CN103794974A

CN103794974A - Novel fiber amplifier

Info

Publication number: CN103794974A
Application number: CN201210432191.XA
Authority: CN
Inventors: 凌吉武; 吴砺; 贺坤; 张党卫; 莫霜; 校金涛
Original assignee: Photop Technologies Inc
Current assignee: Photop Technologies Inc
Priority date: 2012-10-31
Filing date: 2012-10-31
Publication date: 2014-05-14

Abstract

The invention discloses a novel fiber amplifier. The novel fiber amplifier comprises a multimode LD pumped source, a pumped coupling fiber system, a double-cladding gain medium, a signal light source and a variable optical attenuator. The pump light of the multimode LD pumped source, after passing through the pumped coupling fiber system, is incident on the double-cladding gain medium; at the same time, a signal light source is incident on the double-cladding gain medium through a tail fiber for signal light amplification; amplified signal light, after passing through the double-cladding gain medium, is incident on the variable optical attenuator; the double-cladding gain medium comprises a gain medium outer wrapping layer, a gain inner wrapping layer and a gain medium; the gain medium is a fiber core or Er-doped glass which is doped with more than one rare earth ions; the multimode LD pumped light source has a pumping mode of side surface pumping; and the pumping intensity of the multimode LD pumped light source enables each double-cladding gain medium to reach a saturation and gain degree.

Description

A kind of novel optical fiber amplifier

Technical field

The present invention relates to amplifier region, relate in particular to a kind of novel optical fiber amplifier.

Background technology

In optical communication field, especially er-doped ionic light of fiber amplifier fiber amplifier (EDFA) is a kind of very important active device, and it is the core devices of long-distance optical communication.The scheme that present fiber amplifier adopts be conventionally by flashlight by one section of gain fibre of er-doped or other doping, the LD of coupling input simultaneously pump light, to realize the gain amplification of flashlight.Due to the increase of transinformation, and the increase of optical communication line, usually need in actual applications the light signal of multiple circuits to amplify, amplify respectively with regard to the multiple EDFA of needs so, cost will improve like this, and multiple EDFA have also increased the complexity of whole light communication system, its volume also increases thereupon.

Adopted various rare earth doped gain fibre Amplifier Design modes to improve the gain coefficient of optical fiber both at home and abroad, and adopt multimode pumping source with different incident and pump mode to reduce the production cost of device.As China Patent Publication No. be CN101383474A the technical scheme of " optical fiber array amplifier that multichannel is amplified ", a kind of amplifier that comprises double-cladding two-dimensional array optical fiber, multiple die semiconductor laser, multiple fibre optic isolater, silica fiber array is disclosed, its flashlight enters in double clad doped core through optical fiber circulator and silica fiber array, multimode pump light is coupled into cladding pumping through lens and dichroic mirror, makes to input Ge road flashlight and is once amplified.Adopt said method can solve to a certain extent device miniaturization and cheap problem, but, this structure exists the adjusting difficulty of silica fiber array large, cause flashlight insertion loss to increase, pumping efficiency is not high, pump light utilance is low, and the Maximum pumping that adopts this end pumping mode to improve is limited.

Summary of the invention

The object of the present invention is to provide one can realize multimode pumping, multichannel is amplified, obtain high power adjustable stable output, compact conformation, be easy to integrated, novel optical fiber amplifier cheaply.

The present invention adopts following design for achieving the above object, it comprises multimode LD pumping source, pumping coupled fiber system, double clad gain media, signal optical source and variable optical attenuator, the pump light of described multimode LD pumping source incides double clad gain media after pumping coupled fiber system, synchronous signal light source incides double clad gain media by tail optical fiber and carries out flashlight amplification, incide variable optical attenuator through amplifying signal light through the tail optical fiber of double clad gain media, the pump mode of described multimode LD pump light source is profile pump, the pump intensity of described multimode LD pump light source makes each double clad gain media gain degree that reaches capacity.

Described double clad gain media comprises gain media surrounding layer, gain media inner cladding and gain media,

Described gain media is fiber core or the er doped silica glasses that is mixed with more than one rare earth ions.

In described fiber core, be mixed with erbium ion or be mixed with erbium ion and ytterbium ion simultaneously.

Described pumping coupled fiber system is multimode fiber fused biconical taper directional couple optical fiber or closes bundle fibre system.

Described multimode LD pump light source is that single tube LD pump light source, array LD pump light source maybe can be modulated LD pulse pump light source.

The present invention adopts above design, by adopting profile pump mode, has improved pumping light intensity; By adopting fused biconical taper directional couple coupling fiber, reduce insertion loss; By adopting the double clad gain media that can make to reach the pumping light intensity of its saturation intensity, avoid the unstable of the amplification luminous power that causes because of external disturbance, make to amplify luminous power in stable state; By the gain media of double clad gain media is adopted to er doped silica glasses or fiber core, reduce the cost of manufacture of gain media; By adopting LD pump light source, many pumpings, multichannel amplification are realized; By adopting variable optical attenuator, amplify adjustable for realizing to each flashlight gain; Overall structure is simpler, is easy to integrated.

Accompanying drawing explanation

Below in conjunction with the drawings and specific embodiments, invention is described in further detail:

Fig. 1 is fiber amplifier structural representation of the present invention.

Embodiment

As shown in Figure 1, in figure to be provided with three tunnel signal sources, three tunnels are output as example and describe, it comprises multimode LD pumping source 104 the present invention, pumping coupled fiber system 105, double clad gain media 106, signal

optical source

101, 102 and 103 and variable

optical attenuator

110, 111 and 112, the pump light of described multimode LD pumping source 104 incides double clad gain media 106 after pumping coupled fiber system 105, the ion that makes to gain is realized population inversion, synchronous

signal light source

101, 102 and 103 incide double clad gain media 106 by tail optical fiber carries out flashlight amplification, after double clad gain media 106, incide variable optical attenuator 110 through amplifying signal light, 111 and 112 carry out power output adjusting, described double clad gain media 106 comprises gain media surrounding layer 107, gain media inner cladding 108 and gain media 109, described gain media 109 can be the fiber core that is mixed with erbium or is mixed with other rare earth ions such as erbium and ytterbium simultaneously, also can adopt er doped silica glasses to replace, the pump mode of described multimode LD pump light source 104 is profile pump, described pumping coupled fiber system 105 is for multimode fiber fused biconical taper directional couple fibre system or close bundle fibre system, the pump intensity of described multimode LD pump light source 104 can make each double clad gain media 106 gain degree that reaches capacity, concrete can improve total pumping light intensity by the exciting current and the LD array elements quantity that increase multimode LD pump light source 104.

Described multimode LD pump light source 104 is that single tube LD pump light source, array LD pump light source maybe can be modulated LD pulse pump light source.

The tail optical fiber of described signal optical source 101,102 and 103 and double clad gain media 106 are realized flashlight input by welding.

In concrete enforcement; each fibre core can be that any root single mode or multimode gain core are arranged with different distributed architectures; each optics or the optoelectronic component of composition fiber amplifier can form all optical fibre structure or non-all optical fibre structure; also can insert therein other optics that can change Output of laser performance or optoelectronic components, can increase the corresponding film of plating system at each element end face.

Claims

1. a novel optical fiber amplifier, it is characterized in that: it comprises multimode LD pumping source, pumping coupled fiber system, double clad gain media, signal optical source and variable optical attenuator, the pump light of described multimode LD pumping source incides double clad gain media after pumping coupled fiber system, synchronous signal light source incides double clad gain media by tail optical fiber and carries out flashlight amplification, after double clad gain media, incide variable optical attenuator through amplifying signal light, the pump mode of described multimode LD pump light source is profile pump, the pump intensity of described multimode LD pump light source makes each double clad gain media gain degree that reaches capacity.

2. a kind of novel optical fiber amplifier according to claim 1, it is characterized in that: described double clad gain media comprises gain media surrounding layer, gain media inner cladding and gain media, described gain media is fiber core or the er doped silica glasses that is mixed with more than one rare earth ions.

3. a kind of novel optical fiber amplifier according to claim 2, is characterized in that: in described fiber core, be mixed with erbium ion or be mixed with erbium ion and ytterbium ion simultaneously.

4. a kind of novel optical fiber amplifier according to claim 1, is characterized in that: described pumping coupled fiber system is multimode fiber fused biconical taper directional couple optical fiber or closes bundle fibre system.

5. a kind of novel optical fiber amplifier according to claim 1, is characterized in that: the tail optical fiber of described signal optical source and double clad gain media are realized flashlight input by welding.

6. a kind of novel optical fiber amplifier according to claim 1, is characterized in that: described multimode LD pump light source is that single tube LD pump light source, array LD pump light source maybe can be modulated LD pulse pump light source.