CN2522900Y

CN2522900Y - Optoioslator

Info

Publication number: CN2522900Y
Application number: CN 01258682
Authority: CN
Inventors: 邓兆展; 李俊佑
Original assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Current assignee: Hongfujin Precision Industry Shenzhen Co Ltd; Hon Hai Precision Industry Co Ltd
Priority date: 2001-12-15
Filing date: 2001-12-15
Publication date: 2002-11-27
Anticipated expiration: 2011-12-15

Abstract

An optical isolator consists essentially of two optical fiber collimating units and an isolation center positioned between the two optical fiber collimating units, wherein, the optical fiber collimating unit consists of a contact pin with an optical fiber and a focusing lens, while the isolation center consists of a first birefringent crystal, a magneto-optical crystal and a second birefringent crystal; the first and the second birefringent crystals are wedge-shaped and paste on the focusing lens of the two collimating units in parallel respectively; the isolation center further comprises of two beam displacement devices which are pasted along the two sides of the magneto-optical crystal respectively and are sleeved into a magnetic ring together.

Description

Optoisolator

[technical field]

The utility model relates to a kind of optoisolator, particularly relates to a kind of optical communication system that is applied to, and is used for isolating the optoisolator of return light may signal, its have low insertion loss, high-isolation and assemble convenient.

[background technology]

Because light signal can pass through a plurality of different optical interfaces when transmitting in optical communication system, and reflection in various degree all can occur at each optical interface place, the return light may that reflection produces may be passed light source back along original optical path.When the return light may accumulation acquires a certain degree, can cause the light source works instability, produce problems such as frequency drift, thereby influence the total system operate as normal.Therefore, in order to ensure the work quality of optical communication system, the influence that the employing optoisolator is eliminated return light may in the fibre circuit is very necessary.

A kind of existing optoisolator can be consulted United States Patent (USP) the 5th, 446, and No. 813 (Fig. 1 reference), this optoisolator 100 comprises that first, second collimator apparatus 110,120 and one places the quarantine center 130 between first, second collimator apparatus 110,120.This quarantine center 130 comprises first, second birefringece crystal 131,132 and places therebetween a magneto-optical crystal 133, this first, second birefringece crystal 131,132 and magneto-optical crystal 133 by viscose glue in conjunction with after be fixed in the magnet ring 134.During assembling, need to detect the overall performance of quarantine center 130,, then itself and first, second collimator apparatus 110,120 are assembled optoisolator 100 if meet pre-provisioning request.

Please cooperate and consult Fig. 2, during work, from the light signal of first collimator apparatus 110 when the A direction sees through first birefringece crystal 131, birefringent phenomenon takes place, be divided into orthogonal o light of plane of polarization and e light, and its transmission direction is owing to refraction effect departs from incident light axis, magneto-optical crystal 133 makes o light and e polarization surface rotate a special angle (as 45 degree) subsequently, and make its transmission direction that deviation take place once more, further widen distance with incident light axis, the optical axis included angle adjustment of the optical axis of second birefringece crystal 132 and first birefringece crystal 131 is this special angle (as 45 degree), make o light and e light be pooled the light beam that is parallel to incident direction, and be transferred to second collimator apparatus 120 by its inner back.Yet, there are big side-play amount D in the axis of this light beam and incident light axis, and (when birefringece crystal adopts lithium niobate material, the angle of wedge is 13 when spending, D is about 1550nm), make second collimator apparatus 120 need lateral excursion optical axis distance D can receive this light beam and make it focus to output optical fibre (not indicating), to make that so second collimator apparatus 120 needs to regulate in a big way in, so that the aligning of itself and quarantine center 130 expends man-hour.Again, the assembling of this optoisolator 100 need be experienced twice and detect operation, i.e. the detection of quarantine center 130 and optoisolator 100 optical properties so will expend man-hour, reduce production capacity.

In addition, quarantine center's 130 each assembly of this optoisolator 100 are by the viscose glue combination, make and regulate first, second birefringece crystal 131,132 optical axis included angle is difficulty very, if misoperation, cause quarantine center's 130 each assembly relative position to occur than large deviation, then because each assembly by the viscose glue combination, be difficult for splitting, so that can't go adjustment first again, second birefringece crystal 131,132 angle and position and cause its isolation lower, and because viscose glue poor heat stability, be subjected to influence of temperature change easily, can produce the glue phenomenon of overflowing in the baking processing procedure, thereby pollute first, second birefringece crystal 131,132 and magneto-optical crystal 133, so that increase and insert loss, the overall performance of optoisolator 100 reduced.

[technology contents]

The purpose of this utility model is to provide the optoisolator that a kind of birefringece crystal optical axis included angle is accurately adjustable, assembling is convenient and collimator apparatus and quarantine center can accurately aim at.

In order to achieve the above object, the utility model optoisolator mainly comprises first, second fiber optic collimator device and places a quarantine center between this two fiber optic collimators device.Wherein, this fiber optic collimator device comprises that one has the contact pin and a condenser lens of optical fiber, this quarantine center comprises that first birefringece crystal, is sleeved on the magneto-optical crystal and second birefringece crystal in the magnet ring, this first, second birefringece crystal is wedge shape, and smooth respectively on the condenser lens of this first, second collimator apparatus, this quarantine center further comprises at least one pattern displacement device.

Compared with prior art, in the utility model optoisolator, because first, second birefringece crystal is close to first condenser lens, second condenser lens respectively, when making the relative position of first, second collimator apparatus of adjustment and angle, can regulate the optical axis included angle of first, second birefringece crystal simultaneously, thereby accurately locate this first, second birefringece crystal, and can omit the operation that detects quarantine center's performance, make that assembling is convenient, and improve the isolation of optoisolator.In addition, by adopting the pattern displacement device, can effectively eliminate the lateral excursion of emergent light and incident light, be convenient to the aligning of second collimator apparatus and quarantine center, promptly punctual fine setting second collimator apparatus that only needs is got final product, thereby reduce work hours, and reduce and insert loss, improve the whole optical property of optoisolator.

[description of drawings]

Fig. 1 is the sectional view of existing optoisolator.

Fig. 2 is the index path of existing optoisolator quarantine center.

Fig. 3 is the sectional view of the utility model first embodiment optoisolator.

Fig. 4, Fig. 5 are quarantine center's index paths of the utility model first embodiment.

Fig. 6 is quarantine center's index path of the utility model second embodiment.

[embodiment]

Please refer to Fig. 3, the utility model first embodiment optoisolator 10 mainly comprises first collimator apparatus 20, second collimator apparatus 40 and places a quarantine center 30 between first,

second collimator apparatus

20,40.

Wherein, this first collimator apparatus 20 comprises and has optical fiber first contact pin 22, first condenser lens 23 and a sleeve pipe 24 of (indicating); this sleeve pipe 24 adopts glass or other material to make; protect this first contact pin 22 and first condenser lens 23 in order to suit, and first condenser lens 23 partly stretches out sleeve pipe 24.In order to protect collimator apparatus 20, a further sheathed metal sleeve 25 on sleeve pipe 24, the equal in length of its length and sleeve pipe 24.This second collimator apparatus 40 is identical with first collimator apparatus, 20 structures, comprises second condenser lens 43.

This quarantine center 30 comprises first birefringece crystal 31, a magneto-optical crystal 32 and second birefringece crystal 33.Wherein, this first,

second birefringece crystal

31,33 is wedge shape, and its plane is close to first condenser lens 23, second condenser lens 43 respectively.The specific rotation angle of these magneto-optical crystal 32 tools, its cross section along optical transmission direction is roughly rectangular, and its both sides are pasted a pattern displacement device 34 respectively and are placed in the magnet ring 35.These magnet ring 35 two ends further are set with the end that first condenser lens 23 and second condenser lens 43 stretch out sleeve pipe.

This pattern displacement device 34 is roughly a cumeat, and light beam will reflect by its inside, exists a side-play amount, this characteristic to can be used to adjust the transmission direction (detailed aftermentioned) of irradiating light beam between the axis of emergent light and incident light.

During assembling, regulate first,

second collimator apparatus

20,40 to aim at optical axis, adjust the optical axis included angle of first,

second birefringece crystal

31,33 simultaneously, thereby the insertion consume and the isolation of optimization optoisolator 10, each assembly of relative positioning afterwards, and utilize fastening assembly 50 suit fixings this first,

second collimator apparatus

20,40 and magnet ring 35, this fastening assembly 50 is made for metal material, roughly be cylindric, all offer a plurality of welding holes 51 near its two ends, for welding the usefulness of fixing first,

second collimator apparatus

20,40.

Please cooperate with reference to figure 4 and Fig. 5, be quarantine center's index path of the utility model first embodiment.During forward transmitted, incident light is via first condenser lens, 23 collimation back vertical incidence to the first birefringece crystals 31, be divided into orthogonal o light of plane of polarization and e light, and the downward deviation of the relative incident direction of its transmission direction, plane of polarization changes when this o light and e light transmission pattern displacement device 34 and magneto-optical crystal 32, and the relative incident direction of the transmission direction deviation that makes progress, during outgoing, downward deviation takes place in its transmission direction once more, make the o light of arrival second birefringece crystal 33 and the axis of e light be positioned near the incident light axis, this second birefringece crystal 33 makes the transmission direction through its inner o light and e light be parallel to incident direction, and because the deviation of 34 pairs of light beams of horizontal light beam shifter, make only there is a minimum transversal displacement between this beam axis and the incident light axis that this light beam enters second condenser lens 43 subsequently and converges to output optical fibre (not indicating).

During reverse transfer, because the nonreciprocity of magneto-optical crystal 32 makes can't converge to the return light may that reflects from second birefringece crystal 33 first collimator apparatus 20 through first birefringece crystal 31, thereby realize isolating the effect of return light may.

With reference to Fig. 6, it is quarantine center's index path of the utility model second embodiment, quarantine center's 30 structures of this quarantine center 30 ' and first embodiment are roughly similar, yet, this quarantine center 30 ' only adopts a pattern displacement device 34 ', this pattern displacement device 34 ' and magneto-optical crystal 32 are set in the magnet ring 35 (as shown in Figure 3) together, it is parallelogram roughly along the cross section of optical transmission direction, because the deviation direction and first that it produces light beam, second birefringece crystal 31, the 32 deviation directions that light beam is produced are opposite, thereby can reduce the lateral excursion of emergent light and incident light.

In addition, this pattern displacement device also can adopt other shape, only need guarantee that its deviation direction and birefringece crystal that light beam is produced gets final product the deviation direction of light beam generation on the contrary.Again, also can not adopt the pattern displacement device, the magneto-optical crystal that selective refraction rate and shape meet pre-provisioning request also is feasible.

Claims

1. optoisolator, comprise first collimator apparatus, second collimator apparatus and the quarantine center between this first, second collimator apparatus, this first, second collimator apparatus includes a contact pin and the condenser lens with optical fiber, this quarantine center comprises first birefringece crystal, second birefringece crystal and therebetween and be set in magneto-optical crystal in the magnet ring, and it is characterized in that: this quarantine center further comprises at least one pattern displacement device.

2. optoisolator as claimed in claim 1 is characterized in that: this birefringece crystal is wedge shape, and vertical plane is close to corresponding condenser lens is parallel.

3. optoisolator as claimed in claim 2 is characterized in that: the end of at least one condenser lens is sheathed in the magnet ring.

4. optoisolator as claimed in claim 1 is characterized in that: this pattern displacement device quantity is two, and it places the magneto-optical crystal both sides respectively.

5. optoisolator as claimed in claim 4 is characterized in that: this two pattern displacements device is a cumeat.

6. optoisolator as claimed in claim 5 is characterized in that: this two pattern displacements device is pasted on the magneto-optical crystal both sides respectively, and is sleeved in the magnet ring together.

7. optoisolator as claimed in claim 1 is characterized in that: this pattern displacement device quantity is one, and it places between a magneto-optical crystal and the birefringece crystal.

8. optoisolator as claimed in claim 7 is characterized in that: this pattern displacement device cross section is parallelogram roughly.

9. optoisolator as claimed in claim 7 is characterized in that: this pattern displacement device and magneto-optical crystal are sleeved in the magnet ring together.

10. optoisolator as claimed in claim 1 is characterized in that: this at least one pattern displacement device and magneto-optical crystal are one, and its cross section parallelogram roughly.