CN202841141U

CN202841141U - Ase light source

Info

Publication number: CN202841141U
Application number: CN 201220116138
Authority: CN
Inventors: 孙海明
Original assignee: SHANGHAI KENAITE LASER TECHNOLOGY Co Ltd
Current assignee: SHANGHAI KENAITE LASER TECHNOLOGY Co Ltd
Priority date: 2012-03-23
Filing date: 2012-03-23
Publication date: 2013-03-27
Anticipated expiration: 2022-03-23

Abstract

The utility model discloses an ASE light source, which comprises a first light splitter, a first wavelength division multiplexer, an ytterbium doped optical fiber, an isolator and a second light splitter which are sequentially connected, wherein the first wavelength division multiplexer is further connected to a pump. The ASE light source is characterized in that an optical fiber coil of the first light splitter is internally connected to the isolator. As a further improvement of the utility model, a second wavelength division multiplexer is connected between the first wavelength division multiplexer and the pump. The ASE light source disclosed by the utility model solves a self-excitation phenomenon produced by an ASE combining the optical fiber coil and a single-stage amplification structure when the power is greater than 20mW. The flatness of a light spectrum is less than 2dB at 1040nm-1085nm, thereby being smoother than a double-stage structure, and being more practical. From the point of cost, in order to achieve the same power output, the ASE light source needs less passive components, has shorter active fibers, and is lower in cost compared with a double-pole light path.

Description

The ASE light source

Technical field

The utility model relates to the fiber amplifier field, relates in particular to wideband light source.

Background technology

The ASE light source refers to a kind of wideband light source that the amplified spontaneous emission principle based on Active Optical Fiber is made into.As shown in Figure 1, at present, the ASE light source that is made into for Yb dosed optical fiber, when power during less than 20mW, what adopt is fiber turns+single step arrangement that 50: 50 optical splitters are made, this kind structure self-excitation phenomena as shown in Figure 2 can occur when power greater than 20mW the time, so when power during greater than 20mW, the general structure that adopts twin-stage to amplify, but adopt this structure, required passive device is more, and Active Optical Fiber is longer, cost is higher, and as shown in Figure 3 and Figure 4, the flatness of spectrum is relatively poor, adds the single step arrangement deviation of having compared with annular chamber.Therefore in practice, although fiber turns+single step arrangement can produce self-excitation phenomena, still be widely used.

Summary of the invention

The purpose of this utility model is aimed at the problem that prior art exists, and a kind of novel fiber turns+single-stage structure for amplifying ASE light source is provided, and has solved the self-excitation phenomena that produces during greater than 20mW when power.

ASE light source of the present utility model comprises one first optical splitter that connects successively, first wave division multiplexer (WDM), one Yb dosed optical fiber, one isolator and one second optical splitter, described first wave division multiplexer also is connected with a pumping, is connected with an isolator in the fiber turns of the first optical splitter of described ASE light source.

Regard the reflection end face of isolator as a minute surface that transmission is very high, reflection is very low, this minute surface of fiber turns and isolator has just formed a resonant cavity so, adds isolator in fiber turns inside and effectively reduces the threshold value that self-excitation produces.Simultaneously, destroyed because the relevant condition of the two-beam that optical splitter separates, reduced because coherenceof light, on the impact of light path, thereby improved the stability of light path.

As further improvement of the utility model: be connected with a Second Wave division multiplexer between described first wave division multiplexer and the described pumping.By add a wavelength division multiplexer at the pumping end, a part of untapped pump light and reverse ASE are leaked out by wavelength division multiplexer, thereby play the effect of protection pumping.

Description of drawings

Fig. 1 is the ASE light supply apparatus of traditional fiber turns+single step arrangement;

Fig. 2 is the traditional ASE light supply apparatus spectrum schematic diagram when producing self-excitation phenomena;

Fig. 3 is the spectrogram of ASE light source when 20mW power of traditional fiber turns+single step arrangement;

Fig. 4 is the spectrogram of ASE light source when 20mW power of two-stage structure;

Fig. 5 is the structural representation of the utility model ASE light source;

Fig. 6 is the spectrogram of the utility model ASE light source when 50mW power.

Embodiment

For the benefit of ASE light source of the present utility model is done further to understand, describe below in conjunction with drawings and Examples.

With reference to shown in Figure 5, ASE light source of the present utility model mainly comprises: one first optical splitter 1 that connects successively, first wave division multiplexer 2, one Yb dosed optical fiber 4, one isolator 5 and one second optical splitter 6, described first wave division multiplexer 2 also is connected with a pumping 7, is connected with one 1064 isolators 8 in the fiber turns of the first optical splitter 1 of described ASE light source, and fiber turns is comprised of 50: 50 optical splitters.

As further improvement of the utility model: be connected with a Second Wave division multiplexer 3 between described first wave division multiplexer 2 and the described pumping.

When work, do the pumping optical coupling with pumping 7 and enter Yb dosed optical fiber 4, Yb dosed optical fiber 4 is with excited absorption pump energy, formation population inversion, if do not consider the existence of flashlight and laser, the particle of these counter-rotatings will be got back to ground state by the mode of spontaneous radiation, because glass matrix Yb dosed optical fiber 4 has extremely wide emission cross section spectrum, thereby Yb dosed optical fiber 4 all produces spontaneous radiation in extremely wide spectral region.But, for the such fibre-optic waveguide structure of Yb dosed optical fiber 4, as long as the broadband spontaneous radiation of section's any point place generation within it is within its numerical aperture, all will in Yb dosed optical fiber 4, form guided mode, and finally in the transmission course of Yb dosed optical fiber 4, form so-called amplified spont-aneous emission (ASE) because of the effect of pumping light.

ASE is divided into forward ASE and reverse ASE, wherein oppositely ASE through 50: 50 two arms on the optical splitter 1 in two, wherein half is isolated device 8 isolation, second half amplifies through row through Yb dosed optical fiber 4 again by isolator, ASE exports with forward.

The stack of first wave division multiplexer 2 and Second Wave division multiplexer 3, when wavelength division multiplexer 2 that reverse ASE is transferred to, because wavelength division multiplexer 2 is reciprocal type devices, the reverse ASE peak that is produced by Yb dosed optical fiber 4 will almost nondestructively be back to the pumping end of wavelength division multiplexer 2.Add a wavelength division multiplexer 3 at the pumping end, a part of untapped pump light and reverse ASE are leaked out by wavelength division multiplexer, thereby play the effect of protection pumping.

After in fiber turns, adding isolator 8, isolated 1/2 reverse ASE light source and amplified and the signal of generation through Yb dosed optical fiber, therefore, the length of Active Optical Fiber must be partially short, needs to lengthen the length of Active Optical Fiber.

Below embodiment has been described in detail the utility model by reference to the accompanying drawings, and those skilled in the art can make the many variations example to the utility model according to the above description.Thereby some details among the embodiment should not consist of restriction of the present utility model, and the scope that the utility model will define with appended claims is as protection range of the present utility model.

Claims

1. an ASE light source comprises one first optical splitter that connects successively, the first wave division multiplexer, one Yb dosed optical fiber, one isolator and one second optical splitter, described first wave division multiplexer also is connected with a pumping, it is characterized in that: be connected with an isolator in the fiber turns of described the first optical splitter.

2. ASE light source according to claim 1 is characterized in that: be connected with a Second Wave division multiplexer between described first wave division multiplexer and the described pumping.