CN202870326U - A bandpass optical filter containing a multilayer film structure - Google Patents

Abstract

The utility model discloses a bandpass optical filter containing a multilayer film structure. The bandpass optical filter containing a multilayer film structure comprises a substrate, multiple Ta2O5 film layers, and multiple film layers with low refractive index. The multiple Ta2O5 film layers and the multiple film layers with low refractive index are laminated on the substrate. The multiple Ta2O5 film layers and multiple SiO2 film layers are arranged alternately. Thirty eight Ta2O5 film layers are provided while thirty seven SiO2 film layers are provided. The bandpass optical filter containing a multilayer film structure has high light transparency. And only light with a wavelength of 1490 nm may pass through the bandpass optical filter containing a multilayer film structure, achieving strong selectivity.

Description

A kind of bandpass filter with multiple film layer structure

Technical field

The utility model relates to a kind of bandpass filter with multiple film layer structure, is applied to optical communication field.

Background technology

Optical communications wavelength has three of 1310nm, 1490nm, 1550nm at present, because light is less in the absorption at this wavelength place, therefore its transmission range in optical fiber farthest, but existing optical communication device can't optionally allow wherein a kind of light (1490nm) by intercepting other two kinds of light.

The utility model content

Technical problem to be solved in the utility model provides a kind of bandpass filter with multiple film layer structure, and this bandpass filter with multiple film layer structure has high transmission rate, and only allows the wavelength be that the light of 1490nm passes through, and selectivity is strong.

The technical solution of utility model is as follows:

A kind of bandpass filter with multiple film layer structure comprises substrate and a plurality of Ta2O5 retes and a plurality of low-index film that are laminated on the substrate, a plurality of Ta ₂O ₅Rete and a plurality of SiO ₂Rete is arranged alternately successively; Ta ₂O ₅Rete is 38 layers, SiO ₂Rete is 37 layers.

Described being arranged alternately refers to according to one deck Ta ₂O ₅Rete, one deck SiO ₂Rete, one deck Ta ₂O ₅Rete, one deck SiO ₂Rete ... set gradually, as shown in Figure 1.

Beneficial effect:

Bandpass filter with multiple film layer structure of the present utility model, film layer structure by a plurality of high refractive index layers and a plurality of low-index films realizes that the selectivity of different wave length passes through, this have the bandpass filter of multiple film layer structure based on the interference of light principle, mutual interference by two-beam light, so that lengthen in that the position of the wavelength of required (being pre-selected) is relevant, weaken and the wavelength that does not need is relevant, realize high transmission rate and strong light selecting performance energy.

By increasing the number of plies of rete, increase its cut-off degree of depth to reach, improve isolation, by the Thickness Design of rete, improve control accuracy, thereby improve its transmittance, reduce its loss, increase the cut-off degree of depth to reach, improve the raising of excessively following transmittance with slope, the cut-off degree of depth, also can improve product percent of pass.

Bandpass filter with multiple film layer structure of the present utility model allows the light of 1490nm wavelength pass through, and allows the light with 1310nm and 1550nm wavelength isolate.

Description of drawings

Fig. 1 is the general structure synoptic diagram with bandpass filter of multiple film layer structure of the present utility model.

Label declaration: 1-substrate, 22-Ta ₂O ₅Rete, 21-SiO ₂Rete.

Embodiment

Below with reference to the drawings and specific embodiments the utility model is described in further details:

Embodiment 1:

As shown in Figure 1, a kind of bandpass filter with multiple film layer structure comprises substrate and a plurality of Ta2O5 retes and a plurality of low-index film that are laminated on the substrate, a plurality of Ta ₂O ₅Rete and a plurality of SiO ₂Rete is arranged alternately successively; Ta ₂O ₅Rete is 38 layers.SiO ₂Rete is 37 layers.

The light control film system (from top to bottom) of each rete is as follows:

1.504H;0.770L;1.000H;1.000L;2.000H;1.000L;1.000H;1.000L;1.000H;1.000L;

1.000H;1.000L;1.000H;1000L；.000H;1.000L;1.000H;1.000L;1.000H;1.000L;

1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;2.000H;1.000L;1.000H;1.000L;

1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;4.000H;1.000L;

1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;

2.000H;?.000L;1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;

1.000H;1.000L;2.000H;1.000L;1.000H;1.000L;1.000H;1.000L;1.000H;1.000L;

1.000H;1.000L;2.000H;1.000L;1.000H.

Wherein H and L distinguish corresponding Ta ₂O ₅Rete (high-index material) and SiO ₂Rete (low-index material), Ta ₂O ₅The refractive index Hn=2.15 that rete is corresponding, SiO ₂The refractive index Ln=1.45. that rete is corresponding

1H, 1L represent respectively 1 1/4 wavelength optical thickness of high-index material and low-index material.

In this example, wavelength X is 1490nm, and 1H=λ/4Hn=1490/4*2.15 nm is then arranged;

1L=λ/4Ln=1490/4*1.45?nm。

Claims (1)

1. the bandpass filter with multiple film layer structure is characterized in that, comprises substrate and a plurality of Ta2O5 retes and a plurality of low-index film that are laminated on the substrate, a plurality of Ta ₂O ₅Rete and a plurality of SiO ₂Rete is arranged alternately successively; Ta ₂O ₅Rete is 38 layers, SiO ₂Rete is 37 layers.

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