adjusting unit 3, the fiber core of the feedback control fiber 2 must be located at the midpoint of the connection line of the two fibers participating in coupling, a symmetrical in-line structure is formed, and in the longitudinal direction, the feedback control fiber 2, the fiber a11 and the fiber b12 must be strictly parallel;
in this embodiment, the analog phase adjusting unit 3 employs a semiconductor optical amplifier, the driving control unit 4 employs a power supply and a constant current source generator, the semiconductor optical amplifier is disposed in the short-circuited optical fiber 5, the semiconductor optical amplifier is disposed in the closed loop of the feedback control optical fiber 2, the constant current source generator is adjusted to adjust the injection current of the semiconductor optical amplifier, and the phase of the optical signal in the feedback control optical fiber 2 is changed, so as to implement phase modulation of the feedback control optical signal.
Example five:
referring to fig. 1, 2 and 6, a feedback control fiber 2 is added to a fiber a11 and a fiber b12 participating in coupling in a fiber coupling unit 1, a closed loop is formed by short-circuiting both ends of the feedback control fiber 2, the phase shift of the feedback control fiber 2 is adjusted by an analog phase adjusting unit 3, the fiber core of the feedback control fiber 2 must be located at the midpoint of the connection line of the two fibers participating in coupling, a symmetrical in-line structure is formed, and in the longitudinal direction, the feedback control fiber 2, the fiber a11 and the fiber b12 must be strictly parallel;
in this embodiment, the analog phase adjusting unit 3 employs a semiconductor optical amplifier, a wavelength division multiplexer and a wavelength division demultiplexer, the driving control unit 4 employs a power supply and a tunable laser, the semiconductor optical amplifier is disposed in the short-circuited optical fiber 5, the semiconductor optical amplifier is disposed in the closed loop of the feedback control optical fiber 2, the wavelength division multiplexer is disposed at the input end of the semiconductor optical amplifier, the wavelength division demultiplexer is disposed at the output end of the semiconductor optical amplifier, another wavelength light generated by the laser is adjusted, then injected through the input end of the wavelength division multiplexer, and then passes through the wavelength division multiplexer, to realize the combination of two lights with different wavelengths, the combined light realizes cross phase modulation in the semiconductor optical amplifier, the combined light passes through the wavelength division demultiplexer and is decomposed into two paths of wavelength light, the feedback control light returns to the optical fiber coupling unit 1 through the closed loop of the feedback control optical fiber 2, the other control light is output from the output of the wavelength division demultiplexer and dropped.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.
Claims (11)
1. The utility model provides an adjustable 2X2 fiber coupler of splitting ratio, includes fiber coupling unit (1), feedback control optic fibre (2), simulation phase place adjusting element (3), drive control unit (4) and short circuit fiber (5), its characterized in that:
a feedback control optical fiber (2) is arranged in the optical fiber coupling unit (1), and two ends of the feedback control optical fiber (2) are in short circuit through a short circuit optical fiber (5) to form a closed loop;
the feedback control optical fiber (2) is connected with the analog phase adjusting unit (3) through a short-circuit optical fiber (5), and the drive control unit (4) realizes adjustment of the splitting ratio of the optical fiber coupling unit (1) by continuously changing the phase of the analog phase adjusting unit (3).
2. The 2X2 fiber coupler according to claim 1, wherein: the optical fiber coupling unit (1) comprises an optical fiber a (11), an optical fiber b (12) and a feedback control optical fiber (2), the optical fiber a (11) and the optical fiber b (12) are longitudinally parallel, and the fiber core of the feedback control optical fiber (2) is positioned at the middle point of the connecting line of the fiber core of the optical fiber a (11) and the fiber core of the optical fiber b (12) and forms a line-shaped structure with symmetrical two sides.
3. The 2X2 fiber coupler according to claim 1, wherein: and an optical fiber amplifier is inserted and connected in the closed loop of the feedback control optical fiber (2).
4. The 2X2 fiber coupler according to claim 1, wherein: the analog phase adjusting unit (3) is a piezoelectric ceramic ring, and the short-circuit optical fiber (5) is wound on the outer surface of the piezoelectric ceramic ring.
5. The 2X2 fiber coupler according to claim 1, wherein: the simulation phase adjusting unit (3) is a piezoelectric ceramic plate, the piezoelectric ceramic plate is arranged in an up-down symmetrical mode, and the short-circuit optical fiber (5) is arranged in the piezoelectric ceramic plate in an up-down symmetrical mode.
6. The 2X2 fiber coupler according to claim 1, wherein: the analog phase adjusting unit (3) is a lithium niobate electro-optic phase modulator, and the lithium niobate electro-optic phase modulator is inserted and connected in the feedback control optical fiber (2) closed loop.
7. The 2X2 fiber coupler according to claim 1, wherein: the analog phase adjusting unit (3) is a semiconductor optical amplifier, and the semiconductor optical amplifier is inserted and connected into the closed loop of the feedback control optical fiber (2).
8. The 2X2 fiber coupler according to claim 7, wherein: the input end of the semiconductor optical amplifier is provided with a wavelength division multiplexer, and the output end of the semiconductor optical amplifier is provided with a wavelength division demultiplexer;
the wavelength division multiplexer combines two lights with different wavelengths, and the wavelength division demultiplexer can divide the two lights with different wavelengths.
9. The 2X2 fiber coupler according to claim 1, wherein: the drive control unit (4) is a power supply and a potentiometer.
10. The 2X2 fiber coupler according to claim 1, wherein: the drive control unit (4) is a power supply and a constant current source generator.
11. The 2X2 fiber coupler according to claim 1, wherein: the drive control unit (4) is a power supply and a tunable laser.
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| US4763977A (en) * | 1985-01-09 | 1988-08-16 | Canadian Patents And Development Limited-Societe | Optical fiber coupler with tunable coupling ratio and method of making |
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