CN201757797U

CN201757797U - Single-fiber and double-direction optical transceiver module optical element for SFP+

Info

Publication number: CN201757797U
Application number: CN2010202176231U
Authority: CN
Inventors: 李伟龙; 孙雨舟; 施高鸿; 刘圣
Original assignee: Innolight Technology Suzhou Ltd
Current assignee: Innolight Technology Suzhou Ltd
Priority date: 2010-06-07
Filing date: 2010-06-07
Publication date: 2011-03-09
Anticipated expiration: 2020-06-07

Abstract

The utility model provides a single-fiber and double-direction optical transceiver module optical element for SFP+, comprising a transmitting terminal, a receiving terminal and an optical lens assembly, wherein the transmitting terminal and the receiving terminal are arranged side by side in parallel; the optical lens assembly comprises a first filter plate, a second filter plate and a prism; an LC-type connector is arranged on the transmitting terminal; the first filter plate is arranged between the transmitting terminal and the LC-type connector; the angle between the first filter plate and the incident light direction is 45 DEG; an optical isolator is arranged between the transmitting terminal and the first filter plate; the second filter plate is arranged between the first filter plate and the receiving terminal, and the prism is arranged between the first filter plate and the second filter plate. The single-fiber and double-direction optical transceiver module optical element for SFP+ of the utility model meets the standards of the single-fiber and double-direction optical transceiver module optical element for SFP+ well on the main performances of transmission rate, light power, sensitivity and the lie, and is compatible with an SFP+ standard module in shape.

Description

The single fiber bi-directional optical transceiver module optical assembly that is used for SFP+

Technical field

The utility model relates to the single fiber bi-directional optical transceiver module in the optical communication technique, relates in particular to the single fiber bi-directional optical transceiver module optical assembly of a kind of SFP+ of being used for.

Background technology

Communication network was extensively popularized in the past in 20 years, global traffic has obtained immense success, along with the rapid expansion in mobile communication market, communication network is faced with provides faster transfer rate, prolong more in short-term, more high frequency band and the more active demand of low running cost.Existing 3G can't satisfy the numerous and jumbled demand in user and market, and TD-LTE (Time Division-Long Term Evolution, the Long Term Evolution of TD-SCDMA) arises at the historic moment as the march toward technology of 4G of 3G.Because the fiber resource anxiety is newly laid the expense height at present, and the base station distribution distance is far away, and the demand of the single fiber bi-directional optical transceiver module of SFP (SFP+) encapsulation progressively increases.But traditional single fiber bi-directional modular construction size is bigger than normal, produce with the encapsulation of the small size of SFP+ and conflict, and the legacy transmission end is vertical with receiving end places, and being connected electrical stability with the back-end circuit plate can be poor.

The principle of traditional single fiber bi-directional assembly as shown in Figure 1a, light enters the optical frames group by optical fiber, in the optical frames group, first filter plate 31 is miter angle with light path, light path is wave plate generation total reflection after filtration, afterwards again through 32 filtering of second filter plate, enter receiving end 2 through 90 degree total reflections then.Receiving end 2 adopts the PIN-TIA assembly, and PIN is a kind of photo-detector, is used for opto-electronic conversion, and TIA is trans-impedance amplifier (Trans Impedance Amplifier).Transmitting terminal 1 light path enters optical fiber through 45 degree filter plates.Transmitting terminal uses the ball-type lens to focus on, and coupling efficiency is low.Transmitting terminal is vertical placement with receiving end, can not satisfy the high-speed transfer performance.

The SFP+ module size of standard is shown in Fig. 1 b, and its shell sizes is 13.55mm ± 0.25mm.Traditional single fiber bi-directional length component direction size is bigger, and the I weld size that back and circuit board are installed produces and conflicts, so is difficult for the module package at SFP+.

Number of patent application is that 200710073305.5 Chinese patent discloses photoelectric receiver-transmitter integrated module assembly of mono-optical fibre two-way, comprise transmitting terminal, receiving end, optical frames group, described transmitting terminal and receiving end be arranged in parallel side by side, described optical frames group comprises the first total reflection slide and the second total reflection slide, described first total reflection slide and the parallel placement of the second total reflection slide are used for input path is directed into described receiving end.Reflected light has harmful effect to the light source light spectrum output power stability, influences the high-speed transfer performance, can not satisfy the requirement of SFP+ single fiber bi-directional optical transceiver module optical assembly up-high speed transmission performance; Receiving end light path total optical path is longer, and receiving end sensitivity is lower, influences the high-speed transfer performance, can not satisfy the requirement of SFP+ single fiber bi-directional optical transceiver module optical assembly down high speed transmission performance; In addition, condenser lens is arranged between the first total reflection slide and the second total reflection slide, can not well locate in the actual production, can not satisfy requirements of mass production.Transmitting terminal uses the ball-type lens to focus on, and coupling efficiency is low.

The utility model content

The purpose of this utility model is to overcome the deficiency that prior art exists, a kind of single fiber bi-directional optical transceiver module optical assembly of the SFP+ of satisfying application requirements is provided, be intended to solve traditional single fiber bi-directional size of components big, with the problem that the small size encapsulation of SFP+ conflicts, the small size that better adapts to SFP+ encapsulates.

The purpose of this utility model is achieved through the following technical solutions:

The single fiber bi-directional optical transceiver module optical assembly that is used for SFP+, comprise transmitting terminal, receiving end and optical frames group, described transmitting terminal and the parallel side by side placement of receiving end, characteristics are: described optical frames group comprises first filter plate, second filter plate and prism, LC type connector places transmitting terminal, between transmitting terminal and LC type connector, arrange first filter plate, first filter plate and incident light direction are miter angle, between first filter plate and receiving end, place second filter plate, and between first filter plate and second filter plate, prism is set.

Further, the above-mentioned single fiber bi-directional optical transceiver module optical assembly that is used for SFP+ wherein, is furnished with optoisolator between the described transmitting terminal and first filter plate.

Further, the above-mentioned single fiber bi-directional optical transceiver module optical assembly that is used for SFP+ wherein, is furnished with condenser lens between the described prism and second filter plate.

The substantive distinguishing features of technical solutions of the utility model and progressive being mainly reflected in:

1. the utility model transmitting terminal and the parallel side by side placement of receiving end are compared with traditional vertical placement, and it is connected convenient with the circuit board of rear end, increased electrical stability, and web joint length is short, helps high-frequency signal transmission;

2. be more suitable for compact package, compare with traditional design, total length has lacked 2 millimeter, gives the bigger space of board design; The light transmitting terminal is identical with receiving end length, is connected more stable with the rear end;

3. the receiving end light path is not subjected to the influence of coma, and receiving end sensitivity is higher; Greatly improved the coupling efficiency of transmitting terminal light path, the scale error tolerance limit is big, is more suitable for producing in batches.

Description of drawings

Below in conjunction with accompanying drawing technical solutions of the utility model are described further:

Fig. 1 a: the light path principle figure of traditional single fiber bi-directional assembly;

Fig. 1 b: standard SFP+ package dimension figure;

Fig. 2: external structure of the present utility model;

Fig. 3 a: light path principle figure of the present utility model;

Fig. 3 b: receiving end focal beam spot figure of the present utility model;

Fig. 4 a: the light path principle figure that does not use prism;

Fig. 4 b: the receiving end focal beam spot figure that does not use prism.

The implication of each Reference numeral sees the following form among the figure:

Reference numeral

Implication

Reference numeral

Implication

Reference numeral

Implication

1

Transmitting terminal

2

Receiving end

3

The optical frames group

31

First filter plate

32

Second filter plate

33

Optoisolator

34

Condenser lens

35

Prism

36

The 3rd filter plate

4

LC type connector

Embodiment

Embodiment:

Be used for SFP+ single fiber bi-directional optical transceiver module optical assembly structure as shown in Figure 2, comprise transmitting terminal 1, receiving end 2, optical frames group 3 and LC type connector 4, transmitting terminal 1 and the parallel side by side placement of receiving end 2, its light path principle is shown in Fig. 3 a, the optical frames group comprises first filter plate 31, second filter plate 32, optoisolator 33 and prism 35, LC type connector 4 places transmitting terminal, arrange that between transmitting terminal 1 and LC type connector 4 first filter plate, 31, the first filter plates 31 are miter angle with the incident light direction; Between the transmitting terminal 1 and first filter plate 31, be furnished with optoisolator 33; Between first filter plate 31 and receiving end 2, place second filter plate 32, and between first filter plate 31 and second filter plate 32, prism 35 is set, be furnished with condenser lens 34 between the prism 35 and second filter plate 32.

Transmitting terminal 1 comprises the standard TO48 encapsulation of Distributed Feedback Laser and one group of non-spherical lens, and receiving end 2 comprises the standard TO48 encapsulation of PIN-TIA assembly and flat glass mirror.During emission, the light path of transmitting terminal sees through optoisolator 33, enters LC type connector 4 through first filter plate 31 again; During reception, outer light source is by LC type connector 4 directives first filter plate 31, and light path through first filter plate 31 90 degree deflections takes place, through prism 35 90 degree deflections take place again, enter condenser lens 34 then and focus on,, receive by receiving end 2 then by 32 filtering of second filter plate.

Its focal beam spot shape is shown in Fig. 3 b.

Comparative example:

Fig. 4 a is depicted as the light path principle that does not use prism, between first filter plate 31 and second filter plate 32 the 3rd filter plate 36 is set, and replaces prism by filter plate, and 90 degree deflections take place when making light path through the 3rd filter plate 36.Said structure also can be realized single fiber bi-directional optical transceiver module function.Its focal beam spot shape is shown in Fig. 4 b.

From Fig. 4 b and Fig. 3 b as can be seen, do not use prism 35 to make that receiving end light path total optical path is elongated, light path is subjected to the aberration influence and becomes big, light path focusing effect variation, the focal beam spot disperse, system receiving terminal sensitivity descends, and influences the high-speed transfer performance, can not satisfy the requirement of SFP+ single fiber bi-directional optical transceiver module optical assembly down high speed transmission performance.

The utility model has shortened receiving end light path total optical path greatly by add prism 35 in the optical frames group, the sensitivity that has improved receiving end greatly, and guaranteeing to make under the unobstructed situation of light path that transmitting terminal and receiving end can parallel side by side placements; Satisfying under the prerequisite of performance requirement, making the single fiber bi-directional modular construction diminish, satisfying the SFP+ structure of standard on the size fully, adapting to the requirement of SFP+ miniaturization encapsulation.

Optoisolator 33 is set, reduces the harmful effect of reflected light greatly, improve the high-speed transfer performance the light source light spectrum output power stability.

Place condenser lens between the prism 35 and second filter plate 32, light path is focused on, the luminous power that makes receiving end receive increases, thereby can improve the sensitivity of reception, makes the utility model can satisfy the requirement of SFP+ down high speed transmission performance.Important parameters such as receiving end sensitivity of the present utility model, transmitting terminal luminous power are more excellent than traditional structure.

Transmitting terminal uses non-spherical lens, when light path is focused on, and the coupling efficiency of very big increase transmitting terminal, thus can improve laser optical power, satisfy the requirement of SFP+ up-high speed transmission performance.

First filter plate 31 is miter angle with input path to be placed, and makes and the total reflection of optical fiber input light path generation an angle of 90 degrees realizes the single fiber bi-directional transmission.90 degree deflections take place in first filter plate of placing through miter angle by design receiving end light path, have avoided the influence of coma to receiving end, thereby have improved receiving end sensitivity.

In sum, the utility model has designed the single fiber bi-directional optical transceiver module optical assembly of a kind of SFP+ of being used for, be used for the transmitting terminal light path is imported output terminal and input path is imported receiving end, this single fiber bi-directional symmetrical beam transceiver module assembly can better satisfy the single fiber bi-directional optical transceiver module standard of SFP+ on main performances such as transfer rate, luminous power, sensitivity, on external form with SFP+ standard module compatibility.

What need understand is: the above only is a preferred implementation of the present utility model; for those skilled in the art; under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection domain of the present utility model.

Claims

1. the single fiber bi-directional optical transceiver module optical assembly that is used for SFP+, comprise transmitting terminal, receiving end and optical frames group, described transmitting terminal and the parallel side by side placement of receiving end, it is characterized in that: described optical frames group comprises first filter plate, second filter plate and prism, LC type connector places transmitting terminal, between transmitting terminal and LC type connector, arrange first filter plate, first filter plate and incident light direction are miter angle, between first filter plate and receiving end, place second filter plate, and between first filter plate and second filter plate, prism is set.

2. the single fiber bi-directional optical transceiver module optical assembly that is used for SFP+ according to claim 1 is characterized in that: be furnished with optoisolator between the described transmitting terminal and first filter plate.

3. the single fiber bi-directional optical transceiver module optical assembly that is used for SFP+ according to claim 1 is characterized in that: be furnished with condenser lens between the described prism and second filter plate.