Ultra-compact erbium-doped optical fiber amplifier

Abstract

The utility model relates to an ultra-compact erbium-doped optical fiber amplifier which comprises a pump laser, a composite isolation-wavelength division multiplexer integrated with erbium-doped optical fibers and an isolator integrated with erbium-doped optical fibers. The common end of the composite isolation-wavelength division multiplexer and the input end of the isolator share the same erbium-doped optical fiber; the pumping end of the composite isolation-wavelength division multiplexer is connected with the pumping laser and is used for introducing pumping light generated by the pumping laser into the erbium-doped optical fiber; the signal end is used for introducing signal light into the erbium-doped optical fiber; the common end is used for outputting, and an optical fiber of the common end is an erbium-doped optical fiber; the optical fiber at the input end of the isolator is an erbium-doped optical fiber, and the output end of the isolator is used for outputting the amplified signal light. One end of each optical device integrated with the erbium-doped optical fiber shares the same erbium-doped optical fiber, and two ends of the erbium-doped optical fiber have no melting points, so that the problem that in the prior art, the erbium-doped optical fiber needs to be welded with tail fibers of the optical devices in an erbium-doped optical fiber amplifier module, and a large space needs to be reserved for protecting the melting points is solved; therefore, the erbium-doped optical fiber amplifier module is further miniaturized.

Description

Technical Field

[0001] This utility model relates to the field of optical amplifier technology, specifically to an ultra-compact erbium-doped fiber amplifier. Background Technology

[0002] The development of optical communication technology is accompanied by the miniaturization of key devices required in optical communication network systems, especially the internal components of optical modules, which need to be miniaturized more quickly to save space and thus promote module miniaturization. The emergence of erbium-doped fiber amplifiers (EDFAs) has broken through the original limitations of optical fiber communication transmission distance, greatly promoting the development of optical fiber communication. As an important component of optical fiber communication systems, the demand for EDFAs is increasing daily. Due to the continuous pursuit of miniaturization in optical communication modules, EDFAs also urgently need to be miniaturized. Existing EDFA modules require fusion splicing of erbium-doped fiber with the pigtail of optical devices during manufacturing, necessitating a large space to protect the fusion point, thus limiting the miniaturization of EDFA modules. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the existing technology and provide an ultra-compact erbium-doped fiber amplifier.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] An ultra-compact erbium-doped fiber amplifier includes a pump laser, a composite isolation-wavelength division multiplexer integrating erbium-doped fiber, and an isolator integrating erbium-doped fiber.

[0006] The composite isolation-wavelength division multiplexer has three ports: a pump port, a signal port, and a common port.

[0007] The isolator has two ports, one for input and one for output.

[0008] The common terminal and the input terminal of the composite isolation-wavelength division multiplexer share the same erbium-doped optical fiber;

[0009] The pump end of the composite isolation-wavelength division multiplexer is connected to the pump laser, and the pump light generated by the pump laser is introduced into the erbium-doped fiber from the pump end; the signal end is used to introduce the signal light into the erbium-doped fiber; the common end is used for output, and the fiber of the common end is erbium-doped fiber.

[0010] The input fiber of the isolator is erbium-doped fiber, and the output is used to output the amplified signal light.

[0011] As an alternative implementation, the isolator is replaced with a composite isolator-spectrum-photodetector;

[0012] The composite isolation-spectrum-photodetector has two ports, namely an input port and an output port; the optical fiber at the input port is an erbium-doped fiber.

[0013] The common terminal of the composite isolation-wavelength division multiplexer and the input terminal of the composite isolation-spectrum splitter-photodetector share the same erbium-doped fiber.

[0014] As an alternative implementation, the isolator is replaced with a composite isolation-gain flattening filter;

[0015] The composite isolation-gain flattening filter has two ports, namely the input port and the output port; the optical fiber at the input port is erbium-doped fiber.

[0016] The common terminal of the composite isolation-wavelength division multiplexer and the input terminal of the composite isolation-spectrum splitter-photodetector share the same erbium-doped fiber.

[0017] As an alternative implementation, the isolator is replaced with a composite isolation-gain flattening filter-splitter-photodetector;

[0018] The composite isolation-gain flattening filter-splitter-photodetector has two ports, namely an input port and an output port; the optical fiber at the input port is an erbium-doped fiber.

[0019] The common terminal of the composite isolation-wavelength division multiplexer and the input terminal of the composite isolation-gain flattening filter-splitter-photodetector share the same erbium-doped fiber.

[0020] This utility model adopts the above technical solution, so that each optical device integrating erbium-doped fiber has one end sharing the same erbium-doped fiber. The two ends of the erbium-doped fiber have no melting point, which solves the problem in the prior art that the erbium-doped fiber amplifier module needs to be fused with the pigtail of the optical device and a large space needs to be reserved to protect the melting point, thereby realizing further miniaturization of the erbium-doped fiber amplifier module. Attached Figure Description

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0022] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of the present utility model;

[0023] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of the present invention;

[0024] Figure 3 This is a structural schematic diagram of Embodiment 3 of the present invention.

[0025] Figure 4This is a structural schematic diagram of Embodiment 4 of the present invention. Detailed Implementation

[0026] Example 1: As Figure 1 As shown, an ultra-compact erbium-doped fiber amplifier includes a pump laser 1, a composite isolation-wavelength division multiplexer 2 integrating erbium-doped fiber 6, and an isolator 7 integrating erbium-doped fiber 6. The composite isolation-wavelength division multiplexer 2 has three ports: a pump end 3, a common end 4, and a signal end 5. The isolator 7 has two ports: an input end 8 and an output end 9. The common end 4 of the composite isolation-wavelength division multiplexer 2 and the input end 8 of the isolator 7 share the same erbium-doped fiber 6. The pump end 3 of the composite isolation-wavelength division multiplexer 2 is connected to the pump laser 1, and the pump light generated by the pump laser 1 is introduced into the erbium-doped fiber 6 from the pump end 3. The signal end 5 is used to introduce signal light into the erbium-doped fiber 6. The common end 4 is used for output, and the fiber of the common end 4 is erbium-doped fiber 6. The fiber of the input end 8 of the isolator 7 is erbium-doped fiber 6, and the output end 9 is used to output the amplified signal light.

[0027] Working principle of Example 1: Pump laser 1 generates sufficiently strong pump light, which is injected into the erbium-doped fiber 6 at the common end 4 of the composite isolation-wavelength division multiplexer 2 through pump end 3, pumping the erbium ions in the ground state to the excited state in the erbium-doped fiber 6. The erbium ions in the excited state undergo a non-radiative transition to the metastable state. Due to the long energy level lifetime of erbium ions in the metastable state, population inversion easily occurs between the metastable and ground states, i.e., the number of erbium ion particles in the metastable state is greater than the number of erbium ion particles in the ground state. Signal light is injected into the erbium-doped fiber 6 at the common end 4 of the composite isolation-wavelength division multiplexer 2 through signal end 5. The signal photons interact with the erbium ions, generating stimulated emission, producing a large number of photons identical to themselves, thus rapidly increasing the number of signal photons transmitted through the erbium-doped fiber 6, i.e., amplifying the signal. The amplified signal is transmitted from the input terminal 8 of the isolator 7 to the output terminal 9 of the isolator 7, and is finally output.

[0028] Example 2: As Figure 2 As shown, Embodiment 2 is based on Embodiment 1, with the working principle being basically the same. The only difference is that the isolator 7 with integrated erbium-doped fiber 6 is replaced with a composite isolation-splitting-photodetector 10 with integrated erbium-doped fiber 6. The composite isolation-splitting-photodetector 10 has two ports, namely the input port 11 and the output port 12. The fiber of the input port 11 is erbium-doped fiber 6. The common port 4 of the composite isolation-wavelength division multiplexer 2 shares the same erbium-doped fiber 6 with the input port 11 of the composite isolation-splitting-photodetector 10.

[0029] Example 3: As Figure 3 As shown, Embodiment 3 is a modification of Embodiment 1, with essentially the same working principle, except that the isolator 7 integrating erbium-doped fiber 6 is replaced with a composite isolation-gain flattening filter 13 integrating erbium-doped fiber 6. The composite isolation-gain flattening filter 13 has two ports, namely an input port 14 and an output port 15. The fiber of the input port 14 is erbium-doped fiber 6. The common port 4 of the composite isolation-wavelength division multiplexer 2 shares the same erbium-doped fiber 6 with the input port 14 of the composite isolation-splitter-photodetector 13.

[0030] Example 4: Figure 4 As shown, Embodiment 4 is a modification of Embodiment 1, with essentially the same working principle, except that the isolator 7 integrating erbium-doped fiber 6 is replaced with a composite isolation-gain flattening filter-splitter-photodetector 16 integrating erbium-doped fiber 6. The composite isolation-gain flattening filter-splitter-photodetector 16 has two ports, namely an input port 17 and an output port 18. The fiber of the input port 17 is erbium-doped fiber 6. The common port 4 of the composite isolation-wavelength division multiplexer 2 shares the same erbium-doped fiber 6 with the input port 17 of the isolation-gain flattening filter-splitter-photodetector 16.

[0031] The above four embodiments are merely simple examples of erbium-doped fiber amplifiers. In addition to the specific embodiments described above, this invention can be implemented in other ways in actual design and application, such as: the above embodiments can be in the form of a pump laser-free amplifier, meaning whether or not a pump laser is included can be selected according to actual needs; devices can be selected according to actual needs; optical devices include, but are not limited to, single-sided devices and ultra-small devices; solutions where other optical devices besides those described in the above embodiments are integrated at both ends of the erbium-doped fiber; the other end of the erbium-doped fiber in the integrated erbium-doped fiber device may not necessarily need to integrate another device; devices including, but not limited to, using one or more integrated erbium-doped fibers; the melting point of the erbium-doped fiber itself and both ends can be set as needed; different optical devices can be integrated together through the same fiber, including but not limited to using erbium-doped fiber, single-mode fiber, etc.; using other rare-earth-doped fibers to amplify signals, etc.

[0032] Any modifications, substitutions, variations, or modifications to the embodiments without departing from the concept, principle, and purpose of this utility model shall be covered within the protection scope of this utility model.

Claims

1. An ultra-compact erbium-doped fiber amplifier, characterized in that: It includes a pump laser (1), a composite isolation-wavelength division multiplexer (2) with integrated erbium-doped fiber and an isolator (7) with integrated erbium-doped fiber. The composite isolation wavelength division multiplexer (2) has three ports, namely the pump terminal (3), the signal terminal (5) and the common terminal (4). The isolator (7) has two ports, namely the input port (8) and the output port (9). The common end (4) of the composite isolation wavelength division multiplexer (2) and the input end (8) of the isolator (7) share the same erbium-doped fiber (6). The pump end (3) of the composite isolation-wavelength division multiplexer (2) is connected to the pump laser (1), and the pump light generated by the pump laser (1) is introduced into the erbium-doped fiber (6) from the pump end (3); the signal end (5) is used to introduce the signal light into the erbium-doped fiber (6); the common end (4) is used for output, and the fiber of the common end (4) is the erbium-doped fiber (6). The optical fiber at the input end (8) of the isolator (7) is an erbium-doped optical fiber (6), and the output end (9) is used to output the amplified signal light.

2. The ultra-compact erbium-doped fiber amplifier according to claim 1, characterized in that: The isolator (7) is replaced by a composite isolator-spectrum-photodetector (10); The composite isolation-spectrum-photodetector (10) has two ports, namely an input port (11) and an output port (12); the optical fiber of the input port (11) is an erbium-doped optical fiber (6). The common terminal (4) of the composite isolation-wavelength division multiplexer and the input terminal (11) of the composite isolation-splitting-photodetector (10) share the same erbium-doped fiber (6).

3. The ultra-compact erbium-doped fiber amplifier according to claim 1, characterized in that: The isolator (7) is replaced by a composite isolation-gain flattening filter (13); The composite isolation-gain flattening filter (13) has two ports, namely an input port (14) and an output port (15); the optical fiber of the input port (14) is an erbium-doped optical fiber (6). The common terminal (4) of the composite isolation-wavelength division multiplexer and the input terminal (14) of the composite isolation-gain flattening filter (13) share the same erbium-doped fiber (6).

4. The ultra-compact erbium-doped fiber amplifier according to claim 1, characterized in that: The isolator (7) is replaced by a composite isolation-gain flattening filter-splitter-photodetector (16). The composite isolation-gain flattening filter-splitter-photodetector (16) has two ports, namely an input port (17) and an output port (18); the optical fiber of the input port (17) is an erbium-doped optical fiber (6). The common terminal (4) of the composite isolation-wavelength division multiplexer and the input terminal (17) of the composite isolation-gain flat filter-splitter-photodetector (16) share the same erbium-doped fiber (6).

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