KR200447319Y1 - Adapter with mode converter - Google Patents

Abstract

The present invention relates to an adapter type mode converter, and more particularly, in a passive optical network, a single mode optical fiber and a multimode optical fiber are connected in a connector form while minimizing insertion loss and polarization dependent loss without using a multimode conversion splitter. An adapter type mode converter that can be used.

The adapter type mode converter according to the present invention includes a housing 50 configured to mate with a receptacle, a hook 40 having a mounting structure for mounting with a receptacle disposed in the housing 50 and inserted at one side, and the A sleeve 30 inserted into the hook 40 and mounted therein, a ferrule 10 continuously disposed with the sleeve 30, and the ferrule 10 are accommodated and mounted inside the housing 50. The ferrule 10 is characterized in that the single-mode optical fiber 11 and the multi-mode optical fiber 12 are fused and inserted.

Mode converter, single mode, multimode, ferrule, housing, adapter

Description

Adapter type mode converter {ADAPTER WITH MODE CONVERTER}

The present invention relates to an adapter type mode converter, and more particularly, in a passive optical network, a single mode optical fiber and a multimode optical fiber are connected in a connector form while minimizing insertion loss and polarization dependent loss without using a multimode conversion splitter. An adapter type mode converter that can be used.

In optical transmission systems, single-mode fiber (SMF) is used for high-speed long-distance communications (hundreds to hundreds of kilometers). Multi-mode fiber (MMF) is used for low-speed short-range communications (hundreds of meters). Used.

The SMF is characterized in that the diameter of the optical fiber core that acts as a light path is 8 ~ 9 ㎛ as the light proceeds in a single path, MMF has a 50 ~ 62.5 ㎛ optical fiber core diameter and proceeds in a multi-path It is characterized by.

On the other hand, the MMF has a larger numerical aperture (NA) than the SMF, so it is easy to couple to a light emitting diode (LED), which is a signal source, and thus it is easy to connect and connect at many junctions. It was widely used, and most of the fiber installed in existing buildings or school campuses was MMF.

However, Gigabit (Gb / s) transmission rate is required at the transmission rate of several megabits (Mb / s) in accordance with the demand for bandwidth expansion due to the increasing trend of multimedia communication and the Internet. Conversion to SMF may be the preferred method. This is because the MMF has a difference in arrival time between modes due to the characteristics of multipaths, thereby causing a modal dispersion, thereby showing a limitation in bandwidth improvement. However, replacing all of the existing MMFs with SMFs requires considerable replacement costs and is therefore not a preferred method at present, and a gradual replacement would be desirable.

On the other hand, by replacing the existing LED with LD, or by changing the method of incidence when entering from the SMF to the MMF, by controlling the number of modes that enter the MMF, the differential modal delay (DMD) between the modes is reduced and as a result There is a method of expanding the bandwidth to meet the bandwidth extension requirement.

Herein, an angled launching method and an offset launching method are proposed as a method of reducing the delay difference between modes by converting the incident method when the SMF enters the MMF and exciting the selective mode in the MMF. The offset incidence method is an incident method in which the optical signal from the SMF is incident at a predetermined distance from the center of the core of the MMF, and the center depression of the MMF refractive index generated by injecting only the lower order mode, which is the central launching method, is entered. In addition to solving the bandwidth reduction due to the central dip, it reduces the modal noise generated when the LD is used compared to the central incidence method, and also reduces the mode power in the MMF generated in the higher-order mode in the angled launching method. It is an advantage in that it can be improved. This is an intermediate method of the central incidence method using only the lower order mode and the angular incidence method using only the higher order mode, which excites a small mode group in the MMF. It is also known to inject energy into the MMF more evenly than the central incidence method. The technology is commercialized as offset ceramic ferrules and mode conditioning patchcords.

However, the conventional mode converter as described above has a problem in that non-uniform insertion loss and polarization dependent loss occur when converting from multimode to single mode, and in particular, multimode optical fiber installed in an existing apartment in a passive optical network (PON). There is an urgent need for a connector-type mode converter that utilizes the system and can easily and quickly connect to a passive optical network.

The present invention is to solve the above problems, an object of the present invention is to provide a passive optical network while minimizing the insertion loss and the polarization-dependent loss in the form of a connector that can connect one side of the ferrule and the other side of the multimode fiber. It is to provide an adapter type mode converter that can be easily applied.

The adapter type mode converter according to the present invention includes a housing 50 configured to mate with a receptacle, a hook 40 having a mounting structure for mounting with a receptacle disposed in the housing 50 and inserted at one side, and the A sleeve 30 inserted into the hook 40 and mounted therein, a ferrule 10 continuously disposed with the sleeve 30, and the ferrule 10 are accommodated and mounted inside the housing 50. The ferrule 10 is characterized in that the single-mode optical fiber 11 and the multi-mode optical fiber 12 are fused and inserted.

In this case, the housing is selected from among SC (Subscriber Connector or Square Connector), ST (Straight Tip), FC (Fiber Trensmission System Conector), LC (Lusent Connector), MTRJ (Mechanical Transferable Registered Jack), and MU (Miniature Unit) type. It is done.

As described above, according to the present invention, the single-mode optical fiber required in the passive optical network can be connected to the multi-mode optical fiber simply and quickly by using the adapter-type mode converter according to the present invention, which greatly improves the work efficiency and equipment. It will be possible to reduce the cost of.

In addition, by fusion-connecting the single-mode optical fiber and the multi-mode optical fiber inside the ferrule has the effect of minimizing the insertion loss and the polarization dependent loss to improve the reliability of the product.

In addition, the present invention is short in length and allows simple field connection without the use of a connector connection platform or separate crimping tool.

Hereinafter, with reference to the accompanying drawings will be described in detail the adapter type mode converter according to the present invention.

1 is a schematic configuration diagram of an adapter type mode converter according to an embodiment of the present invention, Figure 2 is an exploded cross-sectional view of Figure 1, Figure 3 is a ferrule in the adapter type mode converter according to an embodiment of the present invention It is a cross-sectional block diagram.

In adding the reference numerals to the components of the drawings, the same components are to have the same reference numerals as much as possible even if displayed on different drawings, it is known that it may unnecessarily obscure the subject matter of the present invention Detailed description of functions and configurations will be omitted. Also, directional terms such as 'top', 'bottom', 'front', 'back', 'leading', 'front', 'back' and the like are used in connection with the orientation of the disclosed figure (s). Since the components of the embodiments of the present invention may be positioned in various orientations, the directional terminology is used for the purpose of illustration and not limitation. Other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention.

Adapter type mode converter according to an embodiment of the present invention, as shown in Figures 1 to 3, the housing 50 is configured to mate with the receptacle, the receptacle disposed in the housing 50 and inserted in one side; A hook 40 having a mounting structure for mounting, a sleeve 30 inserted into and mounted in the hook 40, a ferrule 10 continuously disposed with the sleeve 30, and the ferrule ( 10) is accommodated and comprises a frame 20 which is mounted inside the housing 50, the ferrule 10, the single-mode optical fiber 11 and the multi-mode optical fiber 12 is fused and inserted. . That is, one side is connected to a single mode optical fiber 11 (hereinafter referred to as SMF), and the other side is an adapter shape to which a multimode optical fiber 12 (hereinafter referred to as MMF ') is connected, and the SMF and MMF are fused. The ferrule 10 is mounted inside the ferrule 10. In addition, the ferrule 10 is configured to be mounted inside the hollow frame 20 and the housing 50.

Here, the adapter type mode converter according to the present invention is configured to match each receptacle of a corresponding type, and the exemplary adapter type mode converter 70 shown in FIGS. 1 and 2 is configured as having an SC type. However, as will be apparent to those skilled in the art, the present invention may be provided in a type having other standard formats such as ST, FC and LC formats.

Here, the format may be a Subscriber Connector or Square Connector (SC), a Straight Tip (ST), a Fiber Trensmission System Conector (FC), a Lucent Connector (LC), a Mechanical Transferable Registered Jack (MTRJ), a Miniature Unit (MU), or the like.

The invention is short in length and simple in field connection, and can be achieved without the use of a connector connection platform or a separate crimping tool.

The invention can be easily installed and used for Fiber To The Home (FTTH) and / or Fiber To The X (FTTX) network installations, especially in passive optical networks (PONs). It can be used with great advantage in connecting SMF and MMF. In other words, it can be used without using a multi-mode conversion distributor, and such connection has the advantage of achieving without the use of a connector connection platform or a separate crimping tool as described above.

One of the biggest features of the present invention is that it is usefully used in a passive optical network (PON) as described above, and it is easy to use SMF and MMF as an adapter type connector.

As shown in FIGS. 1 and 2, the adapter type mode converter 70 includes a hook 40, a sleeve 30, a frame 20, and a ferrule 10 sequentially mounted in the housing 50. do. In addition, although not shown, it may include a boot coupled to the housing 50.

Also in a preferred aspect a ferrule cap 72 may be disposed at the front end of the adapter type mode converter 70 to protect the end of the ferrule 10 when not in use as shown in FIG. 1. In addition, a dust cap 74 may be mounted at the rear end of the adapter type mode converter 70 in which the ferrule cap 72 is not mounted to prevent foreign substances from entering.

The housing 50 is formed with an outer shell configured to be received within an SC receptacle (eg, an SC coupling, an SC adapter, or an SC socket). Then, the frame 20 (also referred to as a barrel), the sleeve 30 and the hook 40 for accommodating the ferrule 10 and the splice device are accommodated. Here, the adapter type will be changed depending on whether the housing has the SC, ST, FC, LC, MTRJ, or MU type.

The present invention is connected to an SMF or MMF, which may be a jacket-type optical fiber including an outer jacket (having a buffer coating, etc.), a fiber portion (clad and core) and a strength member. In this case, the strength member includes aramid, Kevlar or polyester yarn or strand disposed between the outer jacket portion and the fiber portion.

The frame 20 is hollow to allow the ferrule 10 to penetrate, and a coupling structure is formed at the outside to be coupled to the inner surface of the housing 50. The coupling structure is formed as two steppeds in one embodiment of the present invention, the stepped side is formed on the inner surface of the housing 50 to correspond to this.

The sleeve 30 is disposed with the ferrule 10 accommodated in the frame 20 and the ring 24 interposed therebetween, and the sleeve 30 is accommodated in the hook 40. At this time, the sleeve 30 is disposed so as not to be separated to the outside by the stopper (32).

In addition, a flange 22 is formed inside the frame 20 to fix the ferrule 10.

In addition, the ferrule 10 may be formed of ceramic, glass, plastic or metal material to support the optical fiber that is inserted and fixed therein. Preferably it is a ceramic ferrule.

The optical fiber inserted into the ferrule 10 has an end slightly protruding from the end face of the ferrule 10, coinciding with or coplanar with the end face of the ferrule 10.

The present invention is that one side of the optical fiber inserted into the ferrule 10 is SMF and the other side is MMF. That is, as shown in FIG. 3, the SMF 11 and the MMF 12 are formed by fusion bonding, and such fusion applies a known technique.

Table 1 shows the insertion loss and the polarization dependent loss when the present invention is applied. Table 2 shows the insertion loss and the polarization dependent loss when the conventional optical fiber mode conversion splitter is used.

 Example SMF-> MMF MMF-> SMF 1310 nm 1550nm 1310 nm 1550nm IL PDL IL PDL IL PDL IL PDL One 0.19 0.02 0.23 0.02 1.05 0.25 0.86 0.28 2 0.15 0.03 0.27 0.03 0.87 0.23 0.79 0.29 3 0.16 0.03 0.15 0.03 1.48 0.38 0.95 0.43 4 0.27 0.03 0.16 0.03 1.22 0.84 1.12 0.42 Code type 0.18 0.08 0.19 0.02 1.15 0.82 0.92 0.68

* IL: insertion loss, PDL: polarization dependent loss

* Code type refers to the type of optical fiber connected between the adapter type mode converter of the present invention.

division 1 × 1 1 × 2 1 × 4 1 × 8 SMF-> MMF MMF-> SMF SMF-> MMF MMF-> SMF SMF-> MMF MMF-> SMF SMF-> MMF MMF-> SMF Operating wavelength 1260-1650 nm Insertion loss 0.5 3.5 4.5 7.5 8.0 11.0 11.0 14.0 Uniformity - - 0.6 1.0 0.8 1.4 1.0 1.8 Polarization dependent loss 0.3 1.0 0.3 1.0 0.3 1.0 0.3 1.0 Return loss More than 35dB - More than 35dB - More than 35dB - More than 35dB - directional 55 or more

As described above, the adapter type mode converter of the present invention is short in length and short in assembly time, enables simple field access, and can be easily installed and used for FTTP and / or FTTX network equipment.

The embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical spirit of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art can change and change the technical idea of the present invention in various forms. Therefore, such improvements and modifications will fall within the protection scope of the present invention, if it is obvious to those skilled in the art.

1 is a schematic configuration diagram of an adapter type mode converter according to an embodiment of the present invention,

2 is an exploded cross-sectional view of FIG.

Figure 3 is a cross-sectional view of the ferrule in the adapter-type mode converter according to an embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

10: Ferrule

11: Single-Mode Fiber (SMF)

12: Multi-Mode Fiber (MMF)

20: Frame 22: Frangipani

24: ring 30: sleeve

32: stopper 40: hook

50: housing 70: adapter type converter

72: ferrule cap 74: dust cap

Claims (2)

A hook (40) having a housing (50) configured to mate with a receptacle, a mounting structure for mounting with a receptacle disposed in the housing (50) and inserted at one side, and inserted into and mounted in the hook (40) A sleeve 30, a ferrule 10 disposed in series with the sleeve 30, and a frame 20 in which the ferrule 10 is received and mounted inside the housing 50. , The ferrule (10), the adapter mode converter, characterized in that the single mode optical fiber 11 and the multi-mode optical fiber 12 is fused and inserted. The method of claim 1, The housing is selected from among SC (Subscriber Connector or Square Connector), ST (Straight Tip), FC (Fiber Trensmission System Conector), LC (Lusent Connector), MTRJ (Mechanical Transferable Registered Jack), and MU (Miniature Unit). Adapter type mode converter, characterized in that.

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