A C-band few-mode erbium-doped fiber amplifier

Abstract

This utility model belongs to the technical field of fiber optic amplifier equipment, specifically relating to a C-band few-mode erbium-doped fiber amplifier, comprising: an input-end few-mode pigtail, an input-end few-mode to single-mode mode field adapter, an input-end single-mode isolator, a single-mode wavelength division multiplexer, a single-mode pump, a single-mode erbium-doped fiber, an output-end single-mode isolator, an output-end single-mode to few-mode mode field adapter, and an output-end few-mode pigtail; wherein, the input-end few-mode pigtail, the input-end few-mode to single-mode mode field adapter, the input-end single-mode isolator, the single-mode wavelength division multiplexer, the single-mode erbium-doped fiber, the output-end single-mode isolator, the output-end single-mode to few-mode mode field adapter, and the output-end few-mode pigtail are sequentially connected by fiber optic fusion splicing; the single-mode pump and the single-mode wavelength division multiplexer are connected by fiber optic fusion splicing.

Description

Technical Field

[0001] This utility model belongs to the technical field of fiber optic amplifier equipment, specifically relating to a C-band few-mode erbium-doped fiber optic amplifier. Background Technology

[0002] Existing fiber amplifier equipment typically uses devices such as few-mode erbium-doped fiber, few-mode couplers, and few-mode wavelength division multiplexers to achieve few-mode optical amplification, which is costly. Furthermore, the key indicator of few-mode EDFA (Erbium Doped Fiber Amplifier) ​​is a noise figure of 6dB, which is relatively high. Utility Model Content

[0003] To address the problems existing in the prior art, this utility model provides a C-band few-mode erbium-doped fiber amplifier. The aim is to convert the input few-mode light into single-mode light and amplify it by fusing a few-mode to single-mode mode field adapter after the few-mode jumper at the input end, and to achieve few-mode light amplification by fusing a single-mode to few-mode mode field adapter at the output end. The connection method adopts fiber optic splicing, which is low in cost and low in noise figure.

[0004] To achieve the above objectives, this utility model provides the following solution:

[0005] A C-band few-mode erbium-doped fiber amplifier, comprising: an input-end few-mode pigtail, an input-end few-mode to single-mode mode field adapter, an input-end single-mode isolator, a single-mode wavelength division multiplexer, a single-mode pump, a single-mode erbium-doped fiber, an output-end single-mode isolator, an output-end single-mode to few-mode mode field adapter, and an output-end few-mode pigtail;

[0006] Among them, the light-inlet few-mode pigtail, the light-inlet few-mode to single-mode mode field adapter, the light-inlet single-mode isolator, the single-mode wavelength division multiplexer, the single-mode erbium-doped fiber, the light-outlet single-mode isolator, the light-outlet single-mode to few-mode mode field adapter and the light-outlet few-mode pigtail are connected in sequence by fiber fusion splicing.

[0007] The single-mode pump and the single-mode wavelength division multiplexer are connected by fiber optic fusion splicing.

[0008] Preferably, both the light-inlet and light-outlet few-mode pigtails are Pigtail-LMA-25 / 300-1m.

[0009] Preferably, the mode field adapter for converting a few modes to a single mode at the light inlet is MFA-25 / 300-9 / 125-1m.

[0010] Preferably, both the input-side single-mode isolator and the output-side single-mode isolator are ISO-9 / 125-1m.

[0011] Preferably, the single-mode wavelength division multiplexer is WDM-6 / 125-1m.

[0012] Preferably, the single-mode pump is DG-HM02-7645B-400SM.

[0013] Preferably, the single-mode erbium-doped fiber is Er-1012-A.

[0014] Preferably, the single-mode to multi-mode mode field adapter at the light output end is MFA-9 / 125-25 / 300-1m.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention uses a mode field adapter to achieve the conversion of few-mode to single-mode light at the input end. In EDFA, devices such as erbium-doped fiber, coupler, and wavelength division multiplexer can all use single-mode devices. The output end uses a single-mode to few-mode mode field adapter, which greatly reduces the cost and the noise figure can reach 5.365dB, which is 0.635dB lower than the existing technical solutions. Attached Figure Description

[0017] To more clearly illustrate the technical solution of this utility model, the drawings used in the embodiments are briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of a C-band few-mode erbium-doped fiber amplifier according to an embodiment of the present invention;

[0019] Figure 2 This is a schematic diagram of the noise figure of a few-mode EDFA measured by a spectrometer in an embodiment of this utility model;

[0020] Among them, 1-Inlet few-mode pigtail; 2-Inlet few-mode to single-mode mode field adapter; 3-Inlet single-mode isolator; 4-Single-mode wavelength division multiplexer; 5-Single-mode pump; 6-Single-mode erbium-doped fiber; 7-Outlet single-mode isolator; 8-Outlet single-mode to few-mode mode field adapter; 9-Outlet few-mode pigtail. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] Example 1

[0024] like Figure 1 As shown, this utility model provides a C-band few-mode erbium-doped fiber amplifier, comprising: an input-end few-mode pigtail 1, an input-end few-mode to single-mode mode field adapter 2, an input-end single-mode isolator 3, a single-mode wavelength division multiplexer 4, a single-mode pump 5, a single-mode erbium-doped fiber 6, an output-end single-mode isolator 7, an output-end single-mode to few-mode mode field adapter 8, and an output-end few-mode pigtail 9;

[0025] Among them, the light-inlet few-mode pigtail 1, the light-inlet few-mode to single-mode mode field adapter 2, the light-inlet single-mode isolator 3, the single-mode wavelength division multiplexer 4, the single-mode erbium-doped fiber 6, the light-outlet single-mode isolator 7, the light-outlet single-mode to few-mode mode field adapter 8 and the light-outlet few-mode pigtail 9 are connected in sequence by optical fiber fusion splicing.

[0026] The single-mode pump 5 and the single-mode wavelength division multiplexer 4 are connected by optical fiber fusion splicing.

[0027] Specifically:

[0028] The input few-mode fiber 1 is Pigtail-LMA-25 / 300-1m, and its function is to transmit few-mode light.

[0029] The input few-mode to single-mode mode field adapter 2 is MFA-25 / 300-9 / 125-1m, and its function is to convert few-mode light into single-mode light.

[0030] The single-mode isolator 3 at the light inlet is ISO-9 / 125-1m. Its function is to protect the light source and isolate the reverse-transmitted light and the reverse-transmitted pump light.

[0031] The single-mode wavelength division multiplexer 4 is a WDM-6 / 125-1m, whose function is to couple the signal light and pump light into the same optical fiber.

[0032] The single-mode pump 5 is DG-HM02-7645B-400SM. Its function is a laser that provides energy to enable erbium ions in erbium-doped fiber to transition from the ground state to the excited state.

[0033] The single-mode erbium-doped fiber 6 is Er-1012-A, and its function is to amplify the signal light by working together with the pump.

[0034] The single-mode isolator 7 at the output end is ISO-9 / 125-1m, and its function is to isolate the reverse-transmitted light and the forward-transmitted pump light.

[0035] The single-mode to few-mode mode field adapter 8 at the light output end is MFA-9 / 125-25 / 300-1m, and its function is to convert single-mode light into few-mode light.

[0036] The output few-mode fiber 9 is a Pigtail-LMA-25 / 300-1m, function: to transmit few-mode light.

[0037] The entire optical path of the C-band few-mode erbium-doped fiber amplifier is connected via fiber fusion splicing. The few-mode light is transmitted from the input few-mode pigtail 1 into the input few-mode to single-mode mode field adapter 2, where it is converted from few-mode light to single-mode light. The single-mode light is output through the input single-mode isolator 3 and coupled with the pump light output from the single-mode pump 5 through the single-mode wavelength division multiplexer 4 into an optical fiber to output signal light. The signal light enters the single-mode erbium-doped fiber 6 for optical amplification (principle: erbium ions in the single-mode erbium-doped fiber 6 absorb the pump light entering from the single-mode wavelength division multiplexer 4, causing electrons to transition from the ground state to the excited state. The excited electrons release energy through a rapid non-radiative transition and transfer to the metastable state. The signal light passing through the single-mode wavelength division multiplexer 4 passes through the single-mode erbium-doped fiber 6, where it is amplified due to stimulated emission). The amplified signal light enters the output single-mode to few-mode mode field adapter 8 through the output single-mode isolator 7, where it is converted back into few-mode light and output through the output few-mode pigtail 9.

[0038] The noise figure of the few-mode EDFA measured by a spectrometer is as follows: Figure 2 As shown, the input optical power is -40dBm, the output optical power is -5dBm, and the noise figure is 5.365dB.

[0039] In summary, the C-band few-mode erbium-doped fiber amplifier provided by this invention can reduce the cost of few-mode fiber amplifiers and improve the noise figure.

[0040] The embodiments described above are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Any modifications and improvements made to the technical solutions of the present utility model by those skilled in the art without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A C-band few-mode erbium-doped fiber amplifier, characterized in that, The erbium-doped fiber amplifier includes: an input-end few-mode pigtail, an input-end few-mode to single-mode mode field adapter, an input-end single-mode isolator, a single-mode wavelength division multiplexer, a single-mode pump, a single-mode erbium-doped fiber, an output-end single-mode isolator, an output-end single-mode to few-mode mode field adapter, and an output-end few-mode pigtail. Among them, the light-inlet few-mode pigtail, the light-inlet few-mode to single-mode mode field adapter, the light-inlet single-mode isolator, the single-mode wavelength division multiplexer, the single-mode erbium-doped fiber, the light-outlet single-mode isolator, the light-outlet single-mode to few-mode mode field adapter and the light-outlet few-mode pigtail are connected in sequence by fiber fusion splicing. The single-mode pump and the single-mode wavelength division multiplexer are connected by fiber optic fusion splicing.

2. The C-band few-mode erbium-doped fiber amplifier of claim 1, wherein, Both the light-inlet and light-outlet few-mode pigtails are Pigtail-LMA-25 / 300-1m.

3. The C-band few-mode erbium-doped fiber amplifier of claim 1, wherein, The mode field adapter for the light-input multimode to single-mode mode field is MFA-25 / 300-9 / 125-1m.

4. The C-band few-mode erbium-doped fiber amplifier of claim 1, wherein, Both the input-side single-mode isolator and the output-side single-mode isolator are ISO-9 / 125-1m.

5. The C-band few-mode erbium-doped fiber amplifier of claim 1, wherein, The single-mode wavelength division multiplexer is WDM-6 / 125-1m.

6. The C-band few-mode erbium-doped fiber amplifier of claim 1, wherein, The single-mode pump is DG-HM02-7645B-400SM.

7. The C-band few-mode erbium-doped fiber amplifier of claim 1, wherein, The single-mode erbium-doped fiber is Er-1012-A.

8. The C-band few-mode erbium-doped fiber amplifier of claim 1, wherein, The single-mode to multi-mode mode field adapter at the output end is MFA-9 / 125-25 / 300-1m.

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