CN201757796U

CN201757796U - Single-fiber and double-direction symmetrical optical transceiver module optical element for 10G-EPON

Info

Publication number: CN201757796U
Application number: CN2010202175116U
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 relates to a single-fiber and double-direction symmetrical optical transceiver module optical element for 10G-EPON, 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 prism, a second prism, a first filter plate and a second filter plate; an SC-type connector is arranged at a symmetrical position of the transmitting terminal and the receiving terminal; the first filter plate is arranged between the transmitting terminal and the SC-type connector; an angle between the first filter plate and the incident light direction is 45 DEG; the first prism is arranged between the first filter plate and the transmitting terminal; the second filter plate is arranged between the first filter plate and the transmitting terminal; and the second prism is arranged between the second filter plate and the first filter plate. The single-fiber and double-direction symmetrical optical transceiver module optical element of the utility model can meet the standards of 10G-EPON well on main performances of output light power, sensitivity and the like, and is compatible with an SFP+ standard module in shape.

Description

The single fiber bi-directional symmetrical beam transceiver module optical assembly that is used for 10G-EPON

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 symmetrical beam transceiver module optical assembly of a kind of 10G-EPON of being used for.

Background technology

The application of fiber optic network at present is more and more universal, and the FTTH (Fiber ToThe Home, Fiber to the home) of optical fiber access all over the world project is progressively implemented.EPON technology as one of main access technology of FTTH is based on directly development of ethernet technology, can seamlessly merge mutually with IPization, ether networking trend, its extensibility is good, relative other optical-fiber network access technologies of characteristics such as technology is simple, and the realization multicast is convenient more are subjected to people's favor.Demand for the single fiber bi-directional assembly of SFP (SFP+) encapsulation also progressively increases thereupon.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 33 is miter angle with light path, light path is wave plate generation total reflection after filtration, afterwards again through 34 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 10G-EPON single fiber bi-directional symmetrical beam transceiver module optical assembly up-high speed transmission performance; Because 10G-EPON requires the SC type connector size of use bigger, can not satisfy the SFP+ module package; Transmitting terminal uses the ball-type lens to focus on, coupling efficiency is low, can not satisfy the requirement of 10G-EPON to Output optical power, if use the standard TO48 encapsulation of Distributed Feedback Laser and one group of non-spherical lens, then single fiber bi-directional assembly transmitting terminal lengthwise dimension is bigger, the I weld size generation that back and circuit board are installed conflicts, and is difficult for the module package at SFP+.

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 symmetrical beam transceiver module optical assembly of the 10G-EPON of satisfying application requirements is provided, effectively solve traditional single fiber bi-directional size of components deficiency big, that conflict with the small size encapsulation of SFP+, thereby well adapt to the small size encapsulation of SFP+.

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

The single fiber bi-directional symmetrical beam transceiver module optical assembly that is used for 10G-EPON, 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 prism, second prism, first filter plate and second filter plate, SC type connector places the symmetric position of transmitting terminal and receiving end, between transmitting terminal and SC type connector, arrange first filter plate, first filter plate and incident light direction are miter angle, and arrange first prism between first filter plate and transmitting terminal; Arrange second filter plate between first filter plate and the receiving end, and between second filter plate and first filter plate, second prism is set.

Further, the above-mentioned single fiber bi-directional symmetrical beam transceiver module optical assembly that is used for 10G-EPON wherein, is furnished with optoisolator between the described transmitting terminal and first prism.

Further, the above-mentioned single fiber bi-directional symmetrical beam transceiver module optical assembly that is used for 10G-EPON wherein, is furnished with condenser lens between described second prism and second filter plate.

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

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; In addition, 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; The transmitting terminal light path is not subjected to the influence of coma, the coupling efficiency height; The coupling efficiency of transmitting terminal light path is up to 60%, and 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 first prism and second prism;

Fig. 4 b: the receiving end focal beam spot figure that does not use second 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 prism	32	Second prism	33	First filter plate
						34	Second filter plate	35	Optoisolator	36	Condenser lens
37	The 3rd filter plate	38	The 4th filter plate	39	The 5th filter plate

Reference numeral

Implication

Reference numeral

Implication

Reference numeral

Implication

4

SC type connector

Embodiment

Embodiment:

Be used for 10G-EPON single fiber bi-directional symmetrical beam transceiver module optical assembly structure as shown in Figure 2, comprise transmitting terminal 1, receiving end 2, optical frames group and SC type connector, transmitting terminal 1 and the parallel side by side placement of receiving end 2, its light path principle is shown in Fig. 3 a, optical frames group 3 comprises first prism 31, second prism 32, first filter plate 33 and second filter plate 34, SC type connector 4 places the symmetric position of transmitting terminal 1 and receiving end 2, between transmitting terminal 1 and SC type connector 4, arrange first filter plate 33, first filter plate 33 is miter angle with the incident light direction, and between first filter plate 33 and transmitting terminal 1, arrange first prism 31, and be furnished with optoisolator 35 between first prism 31 and the transmitting terminal 1; Arrange second filter plate 34 between first filter plate 33 and the receiving end 2, and between second filter plate 34 and first filter plate 33, second prism 32 is set, and be furnished with condenser lens 36 between second prism 32 and second filter plate 34.

Transmitting terminal 1 comprises the standard TO48 encapsulation of Distributed Feedback Laser and one group of non-spherical lens.Receiving end 2 comprises the standard TO48 encapsulation of APD receiver and flat glass mirror.During emission, 90 degree deflections take place through first prism 31 after seeing through optoisolator 35 in the light path of transmitting terminal, through first filter plate 33 90 degree deflections take place again and enter SC type connector 4; During reception, outer light source enters condenser lens 36 through second prism 32 again through first filter plate 33 and focuses on by SC type connector 4 directives first filter plate 33, then by 34 filtering of second filter plate, is received by receiver 2.

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 first prism and second prism, the 3rd filter plate 37 is set between first filter plate 33 and optoisolator 35, the 4th filter plate 38 and the 5th filter plate 39 are set between first filter plate 33 and second filter plate 34, the 3rd filter plate 37 replaces first prism 31, and 90 degree deflections take place when making light path through the 3rd filter plate 37; And replace second prism 32 with the 4th filter plate 38 and the 5th filter plate 39,90 degree deflections take place when making light path through the 4th filter plate 38,90 degree deflections take place through the 5th filter plate 39.Said structure also can be realized single fiber bi-directional symmetrical beam transceiver module function, but transmitting terminal 1 is very approaching with optoisolator 35 distances, optoisolator 35 fail to reach good light isolation effect, reflected light has harmful effect to the light source light spectrum output power stability, influence the high-speed transfer performance, make and to satisfy 10G-EPON the requirement of single fiber bi-directional symmetrical beam transceiver module optical assembly up-high speed transmission performance.

Do not use its focal beam spot shape of second prism shown in Fig. 4 b, do not use the disperse that becomes of the second prism focal beam spot, most of light can not be received by the APD detector, causes system's receiving sensitivity to descend, and can not satisfy the requirement of 10G-EPON down high speed transmission performance.

The utility model is guaranteeing to make under the unobstructed situation of light path the parallel side by side placement of transmitting terminal 1 and receiving end 2 by first prism 31 and second prism 32 are set in the optical frames group; Under the performance requirement prerequisite that satisfies the high Output optical power of 10G-EPON, high receiving sensitivity, make the single fiber bi-directional modular construction diminish, satisfy the SFP+ structure of standard on the size fully; And make 10G-EPON require the SC type connector of use to place the symmetrical width position of single fiber bi-directional symmetrical beam transceiver module optical assembly, adapt to the requirement of SFP+ miniaturization encapsulation.

Between second prism 32 and second filter plate 34, place condenser lens 36, 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 10G-EPON down high speed transmission performance.Important parameters such as receiving end sensitivity, transmitting terminal luminous power are more excellent than traditional structure.

Optoisolator 35 is set, reduces the harmful effect of reflected light greatly, improve the high-speed transfer performance the light source light spectrum output power stability.

First filter plate 33 is miter angle with input path to be placed, and can make the total reflection of input path generation an angle of 90 degrees, realizes the single fiber bi-directional transmission.90 degree deflections take place in first filter plate that the output terminal light path is placed through miter angle, have avoided the influence of coma to output terminal, thereby have improved output terminal efficient.

Use non-spherical lens at transmitting terminal, when light path is focused on, the coupling efficiency of very big increase transmitting terminal, thus improve laser optical power, satisfy the requirement of 10G-EPON up-high speed transmission performance.

In sum, the utility model is designed for 10G-EPON (Ethernet Passive OpticalNetwork, ethernet passive optical network) single fiber bi-directional symmetrical beam transceiver module optical assembly, compare with traditional single fiber bi-directional optical transceiver module optical assembly, has higher transmitting terminal coupling efficiency, higher receiving end sensitivity, volume is little, the reliability height, compatible high, single fiber bi-directional symmetrical beam transceiver module optical assembly of the present utility model is at Output optical power, better satisfy the 10G-EPON standard on the main performances such as 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 symmetrical beam transceiver module optical assembly that is used for 10G-EPON, 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 prism, second prism, first filter plate and second filter plate, SC type connector places the symmetric position of transmitting terminal and receiving end, between transmitting terminal and SC type connector, arrange first filter plate, first filter plate and incident light direction are miter angle, and arrange first prism between first filter plate and transmitting terminal; Arrange second filter plate between first filter plate and the receiving end, and between second filter plate and first filter plate, second prism is set.

2. the single fiber bi-directional symmetrical beam transceiver module optical assembly that is used for 10G-EPON according to claim 1 is characterized in that: be furnished with optoisolator between the described transmitting terminal and first prism.

3. the single fiber bi-directional symmetrical beam transceiver module optical assembly that is used for 10G-EPON according to claim 1 is characterized in that: be furnished with condenser lens between described second prism and second filter plate.