CN204575907U - A kind of forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) - Google Patents

Abstract

The utility model discloses a kind of forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA), forward direction optoelectric hybrid device is connected by Er-doped fiber with the backward optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA), this forward direction optoelectric hybrid device comprises the optical splitter set gradually, isolator and wavelength division multiplexer, the top of optical splitter is provided with photoelectric commutator, it is two parts that optical splitter is used for light signal light splitting, photoelectric commutator is used for a part of light signal to be converted to electric signal, electric signal is used for monitoring, isolator is used for the isolation of luminous power, wavelength division multiplexer is used for by the light signal of different wave length separately.The utility model realize the monitoring of luminous power, isolation, wavelength-division multiplex and light splitting four kinds of functions height integrated so that forward direction optoelectric hybrid device volume reduces.

Description

A forward optoelectronic hybrid device for Erbium-doped fiber amplifier

technical field

The utility model relates to an erbium-doped optical fiber amplifier, in particular to a forward photoelectric hybrid device of the erbium-doped optical fiber amplifier.

Background technique

In the current optical fiber communication system, Erbium-doped Optical Fiber Amplifier (EDFA for short) is a key component for long-distance communication. It is widely used in long-distance optical fiber communication, high-speed communication and fiber access to cable TV (Community AntennaTelevision, referred to as: CATV) and other fields.

As shown in FIG. 1 , the structure diagram of an existing forward photoelectric hybrid device of an erbium-doped fiber amplifier. The forward photoelectric hybrid device and the backward photoelectric hybrid device are connected 17 through an erbium-doped optical fiber, and include an optical splitter 18, an isolator 19 and a wavelength division multiplexer 20 connected in sequence, and the optical splitter 18 is connected with a photoelectric converter 21, and the wavelength division The multiplexer 20 is connected to a pump laser 22 . An optical signal source 23 is input from one end of the optical splitter 18 .

Therefore, the existing forward optoelectronic hybrid devices do not integrate the four components of optical splitter, isolator, wavelength division multiplexer and photoelectric converter, and cannot simultaneously obtain optical splitting, monitoring, isolation and wavelength division multiplexing of output optical power. Use four functions.

Utility model content

The main purpose of the utility model is to provide a forward photoelectric hybrid device of an erbium-doped optical fiber amplifier, so that the integration degree of the forward photoelectric hybrid device is improved, the volume is reduced, and the cost is reduced.

A forward photoelectric hybrid device of an erbium-doped fiber amplifier, the forward photoelectric hybrid device and the backward photoelectric hybrid device of the erbium-doped fiber amplifier are connected through an erbium-doped optical fiber, and the forward photoelectric hybrid device includes an optical splitter and an isolator arranged in sequence And wavelength division multiplexer, the upper part of the optical splitter is equipped with a photoelectric converter, the optical splitter is used to split the optical signal into two parts, the photoelectric converter is used to convert a part of the optical signal into an electrical signal, the electrical signal is used for monitoring, and the isolator is used for For isolation of optical power, wavelength division multiplexers are used to separate optical signals of different wavelengths.

Preferably, a first collimator is arranged before the beam splitter, and a second collimator is arranged behind the isolator.

Preferably, the first collimator is a single fiber collimator.

Preferably, the single fiber collimator includes a first glass tube, a first lens, a first capillary, and a first optical fiber, the first lens is arranged opposite to the first capillary, the first capillary is arranged in the first glass tube, and the first optical fiber is arranged in the first capillary.

Preferably, the second collimator is a double fiber collimator.

Preferably, the double fiber collimator includes a second glass tube, a second lens, a second capillary, a first optical fiber and a second optical fiber, the second capillary is arranged in the second glass tube opposite to the second lens, the first optical fiber and the second The two optical fibers are arranged in parallel in the second capillary, and the second lens is connected with the wavelength division multiplexer.

Preferably, the wavelength division multiplexer is a 1550/980nm or 1550/1480nm optical filter.

Preferably, the isolator includes a magnetic ring, and three superimposed lens groups are arranged in the magnetic ring. The three superimposed lens groups are formed by stacking two polarizers and one Faraday rotator, and the Faraday rotator is arranged on the two polarizers. between positives.

Preferably, the beam splitter includes a 45° beveled glass tube and a 45° beam splitter, the 45° beam splitter is arranged at the end of one end of the 45° beveled glass tube, and the other end of the 45° beveled glass tube is connected to the first lens .

Preferably, the 45° beam splitter includes a beam splitter film and an anti-reflection film, and the anti-reflection film is arranged on the upper surface of the beam splitter film.

Due to the high integration of the utility model, the optical loss and the times of optical fiber welding between different devices are reduced. At the same time, due to the high integration of the utility model, the volume of the forward optoelectronic hybrid device is reduced, therefore, the production materials of the forward optoelectronic hybrid device are reduced, thereby reducing the production cost. The sleeve pipes of the utility model are all made of glass tubes, and various parts can be bonded by an all-glue process, so the production efficiency is high.

Description of drawings

Fig. 1 is a structural diagram of a forward optoelectronic hybrid device of an erbium-doped fiber amplifier in the prior art.

Fig. 2 is a structural schematic diagram of an embodiment of the forward photoelectric hybrid device of the erbium-doped fiber amplifier of the present invention, the forward photoelectric hybrid device includes a single-fiber pigtail, a double-fiber pigtail, an isolator and a beam splitter.

FIG. 3 is a schematic structural diagram of the single optical fiber pigtail shown in FIG. 2 .

FIG. 4 is a schematic structural diagram of the dual optical fiber pigtail shown in FIG. 2 .

FIG. 5 is a schematic structural diagram of the isolator shown in FIG. 2 .

FIG. 6 is a schematic structural diagram of the spectroscopic sheet shown in FIG. 2 .

Detailed ways

In order to make the purpose, technical solutions and advantages of the utility model clearer, the following will further describe the implementation of the utility model in detail in conjunction with the accompanying drawings.

As shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5 and Fig. 6, Fig. 2 is a structural diagram of a forward photoelectric hybrid device of an embodiment of an erbium-doped fiber amplifier, and Fig. 3 is a kind of embodiment of a single optical fiber pigtail Fig. 4 is a schematic structural view of a double-fiber pigtail in an embodiment, Fig. 5 is a schematic structural view of an isolator in an embodiment, and Fig. 6 is a schematic structural view of a light splitter in an embodiment. The forward photoelectric hybrid device of the erbium-doped fiber amplifier is connected with the backward photoelectric hybrid device of the erbium-doped fiber amplifier through an erbium-doped optical fiber. 10, the upper part of the optical splitter 5 is provided with a photoelectric converter 12, the optical splitter 5 is used to split the optical signal into two parts, the photoelectric converter 12 is used to convert a part of the optical signal into an electrical signal, and the electrical signal is used for monitoring and isolation The device 11 is used to isolate the optical power, and the wavelength division multiplexer 10 is used to separate the optical signals of different wavelengths. A first collimator is arranged in front of the beam splitter 5, and a second collimator is arranged behind the isolator 11. The first collimator is a single fiber collimator. The single fiber collimator includes a first glass tube 1 , a first lens 15 and a single fiber pigtail 16 .

The single optical fiber pigtail 16 includes a first capillary 17 and a first optical fiber 18, the first lens 15 is arranged opposite to the first capillary 17, the first capillary 17 is arranged in the first glass tube 1, and the first optical fiber 18 is arranged in the first Inside the capillary 17.

The second collimator is a double fiber collimator. The double fiber collimator includes a second glass tube 7 , a second lens 9 and a double fiber pigtail 8 .

The double optical fiber pigtail 8 comprises a second capillary 20, a first optical fiber 19 and a second optical fiber 21, the second capillary 20 is arranged in the second glass tube 7 opposite to the second lens 9, the first optical fiber 19 and the second optical fiber 21 Arranged in parallel in the second capillary 20 , the second lens 9 is connected with the wavelength division multiplexer 10 .

The wavelength division multiplexer 10 is a 1550/980nm or 1550/1480nm optical filter.

The isolator 11 includes a magnetic ring 22. Three superimposed lens groups are arranged in the magnetic ring 22. The three superimposed lens groups are formed by stacking two polarizers 23 and one Faraday rotator 24, and the Faraday rotator 24 is arranged on Between 2 polarizers 23.

The beam splitter 5 comprises a 45° bevel glass tube 13 and a 45° beam splitter, the 45° beam splitter is arranged on the end of one end of the 45° bevel glass tube 13, and the other end of the 45° bevel glass tube 13 is connected to the first lens 15 connections. The 45° beam splitting plate includes a beam splitting film 25 and an anti-reflection film 26 , and the anti-reflection film 26 is arranged on the upper surface of the beam splitting film 25 .

Due to the high integration of the utility model, the optical loss and the times of optical fiber welding between different devices are reduced. At the same time, due to the high integration of the utility model, the volume of the forward optoelectronic hybrid device is reduced, therefore, the production materials of the forward optoelectronic hybrid device are reduced, thereby reducing the production cost. The sleeve pipes of the utility model are all made of glass tubes, and various parts can be bonded by an all-glue process, so the production efficiency is high.

The working principle of the utility model is illustrated in conjunction with Fig. 2:

(1), the optical signal of 1550nm wave band is input from the first optical fiber 18, after being collimated by the first lens 15, transmits to the beam splitter 5, and a part of the optical signal (for example: 98% transmission) transmits to the isolator 11, and a part of the optical signal (for example: 2% reflection) is transmitted to the photoelectric converter 12 to be converted into an electrical signal, and the electrical signal is used for monitoring.

(2) After the optical signal transmitted to the isolator 11 is isolated by the isolator 11, the forward transmission of the optical signal is caused, and the reverse transmission is blocked, thereby ensuring the irreversibility of the optical path and reducing the interference of the returned signal.

(3) the isolated optical signal by the isolator 11 is transmitted to the wavelength division multiplexer 10, after the wavelength division multiplexer 10 is multiplexed, it is collimated by the second lens 9, and is transmitted to the first optical fiber 19, output through the first optical fiber 19.

(4) The pump signal 1480nm or 980nm sent by the pump laser is input through the second optical fiber 21, and after being collimated by the second lens 9, it is transmitted to the wavelength division multiplexer 10, and the wavelength division multiplexer 10 wavelength division multiplexer After use, it is transmitted to the first optical fiber 19.

The specific implementations of the utility model have been described in detail above, but they are only examples, and the utility model is not limited to the specific implementations described above. For those skilled in the art, any equivalent modifications or substitutions to the utility model are also within the scope of the utility model, therefore, equivalent transformations and substitutions made without departing from the spirit and principle scope of the utility model Modifications, improvements, etc., should all be covered within the scope of the present utility model.

Claims (10)

1. the forward direction optoelectric hybrid device of an Erbium-Doped Fiber Amplifier (EDFA), described forward direction optoelectric hybrid device is connected by Er-doped fiber with the backward optoelectric hybrid device of described Erbium-Doped Fiber Amplifier (EDFA), it is characterized in that, this forward direction optoelectric hybrid device comprises the optical splitter set gradually, isolator and wavelength division multiplexer, the top of described optical splitter is provided with photoelectric commutator, it is two parts that described optical splitter is used for light signal light splitting, described photoelectric commutator is used for a part of light signal to be converted to electric signal, described electric signal is used for monitoring, described isolator is used for the isolation of luminous power, described wavelength division multiplexer is used for by the light signal of different wave length separately.

2. the forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) according to claim 1, is characterized in that, is provided with first collimator before described optical splitter, is provided with the second collimating apparatus after described isolator.

3. the forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) according to claim 2, is characterized in that, described first collimator is single optical fiber calibrator.

4. the forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) according to claim 3, it is characterized in that, described single optical fiber calibrator comprises the first glass tube, the first lens, the first kapillary, the first optical fiber, described first lens and described first kapillary are oppositely arranged, described first kapillary is arranged in described first glass tube, and described first optical fiber is arranged in described first kapillary.

5. the forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) according to claim 1, is characterized in that, described second collimating apparatus is double-fiber collimator.

6. the forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) according to claim 5, it is characterized in that, described double-fiber collimator comprises the second glass tube, the second lens, the second kapillary, the first optical fiber and the second optical fiber, described second kapillary and described second lens are relatively arranged in described second glass tube, described first optical fiber and described second optical fiber are set in parallel in described second kapillary, and described second lens are connected with described wavelength division multiplexer.

7. the forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) according to claim 1, is characterized in that, described wavelength division multiplexer is 1550/980nm or 1550/1480nm optical filter.

8. the forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) according to claim 1, it is characterized in that, described isolator comprises magnet ring, three sheet superposed type lens set are set in described magnet ring, described three sheet superposed type lens set are formed by stacking by 2 polaroid and 1 Faraday rotation sheet, and described Faraday rotation sheet is arranged between 2 described polaroid.

9. the forward direction optoelectric hybrid device of the Erbium-Doped Fiber Amplifier (EDFA) according to claim 1 or 4, it is characterized in that, described optical splitter comprises 45 ° of oblique angle glass tubes and 45 ° of light splitting pieces, described 45 ° of light splitting pieces are arranged on the end of one end of described 45 ° of oblique angle glass tubes, and the other end of described 45 ° of oblique angle glass tubes is connected with described first lens.

10. the forward direction optoelectric hybrid device of Erbium-Doped Fiber Amplifier (EDFA) according to claim 1, is characterized in that, described 45 ° of light splitting pieces comprise spectro-film and anti-reflection film, and described anti-reflection film is arranged at the upper surface of described spectro-film.