Integrated optical fiber amplifier

Abstract

The utility model discloses an integrated optical fiber amplifier which comprises a polarization-maintaining beam combiner and an integrated amplification module connected with the polarization-maintaining beam combiner through a gain optical fiber, and the integrated amplification module comprises a first collimator with a CPS function, a filter, a PDI magnet and a second collimator with output split light which are arranged in sequence. The first collimator is respectively provided with a signal input port and a CPS module, the PDI magnet is sequentially provided with a 0-degree polarizer, a Faraday rotator and a 45-degree polarization analyzer, and the second collimator is provided with a main output port; optical fiber welding points are reduced during manufacturing, optical loss of a system is reduced, the integration of an amplification optical path of the optical fiber laser is improved, and nonlinearity in the amplification optical path of the laser is reduced.

Description

TECHNICAL FIELD

[0001] The utility model belongs to optical fiber laser technical field relates to a kind of integrated optical fiber amplifier for laser. BACKGROUND

[0002] The existing laser fiber amplifier as shown in Figure 1 Mainly include polarization maintaining combiner 01, polarization maintaining cladding pumping module 02, polarization maintaining isolator 03, polarization maintaining coupler 04 and polarization maintaining filter 05 five independent optical fiber components, due to the number of components is too much, the reliability of discrete components and the additional fusion point introduced, directly affect the stability inside the entire laser amplifier optical path.

[0003] And importantly, due to the link of light is longer, the nonlinear effect accumulated in optical pulse therein increases, leading to nonlinear accumulation causes the signal-to-noise ratio of output spectrum to drop significantly.Finally, due to the process of production is more, manpower and material cost are higher. INVENTION CONTENTS

[0004] The utility model aims at providing a kind of integrated optical fiber amplifier, to improve the integration of optical fiber amplifier for laser, reduce the nonlinearity inside the laser amplifier optical path, can be used for optimizing output signal-to-noise ratio, improve the reliability of optical path.

[0005] The utility model solves the technical scheme that it adopts to its technical problem is as follows: a kind of integrated optical fiber amplifier, including polarization maintaining combiner and integrated amplification module connected with polarization maintaining combiner by gain optical fiber, the integrated amplification module includes sequentially arranged first collimator with CPS function, filter sheet, PDI magnet and second collimator with output light splitting, first collimator is respectively provided with signal input port and CPS module on, PDI magnet is sequentially provided with 0 ° polarizer, Faraday rotator and 45 ° polarizing beam splitter on second collimator, second collimator is provided with main output port.

[0006] The second collimator of the integrated optical fiber amplifier is also provided with output monitoring port.

[0007] The second collimator of the integrated optical fiber amplifier is also provided with output monitoring port.

[0008] The utility model discloses a beneficial effect is: the utility model discloses the CPS module, first collimator, filter, PDI magnet, 0 degree polarizer, Faraday rotator, 45 degree polarizing filter, second collimator and main output port are integrated into an integrated amplification module, replace the polarization maintaining cladding pumped module, polarization maintaining isolator, polarization maintaining coupler and polarization maintaining filter four independent optical fiber components of existing optical fiber amplifier, highly integrated polarization maintaining fiber coupler function, polarization maintaining filter function and polarization maintaining fiber isolator function, not only when making optical fiber fusion joint point reduces, and the optical loss of system reduces, applicable to improve the integration of optical fiber laser amplification light path, reduce the nonlinearity in the laser amplification light path, can be used for optimizing pulse quality, improve the reliability of light path. BRIEF DESCRIPTION OF DRAWINGS

[0009] Figure 1 It is the structural schematic diagram of existing optical fiber amplifier;

[0010] Figure 2 It is the structural schematic diagram of the utility model;

[0011] Figure 3 It is the structural schematic diagram of integrated amplification module of the utility model.

[0012] Each reference sign is: 01 - polarization maintaining beam combiner, 02 - polarization maintaining cladding pumped module, 03 - polarization maintaining isolator, 04 - polarization maintaining coupler, 05 - polarization maintaining filter, 1 - signal input port, 2 - CPS module, 3 - first collimator, 4 - filter, 5 - PDI magnet, 6 - 0 degree polarizer, 7 - Faraday rotator, 8 - 45 degree polarizing filter, 9 - second collimator, 10 - output monitoring port, 11 - main output port. DETAILED DESCRIPTION

[0013] The utility model will be further described in connection with the drawings and specific embodiment.

[0014] Referring to Figure 2 The utility model discloses a kind of integrated optical fiber amplifiers, including polarization maintaining beam combiner 01 and integrated amplification module connected by gain optical fiber with polarization maintaining beam combiner 01.

[0015] Referring to Figure 3 The integrated amplification module includes sequentially arranged first collimator 3 with CPS function, filter 4, PDI magnet 5 and second collimator 9 with output light splitting, signal input port 1 and CPS module 2 are respectively provided on the first collimator 3, 0 degree polarizer 6, Faraday rotator 7 and 45 degree polarizing filter 8 are sequentially provided on the PDI magnet 5, output monitoring port 10 and main output port 11 are provided on the second collimator 9.

[0016] The utility model discloses a new optical fiber function module input end integration filter piece 4, realize filter function, PDI magnet 5, 0 degree polarizer 6, faraday rotator 7 and 45 degree polarizing beam splitter 8 realize PDI (polarization isolator function), second collimator 9 end face coating film 0.5% beam splitter film, realize 0.5% beam splitter output function, output monitoring port 10 provides monitoring function, by this module main part provides optical amplification, optical isolation, output monitoring function.

[0017] Compared with the prior art optical fiber amplifier adopting the structure of polarization maintaining combiner 01+PMCPS+PMISO+PMFUC+PMBPF, the utility model adopts the structure of polarization maintaining combiner 01+signal input port 1+CPS module 2+first collimator 3+filter piece 4+PDI magnet 5+0 degree polarizer 6+faraday rotator 7+45 degree polarizing beam splitter 8+second collimator 9+main output port 11, and the CPS module 2, first collimator 3, filter piece 4, PDI magnet 5, 0 degree polarizer 6, faraday rotator 7, 45 degree polarizing beam splitter 8, second collimator 9 and main output port 11 are integrated into an integrated amplification module, high reliability is provided through high integration, the melting point is further reduced, and 50% can be reduced; the module main part provides optical isolation function through the integration of the filter function at the module input end, the module output end integrates 0.5% optical path monitoring function; and the high reliability process technology of optical communication optical fiber passive module is adopted, and the nonlinearity in the internal laser amplifier optical path is reduced.

[0018] According to the reduction of 1.5m of the polarization maintaining optical fiber length, the nonlinear phase shift is reduced by 3.87*10 -3 *P (average) / F (repetition frequency) *L (cavity length) =48.375, wherein P (average) =2W, F (repetition frequency) =400K; pulse width=600PS, L (cavity length) =1.5m. -3 According to the reduction of 2.1m of the polarization maintaining optical fiber length, the nonlinear phase shift is reduced by 3.87*10 *P (average) / F (repetition frequency) *L (cavity length) =67.725, wherein P (average) =2W, F (repetition frequency) =400K; pulse width=600PS, L (cavity length) =2.1m.

[0019] The above embodiment only exemplarily illustrates the principle and effect of the utility model and part of the applied embodiments, and the person skilled in the art can make a number of deformations and improvements without departing from the creative concept of the utility model, and these all belong to the protection scope of the utility model.

Claims

1. An integrated fiber amplifier, characterized by: The application relates to a polarization maintaining combiner (01) and an integrated amplification module connected with the polarization maintaining combiner (01) through a gain optical fiber, wherein the integrated amplification module comprises a first collimator (3), a filter (4), a PDI magnet (5) and a second collimator (9) arranged in sequence; the first collimator (3) is respectively provided with a signal input port (1) and a CPS module (2); the PDI magnet (5) is sequentially provided with a 0-degree polarizer (6), a Faraday rotator (7) and a 45-degree polarizer (8); and the second collimator (9) is provided with a main output port (11).

2. An integrated fiber amplifier as claimed in claim 1, characterized in that The second collimator (9) is further provided with an output monitoring port (10).

3. An integrated fiber amplifier as claimed in claim 1 or 2, characterized in that The end surface of the second collimator (9) is provided with a 0.5% light splitting film.

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