CN205450361U

CN205450361U - Two FWDM receiving and dispatching structures of high isolation

Info

Publication number: CN205450361U
Application number: CN201620128827.5U
Authority: CN
Inventors: 张才生; 罗友泉
Original assignee: Xiamen Bely Communication Equipment Co ltd
Current assignee: Xiamen Bely Communication Equipment Co ltd
Priority date: 2016-02-19
Filing date: 2016-02-19
Publication date: 2016-08-10
Anticipated expiration: 2026-02-19

Abstract

The utility model relates to an optical fiber communication field discloses a two FWDM receiving and dispatching structures of high isolation, including first order FWDM optical components, second level FWDM optical components, first order FWDM optical components's reflection end and second level FWDM optical components's input pass through the sealing bar butt fusion together, first order FWDM optical components throw end coupling photoelectricity second grade receiver tube, second level FWDM optical components throw end coupling photoelectricity diode luminescence pipe, its characterized in that: first order FWDM optical components in include first order four -core optical fiber head, a glens collimater, single 1550 7.5nm diaphragms, the 2nd glens collimater of passing through that sets gradually along the light path, second level FWDM optical components in include second level four -core optical fiber head, the 3rd glens collimater, single 1610 7.5nm diaphragms, the fourth glens collimater of passing through that sets gradually along the light path. The utility model discloses successful improvement CWDM filter element reflection isolation have only 15dB's bottleneck, use conventional filter element to realize high isolation's demand, make the leading -in production that the product can be faster, solved the biggest problem with minimum cost.

Description

The double FWDM of a kind of high-isolation receives and dispatches structure

Technical field

This utility model relates to optical-fibre communications field, and the double FWDM of a kind of high-isolation particularly relating to the application of 10GPON field receives and dispatches structure.

Background technology

Along with the application of fiber optic network is more and more universal, the especially digital transmission network with telecommunications network as representative and the fusion application of the analogue signal transmission network with cable television network as representative, the propelling of country's unification of three nets project, GPON product before is many a little by feat of high bandwidth, high efficiency, the unified support of multi-service, good intercommunity and manageability etc., just favored by increasing mainstream carrier, and be considered as the ideal solution of FTTX (especially FTTH).But; rapid deployment along with the flourish of PON sizable application He full-service operation; while protection existing investment, people propose higher expectation to PON system the most gradually at aspects such as bandwidth demand, service supporting capacity, access point apparatus and corollary equipment performances.Therefore how GPON is to system evolved of future generation, enjoys the world to attract attention, and makes joint efforts and under positive contribution in whole world Ge great operator, and FSAN/ITU-T completes the relevant criterion work of NGPON in June, 2010.The sight line of people can be formally entered by the 10GPON of GPON smooth evolution.It is known that 1310nm, 1490nm are the standard wave lengths of digital transport network in GPON, common PWDM structure can perfectly realize country's unification of three nets project, along with the introducing PWDM structure of 10GPON can not meet index demand, this just requires that we again seek new scheme and go to meet the demand of 10GPON.6 wavelength light emissions receiving units in the market are all to realize with double FWDM tail optical fibers.

GPON Yu 10GPON range of application synopsis

nullDouble FWDM of most basic structure receive and dispatch structure，As shown in Figure 1，6 wavelength channels enter first order FWDM optical module 102 by com end 101 input,First order FWDM optical module 102 is single 1550nm reflection all band (full band range 1260-1650nm) thoroughly，The photo-diode reception pipe 103 that a 1550nm receives is coupled in transmission end，Welding principle is utilized to be welded together by sealing bar 104 by the input (com end) of the reflection end (R end) of first order FWDM optical module 102 with second level FWDM optical module 105，Second level FWDM optical module 105 is single saturating 1610 anti-all bands (full band range 1260-1650nm),Transmission end one photo-diode luminous tube 106 of coupling of second level FWDM optical module 105.The most substantially achieve and the light of 1270/1310/1490/1550/1577/1610 is separated.

In traditional structure, substantially carry out the separation of the light to 1270/1310/1490/1550/1577/1610, but the relation due to isolation, the reflection isolation degree that the wave plate of the CWDM wave band that reflection end isolation is general can reach is only 15dB, and this has the biggest interference to the use of end product.

Summary of the invention

For overcoming the problems referred to above, the utility model proposes the double FWDM of a kind of high-isolation and receive and dispatch structure, can be used for miniaturization 6 wavelength reception emitting module, and compact conformation, low cost.

For reaching above-mentioned purpose, the technical scheme that this utility model is proposed is: the double FWDM of a kind of high-isolation receives and dispatches structure, including first order FWDM optical module, second level FWDM optical module, the reflection end of described first order FWDM optical module is welded together by sealing bar with the input of second level FWDM optical module, described first order FWDM optical module projection end couples a photo-diode and receives pipe, described second level FWDM optical module projection end one photo-diode luminous tube of coupling；It is characterized in that: the first order four-core fiber head that includes in described first order FWDM optical module setting gradually along light path, a Glens collimator, single saturating 1550 ± 7.5nm diaphragm, the 2nd Glens collimator；Described first order four-core fiber head connect respectively com end, the first order reflection after outfan, the first order reflection after input, the second level reflection outfan；Include in described second level FWDM optical module along the second level four-core fiber head that light path sets gradually, the 3rd Glens collimator, single saturating 1610 ± 7.5nm diaphragm, the 4th Glens collimator；Described second level four-core fiber head connect respectively in first order FWDM optical module the second level reflection outfan, the third level reflection after outfan, the third level reflection after input, the fourth stage reflection outfan.

Further, described four-core fiber head is for have low-loss optics through optical design.

Further, described diaphragm is CWDM wave band filter plate.

Further, described Glens collimator is 1/2 intercept collimator.

Further, described photo-diode receives pipe is photodetector.

Further, described photo-diode luminous tube is light electrical laser.

Use technique scheme, high-isolation described in the utility model double FWDM transmitting-receiving structure has the beneficial effect that the two grades of transmissions utilizing light, solve common CWDM reflection isolation degree and can only achieve the bottleneck of 15dB, save the space utilizing two panels filter plate superposition to reach to improve reflection isolation degree, while reducing cost, also reduce the volume of finished product.

Accompanying drawing explanation

Fig. 1 is conventional double FWDM principle schematic；

Fig. 2 is described in the utility model pair of FWDM structural principle schematic diagram；

Fig. 3 is the internal light path trend graph of first order FWDM；

Fig. 4 is the internal light path trend graph of second level FWDM；

Fig. 5 is the double FWDM light path trend graph of this utility model；

Reference: 1, com end；2, outfan after first order reflection；3, input after first order reflection；4, second level reflection outfan；5, a Glens collimator；6, the 2nd Glens collimator；7, single saturating 1550 ± 7.5nm diaphragm；8, first order transmission outfan；9, second level FWDM input；10, outfan after third level reflection；11, input after fourth stage reflection；12, fourth stage reflection outfan；13, the 3rd Glens collimator；14, the 4th Glens collimator；15, single saturating 1610 ± 7.5nm diaphragm；16, second level transmission outfan；17, sealing bar.

Detailed description of the invention；

Below in conjunction with the accompanying drawings and detailed description of the invention, this utility model is described further.

As shown in Figure 2-5, the double FWDM of high-isolation described in the utility model receives and dispatches structure, it is adaptable to the optical signal transceiver of 6 wavelength signals transmission occasions；By the higher order reflection of four-core fiber, CWDM filter plate reflection isolation degree can be improved, isolation is risen to more than 30dB by original 15dB, and the loss on reflection wavelength does not has great impact.

Concrete, com end 1 inputs the light of 12,70/,131,0/1,490,/15,50/,157,7/1,610 6 wavelength, enter a Glens collimator 5, then by single saturating 1550 ± 7.5nm diaphragm 7, the light of 1550 is transmitted in the 2nd Glens collimator 6, conversion through the 2nd Glens collimator 6 becomes Gauss light and is then input to first order transmission outfan 8, so can couple photoelectricity two pole at first order transmission outfan 8 transmission outfan and receive pipe (PD) 18；And outfan 2 enters input 3 after first order reflection after the light that other reflects back is reflected by the first order, then through a Glens collimator 5, carry out secondary Transflective again by single saturating 1550 ± 7.5nm diaphragm 7；The light finally reflected back reflects through second level reflection outfan 4, and the light so reflected reforms into 127,0/1,310,/14,90/,157,7/1,610 5 kinds of spectrum；The second level is in like manner reflected the light in outfan 4 utilize welding principle that the second level is reflected outfan 4 and second level FWDM optical module input 9 to be welded together by sealing bar 17,1270/1310/1490/1577/1610 light is all arrived single saturating 1610 ± 7.5nm diaphragm 15 by the 3rd Glens collimator 13, at this moment acting on the light transmission of 1610 due to single saturating 1610 ± 7.5nm diaphragm 15, other light all reflects；1610 light passed through become, through the 4th Glens collimator 14, the Gauss light that can couple and enter second level transmission outfan 16, couple a photo-diode luminous tube (LD) 19 on second level transmission outfan 16.The light of other reflection outfan 10 after the path third level is reflected arrives input 11 after third level reflection again, after after being reflected by third level level, input 11 enters the 3rd Glens collimator 13, then the effect passing through single saturating 1610 ± 7.5nm diaphragm 15 carries out secondary Transflective to the light reflected back；The light finally reflected back reflects through fourth stage reflection outfan 12, and the light at this moment reflected reforms into 1,270,/13,10/,149,0/1,577 4 kinds of wavelength；The light 1310 and 1490 reflected back can be used on GPON product；And 1270 and 1577 can be evolved in the technical scope that 10GPON is used；Due to promoting the use of rear end entirely without impact of isolation.

Those skilled in the art should be understood that in the spirit and scope of the present utility model limited without departing from appended claims, and the various changes made this utility model in the form and details are protection domain of the present utility model.

Claims

1. the double FWDM of high-isolation receives and dispatches structure, including first order FWDM optical module, second level FWDM optical module, the reflection end of described first order FWDM optical module is welded together by sealing bar with the input of second level FWDM optical module, described first order FWDM optical module projection end couples a photo-diode and receives pipe, described second level FWDM optical module projection end one photo-diode luminous tube of coupling；It is characterized in that: the first order four-core fiber head that includes in described first order FWDM optical module setting gradually along light path, a Glens collimator, single saturating 1550 ± 7.5nm diaphragm, the 2nd Glens collimator；Described first order four-core fiber head connect respectively com end, the first order reflection after outfan, the first order reflection after input, the second level reflection outfan；Include in described second level FWDM optical module along the second level four-core fiber head that light path sets gradually, the 3rd Glens collimator, single saturating 1610 ± 7.5nm diaphragm, the 4th Glens collimator；Described second level four-core fiber head connect respectively in first order FWDM optical module the second level reflection outfan, the third level reflection after outfan, the third level reflection after input, the fourth stage reflection outfan.

The double FWDM of a kind of high-isolation the most according to claim 1 receives and dispatches structure, it is characterised in that: described four-core fiber head is for have low-loss optics through optical design.

The double FWDM of a kind of high-isolation the most according to claim 1 receives and dispatches structure, it is characterised in that: described diaphragm is CWDM wave band filter plate.

The double FWDM of a kind of high-isolation the most according to claim 1 receives and dispatches structure, it is characterised in that: described Glens collimator is 1/2 intercept collimator.

The double FWDM of a kind of high-isolation the most according to claim 1 receives and dispatches structure, it is characterised in that: it is photodetector that described photo-diode receives pipe.

The double FWDM of a kind of high-isolation the most according to claim 1 receives and dispatches structure, it is characterised in that: described photo-diode luminous tube is light electrical laser.