CN115420271A - Optical fiber gyroscope light receiving and transmitting integrated module with relative intensity noise suppression - Google Patents
Optical fiber gyroscope light receiving and transmitting integrated module with relative intensity noise suppression Download PDFInfo
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- CN115420271A CN115420271A CN202210929790.6A CN202210929790A CN115420271A CN 115420271 A CN115420271 A CN 115420271A CN 202210929790 A CN202210929790 A CN 202210929790A CN 115420271 A CN115420271 A CN 115420271A
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- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C19/00—Gyroscopes; Turn-sensitive devices using vibrating masses; Turn-sensitive devices without moving masses; Measuring angular rate using gyroscopic effects
- G01C19/58—Turn-sensitive devices without moving masses
- G01C19/64—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams
- G01C19/72—Gyrometers using the Sagnac effect, i.e. rotation-induced shifts between counter-rotating electromagnetic beams with counter-rotating light beams in a passive ring, e.g. fibre laser gyrometers
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Abstract
The invention discloses a light receiving and transmitting integrated module with relative intensity noise suppression for a fiber-optic gyroscope, which comprises: the erbium-doped fiber laser comprises a pump source module, an erbium-doped fiber and a receiving module, wherein the pump source module is connected with the receiving module through the erbium-doped fiber; the waveguide type wavelength division multiplexer in the pump source module comprises three ports, wherein a first port on the left side is coupled with a pump source tube core of a laser in an axial coupling mode, a second port on the left side is connected with a first Faraday reflector, and a second port on the right side is connected with a first erbium-doped fiber terminal of an erbium-doped fiber; a second erbium-doped fiber terminal of an erbium-doped fiber in the receiving module is coupled with a polarization-maintaining filter isolator in a counter-shaft mode, the 50. The optical transceiving integrated module provides a reliable technical approach for integration and miniaturization of the high-precision fiber-optic gyroscope, reduces optical path loss and effectively improves the signal-to-noise ratio.
Description
Technical Field
The invention belongs to the technical field of optoelectronic devices, and relates to an optical transceiving integrated module with relative intensity noise suppression for a high-precision fiber-optic gyroscope, which is used for integration and coupling encapsulation among an ASE light source, a detector and a tail fiber under the condition that the ASE light source with the intensity noise suppression and the detector are integrated in the field of the high-precision fiber-optic gyroscope.
Background
The fiber optic gyroscope is an angular velocity sensor based on the Sagnac effect, and is widely applied to an inertial navigation system. With the continuous development of the field of inertial navigation, the requirement on angular velocity sensing precision is continuously improved. Because the transmission loss of the optical fiber at 1550nm is very small, the optical fiber is suitable for long-distance transmission or sensing, in a high-precision optical fiber gyroscope, an Amplified Spontaneous Emission (ASE) light source based on an erbium-doped optical fiber at 1550nm is generally used, and the optical fiber is a wide-spectrum light source with the advantages of high wavelength stability, large output power and the like, and is suitable for improving the zero-bias stability and scale factor stability of the gyroscope. However, the light Intensity fluctuation caused by the beat frequency of different frequency components in the wide-spectrum light source affects the output of the ASE light source, and the larger the optical power is, the more the output light Intensity fluctuation will increase, and generally, the ratio of the light Intensity fluctuation to the average optical power is defined as the Relative Intensity Noise (RIN) of the light source. In the signal detection process of the fiber optic gyroscope, when the optical power reaching the detector exceeds dozens of microwatts, the signal-to-noise ratio will not increase with the increase of the power of the light source, and RIN becomes the main noise limiting the detection accuracy, and for this reason, related RIN suppression methods have appeared. In the conventional intensity noise suppression ASE scheme, the device is too dispersed, and the whole light source module is too bulky, and the principle structure thereof is shown in fig. 2 (a). In addition, the presence of the pigtail and the melting point can cause additional error problems due to reliability and melting point reflections. For this reason, an efficient integration scheme is required to break the modules into whole.
In order to realize the integration of the optical transceiver module in the high-precision optical fiber gyroscope, reduce the volume size and design a feasible optical path scheme and structural layout of the optical transceiver module, which are key points for solving the problems, the invention provides an integration method of the optical fiber gyroscope relative intensity noise suppression ASE light source transceiver module, which is used for reducing the size and weight of the optical transceiver module in the high-precision optical fiber gyroscope and has far-reaching significance for the light and small size of the high-precision optical fiber gyroscope.
Disclosure of Invention
The invention aims to realize the integration of an intensity noise suppression ASE light source and a detector in a high-precision fiber-optic gyroscope, and provides an integration scheme based on a waveguide type Wavelength Division Multiplexer (WDM) and a waveguide coupler aiming at the integration scheme of the intensity noise suppression ASE light source and the detector. The invention adopts the following technical scheme:
an optical transceiver integrated module with relative intensity noise suppression for a fiber optic gyroscope, comprising: the device comprises a pump source module, an erbium-doped optical fiber and a receiving module, wherein the pump source module is connected with the receiving module through the erbium-doped optical fiber;
the pump source module comprises a laser pump source, a waveguide type wavelength division multiplexer and a first Faraday reflector, wherein the waveguide type wavelength division multiplexer comprises three ports, a first left port is coupled with a tube core of the laser pump source in a counter-shaft mode, a second left port is connected with the first Faraday reflector, and a second right port is connected with a first erbium-doped fiber terminal of an erbium-doped fiber;
the receiving module comprises a polarization-maintaining filter isolator, a 50 polarization-maintaining waveguide coupler, a second Faraday reflector, a detector and a tail fiber, wherein a second erbium-doped fiber terminal of the erbium-doped fiber is coupled with the polarization-maintaining filter isolator in a counter-shaft mode; the 50.
Further, the first Faraday reflector comprises a first Faraday rotator crystal, a total reflection filter film and a first tubular magnet; the second port on the left side of the waveguide type wavelength division multiplexer is connected with a first Faraday optical rotation crystal, and the end face of the first Faraday optical rotation crystal, which is opposite to the two connection end faces of the port on the left side, is plated with a total reflection filter film; the first Faraday rotator crystal is positioned inside the first tubular magnet and can rotate along the first tubular magnet;
the second Faraday reflector comprises a second Faraday rotator crystal, a 2% reflection filter film and a second tubular magnet; the second output port of the polarization-maintaining filter isolator is connected with a second Faraday rotator, and the end face of the second Faraday rotator, which is opposite to the two connection end faces of the output port, is plated with a 2% reflection filter film; the second Faraday rotator crystal is located inside the second tubular magnet and can rotate along the second tubular magnet.
Further, in the pump source module, the pump light is transmitted to the erbium-doped fiber through the waveguide type wavelength division multiplexer, the erbium-doped fiber generates spontaneous radiation under the action of the pump light, the radiation light of the erbium-doped fiber is transmitted along the forward direction and the backward direction, the backward radiation light is reversely transmitted and coupled to the first faraday reflector through the waveguide type wavelength division multiplexer, and returns to the erbium-doped fiber again after being reflected by the first faraday reflector, and is radiated and output through a second erbium-doped fiber terminal of the erbium-doped fiber.
Further, in the receiving module, forward radiation light of the erbium-doped fiber is coupled into a 50; the light coupled into the first output port is output through the tail fiber, namely the output light of the integrated module; the light at the second output port is converted into backward transmission light with the polarization state rotated by 90 ° by the second faraday mirror and reflected, and the backward transmission light is reversely transmitted and coupled to the second input port through the 50.
Further, the pump source module, the erbium-doped optical fiber and the receiving module are packaged in the same thin cylindrical structural member, the erbium-doped optical fiber is wound around a groove in the inner wall of the thin cylindrical structural member, and the tail fiber is led out from a side wall hole of the thin cylindrical structural member along the tangential direction.
Further, the tail fiber comprises a metalized fiber section, and the metalized fiber section is welded and sealed with the side wall hole of the thin cylindrical structural member; the position of the metalized fiber section in the pigtail is determined by the distance between the receiving module and the sidewall hole of the thin cylindrical structure.
The invention has the advantages and positive effects that:
(1) The invention relates to an optical transceiving integrated module with relative intensity noise suppression for a high-precision optical fiber gyroscope, which adopts a structural scheme with universality: the erbium-doped fiber is independent of the two integrated modules of the pump source module and the receiving module, so that the length of the erbium-doped fiber can be conveniently adjusted, and different lengths of the erbium-doped fiber can be designed according to different power and wavelength stability requirements; the pump module of the ASE light source, the intensity noise suppression structure and the detector module are integrated respectively, and a reliable technical approach is provided for the integration and miniaturization of the ASE light source module and the detector module of the high-precision fiber-optic gyroscope.
(2) The invention relates to an optical transceiver integrated module with relative intensity noise suppression for a high-precision optical fiber gyroscope, which adopts a waveguide WDM and a waveguide coupler to replace a fused tapered optical fiber device in the traditional split component scheme, realizes light splitting and coupling of light beams, greatly improves the integration level of the optical transceiver module, and simultaneously avoids polarization crosstalk or reflected secondary wave interference possibly existing in a tail fiber fusion point.
(3) The invention relates to a high-precision optical fiber gyroscope light transmitting-receiving integrated module with relative intensity noise suppression, which adopts waveguide type WDM to replace fused tapered WDM in a traditional ASE light source while paying attention to the integration degree of a light path, reduces 50% of light path loss and is beneficial to improving the signal-to-noise ratio of the high-precision optical gyroscope.
Drawings
Fig. 1 is a schematic configuration diagram of a fiber optic gyroscope. Wherein FIG. 1 (a) is a fiber optic gyroscope structure without intensity noise suppression; FIG. 1 (b) is a fiber optic gyroscope structure including intensity noise suppression; figure 1 (c) is an intensity noise suppressing fiber optic gyroscope scheme employing a faraday mirror.
Figure 2 is a diagram of the optical path structure of the intensity noise suppression ASE light source and receiving (detector) module. Fig. 2 (a) shows a conventional split component scheme in which components in an optical transceiver module are separated from each other and the components are connected to each other by pigtail fusion; FIG. 2 (b) is a schematic diagram of an optical path structure in which a pump source portion and an intensity noise suppressing and light receiving portion of an intensity noise suppression ASE light source transceiver module are integrated with each other; the integration of the pump source module 22 and the receiving module 23 is achieved by means of a facing axial coupling system.
Figure 3 is a three-dimensional schematic diagram of the integrated structure of the relative intensity noise suppression ASE light source transceiver module as designed. FIG. 3 (a) is a pump source module integrated structure; fig. 3 (b) is a receiving module integrated structure; the pump source module 22 and the receiver module 23 are connected by two terminals 41 and 42 of the erbium-doped fiber 4.
Figure 4 is a schematic diagram of the principle of the faraday rotation effect.
Fig. 5 is a schematic diagram of the integrated structure of the designed relative intensity noise suppression ASE light source transceiver module, and the openings on the side wall of the tube shell of the pigtail terminal 21 module realize the interaction with the external optical path.
Fig. 6 is a partially enlarged schematic view of the polarization maintaining pigtail terminal 21, which is obtained by fixing a polarization maintaining fiber in a silica U-shaped groove, cutting and grinding the end surface to make the end surface of the pigtail meet the requirement, and then axially coupling the polarization maintaining pigtail terminal 21 with the waveguide coupler 18; in order to hermetically seal the whole module, a section of the optical fiber behind the pigtail terminal needs to be metallized and then welded and sealed with the housing.
In the figure: 1-980 pump sources; 2-fused biconical mode WDM; 3-a Faraday filter mirror; 4-erbium doped fiber; 5-a filter isolator; 6-50; 7-99; 8-a detector; 9-99% port of coupler 7; 10-1% port of coupler 7; 11-12-pigtail terminals; 13-polarization maintaining tail fiber; 14-laser pumping source; 15-waveguide type WDM; 16-a first faraday mirror; 17-a filter isolator; 18-50; 19-a second faraday mirror; 20-a probe die; 21-polarization maintaining pigtail terminal; 22-a pump source module; 23-a receiving module; 24-U-shaped slots; 25-polarization maintaining fiber; 26-a metalized fiber section; 161-a first faraday rotator crystal; 162-total reflection filter membrane; 163-a first tubular magnet; 41-a first erbium doped fiber terminal; 42-a second erbium-doped fiber terminal; 191-a second faraday rotator; 192-2% reflective filter membrane; 193-a second tubular magnet; 271-light source heat sink; 272-277-accompany slices.
Detailed Description
The present invention will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic diagram of an optical fiber gyroscope, where fig. 1 (a) is a basic optical path structure of a conventional optical fiber gyroscope, and fig. 1 (b) is a conventional optical path structure of a high-precision optical fiber gyroscope with intensity noise suppression, and it can be seen from the diagram that there are many separate components in the conventional optical fiber gyroscope intensity noise suppression scheme, resulting in a large overall volume and many optical fiber pigtails and fusion points. Fig. 1 (c) shows a novel high-precision fiber-optic gyroscope structure with intensity noise suppression using faraday reflectors, and the present invention proposes an integration scheme for miniaturization and integration of the ASE light source with intensity noise suppression and the detector in the high-precision fiber-optic gyroscope structure.
Specifically, the invention reduces the volume and weight of an optical transceiver module consisting of an ASE light source, an intensity noise suppression light path and a detector, simultaneously cancels the method of connecting the traditional separation devices through the fusion of tail fibers, and reduces the nonlinear error introduced by the influence of environmental factors on the characteristics of the optical fibers and the error introduced by the back scattering existing in the melting point of the optical fibers. Fig. 2 (a) is a diagram showing an optical path structure of an ASE light source transceiver module with intensity noise suppression using a conventional splitting element, in which, in general, a 980 pump source 1 and an erbium-doped fiber 4 in an ASE light source are connected by a fused biconical type WDM 2, resulting from the dual-fiber fused biconical principle, in which 50% of theoretical optical energy is lost; secondly, in the conventional intensity noise suppression scheme, a 90-degree orthogonal fusion polarization-maintaining tail fiber is used as reference light input, and light intensity matching (99% of signal light and 1% of reference light) is realized with the signal light through a polarization-maintaining coupler 7 of 99. Fig. 2 (b) shows an integrated optical circuit structure of an optical transceiver module according to the present invention. The invention adopts the waveguide type WDM15 to replace the fused biconical taper type WDM 2 in the traditional ASE light source, and avoids 50 percent of light energy loss in the traditional scheme while facilitating the direct axial coupling with the laser pumping source 14 and the Faraday Reflector (FRM) 16. In addition, the designed FRM19 with 90-degree polarization rotation in the ASE light source transceiver module provides a reference light path for intensity noise suppression, the reflectivity of a reflecting film of the FRM19 is controlled to be about 2%, and then the FRM19 is coupled with a signal light path through the 50-degree polarization-preserving waveguide coupler 18, so that the same effect of the 99-degree polarization-preserving coupler 7 in the prior art is achieved, meanwhile, the 90-degree cross welding of the 99-degree polarization-preserving coupler 7 in the prior art and the polarization-preserving tail fiber of the 1-degree port 10 in the prior art is eliminated, the polarization orthogonal coupling between the tail fiber terminals 11 and 12 required in the prior art is avoided, and the manual operation difficulty is reduced.
Furthermore, the invention integrates the pump source module, the erbium-doped optical fiber and the receiving module into a whole optical transceiver module. The optical transceiver module integration scheme adopted by the invention is as follows: the pump source module and the receiving module of the enhanced noise suppression optical path are integrated respectively, the erbium-doped optical fiber is used as a pivot, and the two part integrated modules are connected in series and further integrated and packaged into a whole. The whole structure of the designed intensity noise suppression ASE optical transceiver module is disc-shaped, and the intensity noise suppression ASE optical transceiver module is convenient to match with a fiber-optic gyroscope system used for the product. The tail fiber of the designed integrated module needs to be metallized, and the metallization position of the optical fiber is determined by the distance between the receiving module and the side wall punching position of the integrated module.
The invention relates to an optical transceiving integrated module with relative intensity noise suppression for a fiber-optic gyroscope, which specifically comprises the following structural design:
the optical transceiver integrated module comprises three parts, namely a pump source module, an erbium-doped optical fiber and a receiving module. Wherein the pump source module comprises a 980nm Laser (LD) pump source, a waveguide Wavelength Division Multiplexer (WDM) and a first Faraday reflector; the receiving module comprises a polarization-maintaining filter isolator, a waveguide type polarization-maintaining coupler of 50 degrees, a second Faraday reflector for realizing 90-degree polarization rotation, a detector and a tail fiber; and the erbium-doped fiber is a connecting part between the pump source module and the receiving module. Since the ASE light source is based on the principle of amplification of spontaneous emission light of erbium-doped fiber, which is difficult to integrate into the integrated chip of the module, the ASE light source and the photodetector of the fiber-optic gyroscope are integrated into two large integrated modules, i.e., the pump source module and the receiving module shown in fig. 2 (b), which can be connected by using the jumper wire of the erbium-doped fiber.
The specific structural design analysis of the erbium-doped fiber ASE light source transceiver module with intensity noise suppression for the fiber-optic gyroscope is as follows:
(1) Integration scheme of pump source module:
the pump source module of the designed integration scheme includes a laser pump source 14, a waveguide type wavelength division multiplexer 15 and a first faraday mirror 16 in the conventional ASE light source scheme, as shown in fig. 3 (a). The specific implementation mode is as follows: a980 nm laser is used as a pumping light source, and a waveguide type 980/1550nm WDM15 is adopted, and comprises three effective ports: the port on the left side of the WDM15 was directly coupled axially towards the 980nm pump source die and fixedly bonded by means of a matching glue. The second port on the left side of the WDM15 is connected with a first Faraday rotator 161, and the end surface opposite to the end surface where the first Faraday rotator 161 is connected with the WDM15 is plated with a total reflection filter film 162 with 1550nm waveband; the first tubular magnet 163 is mated with a first faraday rotator 161. The first faraday rotator 161 is located inside the first tubular magnet 163 in a uniform magnetic field provided by the magnet. The port at the right side of the WDM15 is connected with a window which can be connected with an erbium-doped fiber jumper, and is fixed with the first erbium-doped fiber terminal 41 through matching glue.
Specifically, the pump light is transmitted to the erbium-doped fiber 4 through the WDM15, the erbium-doped fiber generates spontaneous radiation under the action of the pump light, the radiation light of the erbium-doped fiber is transmitted in forward and reverse directions, the radiation light of the erbium-doped fiber is reversely transmitted and coupled to the first faraday reflector 16 through the WDM15, and returns to the erbium-doped fiber again after being reflected, and is radiated and output through the first erbium-doped fiber terminal 41 of the erbium-doped fiber 4.
In particular, the faraday rotation crystal can rotate along the tubular magnet, thereby rotating the polarization direction of the light beam by using the magneto-optical effect. The influence of the Faraday optical rotation crystal on the conversion of the polarization state of the light beam is determined by the Faraday magnetic optical rotation effect, and the polarization state of the reflected light beam of the Faraday reflector can be changed and kept stable by selecting the material and the structure of the optical rotation crystal and the magnetic induction intensity B. As shown in FIG. 4, when the magnetic field is not particularly strong, the rotation angle θ of the polarization plane by the Faraday rotation effect F Distance from the propagation of light along a mediumL, the Verdet constant V of the medium, and the magnetic induction B of the magnetic field are in direct proportion:
θ F ＝VBL
(2) Integration scheme of the receiving module:
the receiving module of the designed integration scheme comprises a polarization-maintaining waveguide coupler 18 and a detector with polarization-maintaining filter isolators 17 and 50 in the conventional intensity noise suppression fiber optic gyroscope scheme, and adopts a 2% reflection filter film 192 and a second Faraday rotator 191 with polarization rotated by 90 degrees to realize the functions of a polarization-maintaining coupler of 99. The second erbium-doped fiber terminal 42 is directly coupled with the polarization-maintaining filter isolator 17 in a shaft-facing manner; the other end of the polarization-maintaining filter isolator 17 is connected with the input port I of the 50. The forward radiation light of the erbium-doped fiber is coupled into a coupler 18 through a polarization-maintaining filter isolator 17, and is coupled into a tail fiber through a first output port and transmitted to a second Faraday mirror 19 through a second output port. Light coupled into the first output port is output through the tail fiber, namely output light of the module; the light at the second output port is converted into backward transmission light with the polarization state rotated by 90 ° by rotating and reflecting the polarization state by the second faraday mirror 19, and is reversely transmitted and coupled to the second input port again by the coupler 18, like the external return light reversely input via the pigtail, and is detected by the detector 20. Wherein the part of the return beam coupled to the first input port is lost by the filter isolator 17 and is not transmitted to the erbium-doped fiber or even the pump source module.
The optical elements in the integrated module are partially controlled by the base accompanying sheet (light source heat sink 271 and accompanying sheets 272-277 in the figure) to ensure that the optical paths are coaxial, and the optical elements are fixed on the ceramic substrate.
(3) The integral integration method of the relative intensity noise suppression ASE light source transceiver module comprises the following structural design:
the pump source module 22, the receiving module 23 and the erbium-doped fiber 4 between the two modules are arranged in the same integrated unit, and the erbium-doped fiber is surrounded in a designed groove along the inner wall of the structural part; the pump source and the circuit of the refrigerator and the circuit part of the detector are realized on a circular circuit board matched with the bottom of the module shell. The overall structure is shown in fig. 5.
From the structural design angle, the overall size of the relative intensity noise suppression ASE light source transceiving integrated module is limited by the sizes of the pump source module and the receiving module on the one hand; and on the other hand by the bend radius that the erbium fiber can tolerate and the length of the erbium fiber.
The invention designs the relative intensity noise suppression ASE light source transceiving integrated module into a thin cylinder, and leads the tail fiber out from the side wall hole of the cylinder along the tangential direction, thereby avoiding the bending distance required by the coiling fiber under the condition that the tail fiber is led out along the diameter direction, and being beneficial to reducing the structural size of the system.
In addition, fig. 6 is a partially enlarged schematic view of the polarization maintaining pigtail terminal 21, the polarization maintaining fiber 25 is fixed in the silica U-shaped groove 24, the end surface is cut and ground to make the end surface of the pigtail meet the requirement, and then the polarization maintaining pigtail terminal 21 is coupled with the waveguide coupler 18 toward the axis; in order to hermetically seal the whole module, a section of optical fiber behind the pigtail terminal needs to be metallized, that is, the metallized optical fiber section 26 is welded and sealed with the cylindrical sidewall hole, so as to implement hermetic sealing of the integrated module.
The invention expounds an integration scheme of the intensity noise suppression ASE light source of the high-precision fiber-optic gyroscope and the optical transceiver module of the detector from the aspect of optical path design, can reduce optical path errors while improving the integration level of the optical transceiver module of the high-precision fiber-optic gyroscope, and provides an effective and feasible scheme for the integration and light and small development of the high-precision fiber-optic gyroscope.
Claims (6)
1. An optical transceiver integrated module with relative intensity noise suppression for a fiber optic gyroscope, comprising: the erbium-doped fiber laser comprises a pump source module, an erbium-doped fiber and a receiving module, wherein the pump source module is connected with the receiving module through the erbium-doped fiber;
the pump source module comprises a laser pump source, a waveguide type wavelength division multiplexer and a first Faraday reflector, wherein the waveguide type wavelength division multiplexer comprises three ports, a first left port is coupled with a tube core of the laser pump source in a counter-shaft mode, a second left port is connected with the first Faraday reflector, and a second right port is connected with a first erbium-doped fiber terminal of an erbium-doped fiber;
the receiving module comprises a polarization-maintaining filter isolator, a 50 polarization-maintaining waveguide coupler, a second Faraday reflector, a detector and a tail fiber, wherein a second erbium-doped fiber terminal of the erbium-doped fiber is coupled with the polarization-maintaining filter isolator in a counter-shaft mode; the 50.
2. The optical transceiver integrated module of claim 1, wherein the first faraday reflector comprises a first faraday rotator, a total reflection filter film, a first tubular magnet; the second port on the left side of the waveguide type wavelength division multiplexer is connected with a first Faraday optical rotation crystal, and the end face of the first Faraday optical rotation crystal, which is opposite to the two connection end faces of the port on the left side, is plated with a total reflection filter film; the first Faraday rotator crystal is positioned inside the first tubular magnet and can rotate along the first tubular magnet;
the second Faraday reflector comprises a second Faraday rotator crystal, a 2% reflection filter film and a second tubular magnet; the second output port of the polarization-maintaining filter isolator is connected with a second Faraday rotator, and the end face of the second Faraday rotator, which is opposite to the two connection end faces of the output port, is plated with a 2% reflection filter film; the second Faraday rotator is located inside the second tubular magnet and can rotate along the second tubular magnet.
3. The optical transceiver module as claimed in claim 2, wherein in the pump source module, the pump light is transmitted to the erbium-doped fiber through a waveguide wavelength division multiplexer, the erbium-doped fiber generates spontaneous radiation under the action of the pump light, and the radiation light of the erbium-doped fiber is transmitted in forward and backward directions, wherein the backward radiation light is backward transmitted and coupled to the first faraday mirror through the waveguide wavelength division multiplexer, is reflected by the first faraday mirror, returns to the erbium-doped fiber again, and is radiated and output through the second erbium-doped fiber terminal of the erbium-doped fiber.
4. The optical transceiver integrated module as claimed in claim 3, wherein in the receiving module, forward radiation light from the erbium-doped fiber is coupled into a 50; the light coupled into the first output port is output through the tail fiber, namely the output light of the integrated module; the light at the second output port is converted into backward transmission light with the polarization state rotated by 90 ° by the second faraday mirror and reflected, and the backward transmission light is reversely transmitted and coupled to the second input port through the 50.
5. The integrated optical transceiver module as claimed in any one of claims 1 to 4, wherein the pump source module, the erbium-doped fiber and the receiving module are packaged in the same thin cylindrical structure, the erbium-doped fiber is wound around a groove on the inner wall of the thin cylindrical structure, and a tail fiber is led out from the side wall hole of the thin cylindrical structure in a tangential direction.
6. The optical transceiver integrated module of claim 5, wherein the pigtail comprises a metalized fiber section that is sealed to the sidewall hole of the thin cylindrical structure; the position of the metalized fiber section in the pigtail is determined by the distance between the receiving module and the sidewall hole of the thin cylindrical structure.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116086496A (en) * | 2023-03-31 | 2023-05-09 | 中国船舶集团有限公司第七〇七研究所 | Method and system for improving sensitivity of integrated fiber optic gyroscope |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116086496A (en) * | 2023-03-31 | 2023-05-09 | 中国船舶集团有限公司第七〇七研究所 | Method and system for improving sensitivity of integrated fiber optic gyroscope |
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