CN221176919U - Optical amplifier - Google Patents

Abstract

The utility model relates to an optical amplifier, which comprises an input end, an isolator, a beam-splitting coupler, a wavelength division multiplexer, erbium ytterbium optical fibers and an output component which are sequentially arranged along an optical path; the large-splitting ratio end of the splitting coupler is connected with the wavelength division multiplexer, and the small-splitting ratio end of the splitting coupler is connected with the optical detector; the wavelength division multiplexer is coupled with a pumping light source; the output component is provided with a pump light reflecting sheet for reflecting pump light into the erbium ytterbium optical fiber. The utility model can reflect the pump light back to the optical path (the signal light continues to be transmitted to the output) by arranging the pump light reflecting sheet, and continuously provide energy for the erbium ytterbium active fiber, thus the structure can save 40% of the length of the active fiber. The input end of the double optical fiber head is provided with 980nm and 1550nm light, and the pump light reflecting sheet is used for reflecting 980nm light back again, so that the light is reused in the erbium ytterbium optical fiber, the utilization rate of the pump light is effectively improved, the loss is reduced, and the length of the active optical fiber is saved.

Description

Optical amplifier

Technical Field

The present utility model relates to the field of optical amplifiers, and in particular, to an optical amplifier.

Background

The erbium-doped optical fiber amplifier has the advantages of high gain, low noise, insensitivity to polarization and the like, is widely applied to an optical communication system to improve the output power of a transmitter, compensates the insertion loss of a communication line, is arranged in front of a receiver to improve the sensitivity of the receiver, and is an indispensable device of the optical fiber communication system.

The conventional single-stage erbium ytterbium fiber optical amplifier is shown in fig. 1, and comprises an input end 100, an isolator 110, a spectral coupler 120, a wavelength division multiplexer 150, an erbium ytterbium fiber 160, a high-power isolator 170, a spectral coupler 120 and an output end 180, which are sequentially arranged along an optical path; the erbium ytterbium optical fiber 160 is provided with an optical splitting coupler 120 along the upstream and downstream of the optical path; the small light splitting ratio end of the light splitting coupler 120 is connected with the light detector 130; the wavelength division multiplexer 150 is connected with a pump light source 140; each device is independently packaged and then connected with each other in an optical fiber welding mode to form an optical fiber optical amplifier; thus, the integration level of the optical amplifier is not high, and the miniaturization of the optical amplifier is affected; meanwhile, the pump light can generate waste in the erbium ytterbium optical fiber, and the utilization rate is not high.

Disclosure of utility model

First, the technical problem to be solved

In order to solve the above-mentioned problems of the prior art, the present utility model provides an optical amplifier.

(II) technical scheme

In order to achieve the above purpose, the main technical scheme adopted by the utility model comprises the following steps:

An optical amplifier comprises an input end, an isolator, a beam-splitting coupler, a wavelength division multiplexer, erbium ytterbium optical fiber and an output component which are sequentially arranged along an optical path; the large-splitting ratio end of the splitting coupler is connected with the wavelength division multiplexer, and the small-splitting ratio end of the splitting coupler is connected with the optical detector; the wavelength division multiplexer is coupled with a pumping light source; the output component is provided with a pump light reflecting sheet for reflecting pump light into the erbium ytterbium optical fiber.

Further, the output assembly comprises a double optical fiber head, a first birefringent crystal, a wave plate, a lens, a pumping light reflecting sheet, a rotary crystal, a partial reflecting film and an output detector, wherein the double optical fiber head, the first birefringent crystal, the wave plate, the lens, the pumping light reflecting sheet, the rotary crystal, the partial reflecting film and the output detector are arranged along an optical path.

Further, the reflection bandwidth of the pump light reflecting sheet is 900-1000nm.

Further, the transmission bandwidth of the pump light reflecting sheet is 1500-1600nm.

Further, the input end is connected with 1550nm signal light.

Further, the pump light source generates 980nm pump light.

(III) beneficial effects

The beneficial effects of the utility model are as follows: by arranging the pump light reflecting sheet, the pump light is reflected back to the optical path (the signal light continues to be transmitted to the output), and the energy is continuously provided for the erbium-ytterbium active fiber, so that the length of the active fiber can be saved by 40%. The input end of the double optical fiber head is provided with 980nm and 1550nm light, and the pump light reflecting sheet is used for reflecting 980nm light back again, so that the light is reused in the erbium ytterbium optical fiber, the utilization rate of the pump light is effectively improved, the loss is reduced, and the length of the active optical fiber is saved. On the other hand, the output component integrates a traditional independently packaged high-power isolator, a light splitting coupler and a light detector together, so that the whole structure is more compact; the mini EDFA already used in batch at present needs to be packed into a standard modular box of SFP, the box of SFP is approximately 42.3x16.25x8.5mm in size, and the circuits are needed to be put inside such size, so the whole size has very strict limit on the integration level and size of the device. By reasonable integration of the utility model, the volume can be effectively reduced compared with the traditional independent packaging.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present utility model and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an optical amplifier of the prior art;

FIG. 2 is a schematic diagram of the structure of the present utility model;

[ reference numerals description ]

100. An input end; 110. an isolator; 120. a spectral coupler; 130. a photodetector; 140. a pump light source; 150. a wavelength division multiplexer; 160. erbium ytterbium fiber; 170. a high power isolator; 180. an output end; 200. an output assembly; 210. a dual optical fiber head; 220. a first birefringent crystal; 230. a wave plate; 240. a lens; 250. rotating the crystal; 260. a partially reflective film; 270. an output detector; 300. and a pumping light reflecting sheet.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model. Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, based on the embodiments of the utility model, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in the specific direction, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "provided," "connected," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In a first embodiment, please refer to fig. 2:

The utility model discloses an optical amplifier, which comprises an input end 100, an isolator 110, a light splitting coupler 120, a wavelength division multiplexer 150, erbium ytterbium optical fiber 160 and an output assembly 200 which are sequentially arranged along an optical path; the input end 100 is a seed source or signal light, and the signal light is 1550nm; the large spectral ratio end of the optical coupler 120 is connected with the wavelength division multiplexer 150, and the small spectral ratio end is connected with the optical detector 130; the wavelength division multiplexer 150 is coupled with a pump light source 140; the pump light source 140 generates 980nm pump light; when the wavelength of the pumping light source 140 is 980nm and 1480nm, no excited state absorption exists, the pumping efficiency is high, the erbium-doped fiber is pumped by using a 980nm pumping laser, the ion inversion degree is high, and the amplifier noise is good. Due to the advantages of amplifier noise and cost when a 980nm pump light source is used, the 980nm pump light source is used as a preferential pump source of the erbium-doped fiber amplifier; the output assembly 200 is provided with a pump light reflecting sheet 300 for reflecting pump light into the erbium ytterbium fiber 160; the pump light is reflected back to the optical path (the signal light continues to be transmitted to the output) by the pump light reflecting sheet 300, and the energy is continuously provided for the erbium ytterbium active fiber, so that the length of the active fiber can be saved by 40 percent by the structure.

In one embodiment of the present utility model, the output assembly 200 includes a dual fiber head 210, a first birefringent crystal 220, a wave plate 230, a lens 240, a rotary crystal 250, a partially reflective film 260, and an output detector 270 disposed along an optical path; the input end of the dual optical fiber head 210 comprises 980nm (pump light) and 1550nm (signal light), the pump light reflecting sheet 300 is arranged at the rear end of the lens 240, the reflection bandwidth of the pump light reflecting film is 900-1000nm, and the transmission bandwidth is 1500-1600nm, so that the signal light can continue to transmit through the pump light reflecting film and finally output from the other output port of the dual optical fiber head 210, and the pump light is blocked to be reflected back to the erbium ytterbium active optical fiber again to be utilized; the birefringent crystal and the wave plate achieve the isolation effect through the angle deflection of polarized light, and the integration of multiple devices is realized.

In an embodiment of the present utility model, the erbium ytterbium fiber 160 is an erbium doped fiber for amplifying the signal light in cooperation with the pump light source 140.

In an embodiment of the present utility model, the photodetector 130 is configured to detect the optical power of the input signal light, and the output detector 270 is configured to detect the optical power of the output signal light, and monitor or control the amplifier according to the optical powers of the input signal light and the output signal light.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent changes made by the specification and drawings of the present utility model, or direct or indirect application in the relevant art, are included in the scope of the present utility model.

Claims (6)

1. An optical amplifier, characterized by: the optical fiber coupler comprises an input end (100), an isolator (110), a spectral coupler (120), a wavelength division multiplexer (150), an erbium-ytterbium optical fiber (160) and an output component (200) which are sequentially arranged along an optical path; the large-split-ratio end of the split coupler (120) is connected with the wavelength division multiplexer (150), and the small-split-ratio end is connected with the optical detector (130); the wavelength division multiplexer (150) is coupled with a pumping light source (140); the output assembly (200) is provided with a pump light reflecting sheet (300) for reflecting pump light into the erbium ytterbium optical fiber (160).

2. An optical amplifier according to claim 1, wherein: the output assembly (200) comprises a double-fiber head (210), a first birefringent crystal (220), a wave plate (230), a lens (240), a pump light reflecting sheet (300), a rotary crystal (250), a partial reflecting film (260) and an output detector (270) which are arranged along an optical path.

3. An optical amplifier according to claim 1, wherein: the reflection bandwidth of the pumping light reflecting sheet is 900-1000nm.

4. An optical amplifier according to claim 1, wherein: the transmission bandwidth of the pumping light reflecting sheet is 1500-1600nm.

5. An optical amplifier according to claim 1, wherein: the input end is connected with 1550nm signal light.

6. An optical amplifier according to claim 1, wherein: the pump light source generates 980nm pump light.