VSFF connector and adapter

Abstract

A cross-compatible VSFF connection system includes fiber optic connectors compatible with at least two types of adapters and adapters compatible with at least two types of fiber optic connectors. The fiber optic connector has one or both of a connector locking groove and a depressible locking portion, and the same adapter has one or both of an adapter locking arm and an adapter locking groove. The dual locking function connector and adapter can be connected to a mating component having only one type of locking structure, for example, having only a groove or only a locking portion. The connection system may be a duplex or MT, and may facilitate push-pull sheath remote release and polarity change.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 63 / 370,060, filed on August 1, 2022, the entire contents of which are incorporated herein by reference for all purposes. Background Art

[0003] Very small form factor (VSFF) fiber connection systems are needed to support the development of next-generation data centers. Various VSFF solutions have been proposed. The two VSFF connection systems that the industry is currently focusing on are: SN-type connection systems (including SN and SN-MT connection system components) and MDC / MMC-type connection systems (including MDC / MMC connection system components). Both the SN-type connection system and the MDC / MMC-type connection system include a duplex connector component and an MT connector component. The VSFF duplex connector (referred to as "SN" and "MDC" connectors, respectively) includes first and second single-fiber ferrules (1.25 mm LC ferrules) stacked one above the other in a connector housing. The VSFF MT connector (referred to as "SN-MT" and "MMC" connectors, respectively) has an MT ferrule in the connector housing, with a row of optical fibers arranged in the MT ferrule extending along a vertical line. Although both the SN-type connection system and the MDC / MMC-type connection system include connectors of approximately the same size and fiber end face layout, the connectors and adapters are not cross-compatible. The inventors believe that the adoption of VSFF will be accelerated if there is cross-compatibility between SN type connection systems and MDC / MMC type connection systems. Summary of the invention

[0004] In one aspect, a VSFF fiber optic connector includes a connector housing having a top portion and a bottom portion. A ferrule device terminates a plurality of optical fibers. The ferrule device includes one of (i) a pair of spring-loaded single-fiber ferrules and (ii) a spring-loaded MT ferrule. The ferrule device is received into the connector housing such that the optical fibers are vertically spaced apart between the top portion and the bottom portion of the connector housing. The connector locking groove is configured to lock with an adapter locking arm of a first type of mating adapter. The connector lock is configured to lock with an adapter locking groove of a second type of mating adapter.

[0005] In another aspect, a fiber optic adapter for one or more VSFF connectors includes a top wall defining an upper locking groove configured to lock with a first compressible locking portion of a first type VSFF connector. A bottom wall defines a lower locking groove configured to lock with a second compressible locking arm of the first type VSFF connector. A pair of opposing locking arms configured to lock with the upper locking groove and the lower locking groove of a second type VSFF connector.

[0006] In another aspect, a VSFF fiber optic connector includes a connector housing having a top portion and a bottom portion. A ferrule device terminates a plurality of optical fibers arranged in at least one row. The ferrule device includes one of (i) a pair of spring-loaded single-fiber ferrules and (ii) a spring-loaded MT ferrule. The ferrule device is received in the connector housing so that the optical fibers of the at least one row are vertically spaced between the top portion and the bottom portion of the connector housing. The remote release assembly includes a first extension and a second extension. The first extension slidably engages the top portion of the connector housing, and the second extension slidably engages the bottom portion of the connector housing. The remote release assembly is configured to move backward relative to the connector housing. Each extension is configured to release a corresponding locking connection between the connector housing and the mating adapter when the remote release assembly moves backward relative to the connector housing.

[0007] In another aspect, a fiber optic adapter for one or more VSFF connectors includes a receptacle defining an opening for receiving one or more VSFF connectors. The receptacle is configured to receive a first compressible locking portion of a first type VSFF connector so as to releasably connect with the first type VSFF connector. A locking mechanism in the receptacle is configured to releasably receive a locking recess of a second type VSFF connector so that either the first type VSFF connector or the second type VSFF connector can be received in the opening and releasably connected to the receptacle.

[0008] Other aspects and features will become apparent hereinafter. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1A is a perspective view of an SN duplex connector interface in the prior art;

[0010] Figure 1B yes Figure 1A End view of the SN duplex connector interface;

[0011] Figure 1C yes Figure 1A Side view of the SN duplex connector interface;

[0012] Figure 1D yes Figure 1A Top view of the SN duplex connector interface;

[0013] Figure 1E yes Figure 1A Bottom view of the SN duplex connector interface;

[0014] Figure 1F is along Figure 1A A vertical cross-sectional view of the insertion axis of the SN duplex connector interface;

[0015] Figure 2Ais an end view of a quadruple SN adapter in the prior art;

[0016] Figure 2B is a vertical cross-sectional view of a quadruple SN adapter in the prior art along the insertion axis;

[0017] Figure 3A is a side view of an MDC connector in the prior art;

[0018] Figure 3B yes Figure 3A A perspective view of the MDC connector;

[0019] Figure 3C yes Figure 3A Another perspective view of the MDC connector, showing its push-pull boot assembly partially separated from its connector housing portion;

[0020] Figure 3D yes Figure 3A An exploded view of the MDC connector showing the push-pull boot assembly separated from the connector housing;

[0021] Figure 4A is a top view of a quadruple MDC adapter interface in the prior art;

[0022] Figure 4B yes Figure 4A End view of the middle quadruple MDC adapter interface;

[0023] Figure 4C yes Figure 4A Vertical section of the middle quadruple MDC adapter interface along the insertion axis;

[0024] Figure 5 is a view of a cross-compatible VSFF connector;

[0025] Figure 6 yes Figure 5 An exploded view of the VSFF connector in Figure 2;

[0026] Figure 7 yes Figure 5 A perspective view of the VSFF connector;

[0027] Figure 8 yes Figure 5 End view of the VSFF connector;

[0028] Fig. 9 is with Figure 5 End view of an adapter that is compatible with VSFF connectors and SN duplex connectors;

[0029] Fig.10 yes Figure 5 An exploded view of the VSFF connector in Figure 2;

[0030] Fig.11 is along Fig. 9 A longitudinal cross-sectional view of the insertion axis of the adapter interface of the adapter;

[0031] Fig.12 is a top view of another embodiment of a cross-compatible VSFF connector;

[0032] Fig.13 yes Fig.12 A partial view of a VSFF connector with portions of the connector housing removed to illustrate an extension piece received in a slot of the connector housing;

[0033] Fig.14 is a top view of another embodiment of a cross-compatible VSFF connector;

[0034] Fig.15 yes Fig.14 Side view of the VSFF connector;

[0035] Fig.16 is a perspective view of another embodiment of a cross-compatible VSFF connector;

[0036] Fig.17 yes Fig.16 Side view of the VSFF connector;

[0037] Fig.18 yes Fig.16 Top view of the VSFF connector;

[0038] Fig.19 yes Fig.16 An exploded view of the VSFF connector in Figure 2;

[0039] Fig.19A yes Fig.16 A perspective view of the locking body of the VSFF connector;

[0040] Fig. 20 is used with Fig.16 A perspective view of a dual lock adapter mating with a VSFF connector;

[0041] Fig.21 yes Fig. 20 A side view of the adapter;

[0042] Fig. 22 yes Fig. 20 Top view of the adapter;

[0043] Fig.23 is along Fig. 20 A vertical cross-sectional view of the insertion shaft of the middle adapter;

[0044] Fig.24 is with Fig.23 Similar cross-sectional view, but showing the Fig.16 Locking arm adapter for mating with VSFF connector;

[0045] Fig.25 is with Fig.23 Another similar cross-sectional view, but showing the Fig.16 Locking groove adapter for mating with VSFF connector;

[0046] Fig.26 is a partial vertical sectional view along the insertion axis, showing Fig.16 VSFF connector with Fig. 20 The state of the adapter mating;

[0047] Fig. 27 is with Fig.26 a similar cross-sectional view, but showing the connection system after a first stage unlocking operation;

[0048] Fig.28 is with Fig.26 a similar cross-sectional view, but showing the connection system after a second stage unlocking operation;

[0049] Fig.29 is Fig.28 An enlarged partial cross-sectional view of the connection system in the configuration of Fig.16 The slope surface of the VSFF connector is bent Fig. 20 an adapter locking arm of the middle adapter;

[0050] Fig.30 is a partial vertical sectional view along the insertion axis, showing Fig.16 VSFF connector with Fig.24 The state of the adapter mating;

[0051] Fig.31 is with Fig.30 A similar cross-sectional view is shown for Fig.16 Middle connector from Fig.24 Unlock operation of adapter unlocking;

[0052] Fig.32 yes Fig.31 An enlarged partial cross-sectional view of the connection system in FIG. Fig.16 The slope surface of the VSFF connector is bent Fig.24 A locking arm of the middle adapter;

[0053] Fig.33 is a partial vertical sectional view along the insertion axis, showing Fig.16 VSFF connector with Fig.25 The state of the adapter mating;

[0054] Fig.34 is with Fig.33 A similar cross-sectional view is shown for Fig.16 Middle connector from Fig.25 Unlock operation of adapter unlocking;

[0055] Fig.35 is a perspective view of another embodiment of a cross-compatible VSFF connector;

[0056] Fig.36 yes Fig.35 An exploded perspective view of the VSFF connector;

[0057] Fig.37 is used with Fig.35 A vertical cross-sectional view along the insertion axis of the adapter mating with the connector;

[0058] Fig.38 is a partial vertical sectional view along the insertion axis, showing Fig.35 Connector and Fig.37 The state of the adapter mating;

[0059] Fig.39 is with Fig.38 A similar cross-sectional view shows Fig.35 Connector and Fig.37 a state in which the adapter is partially unlocked; and

[0060] Fig.40 is with Fig.38 A similar cross-sectional view shows Fig.35 Middle connector from Fig.37 The state of the adapter being unlocked.

[0061] Corresponding parts are given corresponding reference numerals throughout the drawings. DETAILED DESCRIPTION

[0062] The present disclosure generally relates to novel VSFF connectors and adapters that can facilitate cross-compatibility between different types of VSFF connectors and adapters. FIG. 1-34 shows a duplex VSFF connection system component, and FIG. Figure 35-40 MT connection system components are shown. However, it should be understood that the features of any connector or adapter according to the present disclosure can be applied to other types of ferrules. In other words, any duplex type connector or adapter disclosed herein can be adapted to use a single MT ferrule instead of two single fiber ferrules. Similarly, any MT type connector or adapter disclosed herein can be adapted to use two single fiber ferrules instead of MT ferrules.

[0063] Traditional SN type connection system

[0064] See also Figures 1A-1F , a duplex SN connector in the prior art is generally indicated at 10 . Figures 1A-1F Only the interface portion of the SN connector 10 is shown, i.e., the front portion of the connector, which directly interfaces with and fits inside the adapter port. A skilled person will recognize that the complete SN connector 10 includes the rear portion and cable protection cover, which are not shown. Figure 1F As shown, the SN connector 10 includes an inner front body 12, an outer body 14, two optical fiber ferrules 16 and two ferrule springs 18. In the complete connector 10, the rear body (not shown) is fixed to the inner front body 12 to compress the ferrule springs 18 and elastically bias the ferrules forward. The inner front body 12 includes a top locking groove and a bottom locking groove 20, and the outer body 14 includes a top opening and a bottom opening 22 ( Figure 1D-1E ), the opening exposes the locking groove 20 and the rearwardly inclined edges 24 on both sides of the locking opening (see Figure 1A The outer shell 14 also includes top and bottom polarity bonds 26, 28 ( Figure 1C-1E ). The top and bottom polarity keys 26, 28 have different shapes and / or positions so that the connector 10 can only be mated with the adapter in one correct orientation. Differently configured polarity keys 26, 28 will hinder the insertion of the connector in an inverted orientation. In an exemplary embodiment, the upper polarity key 26 is generally centered on the centerline CL of the connector and has a first width W1, while the lower polarity key 28 is laterally offset from the centerline and has a second width W2 that is narrower than the first width W1.

[0065] See also Figure 2A-2B , generally indicated at reference numeral 30, is a conventional quadruple (i.e., quad connector) adapter interface for the SN connector 10. The illustrated adapter interface 30 defines four ports. Each port has a pair of upper and lower locking arms 32, an upper keyway 36, and a lower keyway 38. The size, shape, and position of the upper keyway 36 correspond to the size, shape, and position of the upper key 26 of the SN connector 10, and the size, shape, and position of the lower keyway 38 correspond to the size, shape, and position of the lower key 28. Thus, the SN connector 10 can be inserted into any one of the connector ports. The upper and lower keys 26, 28 will be slidingly received in the upper and lower keyways 36, 38, respectively, and the opposing locking arms 32 (broadly referred to as "locking mechanisms") will lock with the locking grooves 20 on the inner front body 12. To unlock the connector 10 from the adapter 30, the user moves the outer housing 14 rearwardly so that the ramped edge 24 of the outer housing lifts the adapter locking arms 32 away from the locking grooves 20.

[0066] Figures 1A-1F The main difference between the duplex SN connector 10 shown in FIG. 1 and the SN-MT connector is that the two spring-loaded single-fiber ferrules 16 are replaced by spring-loaded MT ferrules.

[0067] For more information on SN-type VSFF connection system components, reference may be made to U.S. Patent Nos. 11,307,369, 11,280,972, and 10,705,300, which are incorporated herein by reference in their entirety.

[0068] Traditional MDC / MMC type connection system

[0069] 3, a duplex MDC connector is generally indicated by reference numeral 40. The MDC connector includes a connector housing 42, a pair of spring-loaded fiber optic terminals 44 received in the connector housing, and a rotatable push-pull sheath assembly 46, which includes a push-pull sheath 48 and an extension 50 located above the connector housing. The connector housing 42 includes dovetail-shaped longitudinal grooves 49 ( Figure 3C ). The extension 50 includes a dovetail tongue configured to be slidably received in any of the slots 49 to capture the extension and prevent vertical movement between the extension and the housing 42. The extension 50 also includes a depressible locking portion 52 and a release portion 54. The depressible locking portion 52 protrudes upward to lock into a groove of the mating interface. The release portion 54 includes a slot through which the locking portion 52 protrudes. The release portion 54 is operatively connected to the push-pull sheath 48 so that the release portion 54 can move backward when the user pulls the push-pull sheath. During use, when the user pulls the push-pull sheath 48, the release portion 54 moves backward so that the front depresses the locking portion 52, thereby unlocking the connector 40 from the mating interface. In the MDC connector, the extension 50 acts as a single polarity key for the connector 40. The polarity of connector 40 can be changed by separating boot assembly 46 from housing 42, rotating the boot assembly 180°, and then reinstalling the boot assembly onto the connector housing in an inverted orientation with extension 50 sliding into dovetail groove 49 on the opposite side of the housing.

[0070] refer to Figures 4A-4C , a conventional MDC quadruple adapter interface is generally indicated by reference numeral 60. The illustrated adapter interface 60 defines four ports. Each port has an upper locking groove 62, an upper alignment rib 64, and a lower alignment rib 66, wherein the lower alignment rib is shorter in height than the upper alignment rib. The upper and lower alignment ribs 64, 66 are sized such that the MDC connector 40 can only be inserted into the adapter port in one orientation. If an attempt is made to insert the MDC connector 40 in an inverted orientation, the ribs 64, 66 will interfere with the insertion. When the MDC connector 40 is inserted, the depressible locking portion 52 will lock with the locking groove 62 and can be unlocked using the push-pull sheath release mechanism described above.

[0071] Figures 3A-3DThe main difference between the illustrated duplex MDC connector 40 and the SN-MT connector is that the two spring loaded single fiber terminals 44 are replaced by spring loaded MT terminals.

[0072] For more information about MDC / MMC type VSFF connection system components, reference may be made to U.S. Patent Application Publication Nos. US20200285001A1, US20200284998A1, and US20200150357A1, which are incorporated herein by reference in their entirety. "MDC" and "MMC" are product names of Conec Corporation of Hickory, North Carolina, USA.

[0073] Incompatibility between SN and MDC

[0074] Although the dimensions of the connectors and adapter ports of the SN and MDC / MMC types are comparable, and although both connection system types are intended to connect the same types of terminals in the same basic orientation (with the fiber alignment axis extending vertically), the connectors of the SN and MDC / MMC types are not compatible in other types of adapters. For duplex VSFF connectors, the SN connector 10 cannot mate with an MDC adapter port, and conversely, the MDC connector 40 cannot mate with an SN adapter port. Similarly, for MT connectors, an SN-MT connector cannot mate with an MMC adapter port, and conversely, an MMC connector cannot mate with an SN-MT adapter. The inventors have designed a modified VSFF connection system assembly that enables cross-compatibility.

[0075] Cross-compatible VSFF connection system embodiment 1

[0076] refer to Figure 5-11 The VSFF connection system of the first embodiment includes an adapter 110 ( Fig. 9 and Fig.11 ), the adapter is compatible with both the traditional SN connector and the modified MDC connector 140 ( Figure 5-8 and Fig.10 ). The adapter 110 has the same general features as the SN adapter 30 described above, except that two locking grooves 112 are added inside the keyways 114, 116 in each port. Therefore, in the direction in which the VSFF connector is inserted into the adapter 110, the opposing locking arms 132 of the adapter are located inside the upper and lower locking grooves 112, and the upper and lower locking grooves are located inside the first and second keyways 114, 116. The adapter 110 is configured to interface with the SN connector 10 in the same manner as the adapter 30 described above. However, a new MDC connector 140 is provided that is cross-compatible with the same adapter 110.

[0077] The modified MDC connector 140 includes a connector housing 142 and a spring-loaded ferrule 144 of the same type as the MDC connector 40. In addition, the modified MDC connector 140 includes a rotatable push-pull boot assembly 146 (broadly, a remote release assembly) that includes a push-pull boot 148. However, unlike the push-pull boot assembly 46 of the conventional MDC connector 40, the push-pull boot assembly 146 of the modified MDC connector 140 includes a first extension member and a second extension member 150, 151 that are configured to be located above and below the connector housing 142, respectively. There is no side wall between the extension members 150, 151. Each extension member 150, 151 includes a depressible locking portion 152 and a release portion 154, which function the same as the depressible locking portion 52 and the release portion 54 in the conventional MDC connector. Each extension member 150, 151 also includes a corresponding polarity key 155, 157 ( Figure 8 ). Polarity key 155 corresponds in size, shape and position to polarity key 26 of a standard SN connector. Polarity key 157 corresponds in size, shape and position to polarity key 28 of a standard SN connector. Fig.10 As shown, the modified MDC connector 140 can be changed from the first polarity configuration to the second polarity configuration by disconnecting the push-pull boot assembly 146 from the housing 142, rotating the push-pull boot assembly 180° about the cable (not shown), and then reinstalling the inverted push-pull boot assembly to the housing.

[0078] In use, a plurality of conventional SN connectors 10, a plurality of modified MDC connectors 140, or a combination of both types of connectors may be inserted into the ports of the multi-port modified adapter 110. The SN connectors 10 are received in the adapter 110 in the same manner as the SN connectors 10 are received in the conventional SN adapter 30. When the SN connectors are installed, the locking grooves 112 are not used. When the modified MDC connector 140 is inserted into the cross-compatible adapter 110, the keys 155, 157 will be slidably received in the upper and lower key slots 114, 116, respectively. The depressible locking portions 152 will lock with the upper and lower locking grooves 112 and can be unlocked using a push-pull sheath release mechanism that is substantially the same as the conventional MDC connector 40. That is, the push-pull sheath 148 simultaneously actuates the two extensions 154 to depress the locking portions 152. When the modified MDC connector 140 is installed, the adapter locking arms 132 are not used. Therefore, in one or more embodiments, the connector housing 142 is sized and arranged so that it does not form a locked connection with the locking arms 132.

[0079] Cross-compatible VSFF connection system embodiment 2

[0080] See also Figure 12-13The VSFF connection system of the second embodiment includes a conventional SN adapter 30, a conventional SN connector 10, and a modified MDC connector 240 of the second embodiment that is compatible with the conventional SN adapter. The modified MDC connector 240 includes a connector housing 242 that supports a pair of spring-loaded ferrules 244. The connector housing 242 is modified relative to the connector housing 42 and includes upper and lower locking grooves 243 that are located at the same position as the locking grooves 20 of the inner front body 12 of the conventional SN connector 10. Each locking groove 243 defines a rearward locking surface on the left and right sides of the extension guide groove 245. Preferably, the extension guide groove 245 has a dovetail configuration to facilitate a sliding dovetail connection. When the connector 240 is mated with the port of the SN adapter 30, the locking groove 243 is locked with the locking arm 32 of the corresponding port.

[0081] The modified MDC connector 240 also includes a rotatable push-pull boot assembly 246, which includes a rotatable, polarity-changeable push-pull boot 248. However, unlike the push-pull boot assembly 46 of the conventional MDC connector, the push-pull boot assembly 246 of the modified MDC connector 240 includes a first extension piece and a second extension piece 250, 251 configured to be located above and below the connector housing 242. In addition, unlike the conventional extension piece 50, neither of the two extension pieces 250, 251 includes a depressible locking portion. Instead, each extension piece 250, 251 includes a dovetail-shaped arm that is configured to be slidably received in one of the extension piece slots 245. The front end portion of each extension piece arm 250, 251 defines a rearward ramp 259 for unlocking the connector 240 from the adapter 10. When the connector 240 is inserted into the port of the adapter 10, each ramp 259 is located in front of the rearward locking surface of the corresponding locking groove 243. Thus, the adapter locking arm 32 can lock with the locking groove 243 of the connector housing 242. To unlock the connector 240 from the adapter 10, the user pulls the sheath 248, causing the extensions 250, 251 to move rearward. The rearward ramp 259 moves rearward under the locking arm and lifts the locking arm away from the locking groove 243 to unlock the connector 240 from the adapter.

[0082] Each extension piece 250, 251 also includes a corresponding polarity key 255, 257. The size, shape and position of the polarity key 255 corresponds to the polarity key 26 of the standard SN connector. The size, shape and position of the polarity key 257 corresponds to the polarity key 28 of the standard SN connector. The modified MDC connector 240 can be changed from the first polarity configuration to the second polarity configuration by disconnecting the push-pull boot assembly 246 from the housing 242, rotating the push-pull boot assembly 180° around the cable, and then reinstalling the inverted push-pull boot assembly on the housing so that the extension pieces 250, 251 slide into the extension piece slots 245 on the opposite side of the housing 242.

[0083] Cross-compatible VSFF connection system embodiment 3

[0084] See also Figure 14-15 The VSFF connection system of the third embodiment includes a conventional SN adapter 30, a conventional SN connector 10, and a modified MDC connector 340 of the second embodiment that is compatible with the conventional SN adapter. The modified MDC connector 340 includes a connector housing 342 that supports a pair of spring-loaded ferrules 344. The connector housing 342 is modified relative to the connector housing 42 to include upper and lower locking grooves 343 that are located at the same position as the locking grooves 24 of the inner front body 12 of the conventional SN connector 10. Each locking groove 343 is centrally located along the width of the housing 342 along a corresponding central slide rail (obscured by other components in the figure). Preferably, the central slide rail has a dovetail configuration to facilitate sliding dovetail connection. When the connector 340 is mated with the port of the SN adapter 30, the locking groove 343 is locked with the locking arm 32 of each port.

[0085] The modified MDC connector 340 also includes a rotatable push-pull boot assembly 346, which includes a rotatable, reversible polarity push-pull boot 348. However, unlike the push-pull boot assembly 46 of the conventional MDC connector, the push-pull boot assembly 346 of the modified MDC connector 340 includes a first extension and a second extension 350, 351 configured to be located above and below the connector housing 342. In addition, unlike the conventional extension 50, neither of the two extensions 350, 351 includes a depressible locking portion. Instead, each extension 350, 351 includes an extension having a longitudinal dovetail groove along the bottom, which is configured to slidably engage one of the (hidden) dovetail rails of the connector housing 342. The front end portion of each extension 350, 351 defines an opening 371, through which the corresponding locking groove 343 is exposed. Similar to conventional SN connectors, on each lateral side of the locking recess 343 , the respective arms 350 , 351 define left and right rearwardly sloped edges 373 for unlocking the connector 340 from the adapter 10 .

[0086] When the connector 340 is inserted into the port of the adapter 10, each ramp edge 373 is located in front of the corresponding locking groove 343, and each opening 371 is aligned with the corresponding locking groove, so that the adapter locking arm 32 can be locked with the locking groove 343 through the opening 371. To unlock the connector 340 from the adapter 10, the user pulls the sheath 348, causing the extensions 350, 351 to move backward. The rearward ramp edge 373 moves backward under the locking arm 32 and lifts the locking arm away from the locking groove 343 to unlock the connector 340 from the adapter.

[0087] Each extension arm 350, 351 also includes a corresponding polarity key 355, 357. The size, shape and position of the polarity key 355 corresponds to the polarity key 26 of the standard SN connector. The size, shape and position of the polarity key 357 corresponds to the polarity key 28 of the standard SN connector. The modified MDC connector 340 can be changed from the first polarity configuration to the second polarity configuration by disconnecting the push-pull boot assembly 346 from the housing 342, rotating the push-pull boot assembly 180° around the cable, and then reinstalling the inverted push-pull boot assembly on the housing so that the extensions 350, 351 are slidably connected to the slide rail 345 on the other side of the housing 342.

[0088] Cross-compatible VSFF connection system embodiment 4

[0089] See also Figure 16-25 The VSFF connection system of the fourth embodiment includes a dual locking function adapter 430 ( Figure 20-23 )、Lock Arm Adapter 530( Fig.24 )、Lock groove adapter 630( Fig.25 ) and a dual lock function VSFF connector 710 (compatible with each of the dual lock function adapter, the locking arm adapter, and the locking groove adapter Figure 16-19A The dual lock function adapter 430 and the locking arm adapter 530 are also configured to mate with the standard SN connector 10 .

[0090] See also Figure 16-19A , the dual lock function VSFF connector 710 includes a connector housing assembly 711 supporting a pair of spring loaded ferrules 744. In the illustrated embodiment, the connector housing assembly 711 is a three-part assembly ( Fig.19 ), includes an internal housing subassembly 712, a locking housing 713 and a locking release 714. The locking release 714 is fixed to the push-pull sheath 748 so that when the push-pull sheath is pulled to unplug the connector 710 from the adapter, the locking release moves backward with the push-pull sheath. The internal housing subassembly 712 includes a front body 715 and a rear body 716 fixed to the front body to load the ferrule spring for pushing the ferrule 744 forward in the connector housing assembly 711. The inner front body 715 of the internal housing assembly 712 has features similar to the inner front housing 12 of the SN connector. In particular, the inner front body 714 includes an upper locking groove 720 and a lower locking groove 720 configured to facilitate locking with the locking arm adapter 530 and the dual locking function adapter 430 described in detail below.

[0091] The rear end portion of the locking housing 713 includes left and right side walls 721. An upper extension 722 and a lower extension 723 extend forwardly from the rear end portion of the locking housing 713 without a side wall therebetween. The upper extension 722 and the lower extension 723 are configured to slidably engage the upper and lower portions of the inner housing subassembly 712 (e.g., at a sliding tongue-and-groove joint). Fig.16 and Fig.17 As shown, the side wall of the inner front body 715 is exposed between the upper extension 722 and the lower extension 723 of the locking housing 713. The front end portion of each extension 722, 723 defines an opening 771, through which the corresponding locking groove 720 is exposed. Similar to the conventional SN connector, on each lateral side of the locking groove 720, the corresponding extension 722, 723 defines left and right rearward ramp edges 724, which are configured to unlock the connector 710 from the locking arm adapter 530, and also for performing a second stage unlocking operation to unlock the connector from the dual locking function adapter 430, which will be described in detail below.

[0092] Behind the upper extension 722 and the lower extension 723, the upper and lower portions of the locking housing 713 include an upper locking portion and a lower locking portion 752, respectively. Fig.19A Each locking portion 752 cantileveredly extends backward from the corresponding extension portion 722, 723. In addition, each locking portion 752 is centrally positioned in the cutout 753 between the left and right side walls 721. Fig.19A As shown, each locking portion 752 includes an arm portion 755 and a hook portion 757. The front section of the arm portion 755 extends horizontally rearward, while the rear section of the arm portion is angled relative to the front section to extend outward away from the centerline of the connector 710 as it extends rearward to the rear end of the locking portion 752. The front and rear sections of the arm portion 755 intersect at an angle to form a resilient living hinge 759, where the locking portion 722 can be resiliently bent when the locking portion 722 is pressed to unlock. The hook portion 757 protrudes outward from the arm portion 755 to define a forward hook surface.

[0093] See also Figure 16-19 The locking release member 714 includes a rear end portion configured to be fixed to the push-pull sheath 748. The upper extension portion 782 and the lower extension portion 784 protrude forward from the rear end portion of the locking release member 714. Fig.16 and Fig.18As shown, the upper extension 782 and the lower extension 784 of the lock release 714 are configured to be slidably received in the corresponding cutouts 753 of the lock housing 713. Each extension 782, 784 also defines a slot 785, which is configured to receive the corresponding locking portion 752 so that the locking portion protrudes outward. The front of each extension 782, 784 in front of the slot 785 is located above the horizontal front section of the arm portion 755 of the corresponding locking portion 752. As will be described in more detail below, in order to unplug the connector 710 from the adapter 430, 530, 630, the user pulls the sheath 748 backward. This causes the lock release 714 to move backward, causing the front of the extension 782, 784 to slide backward along the angled sections of the arm portion 755 of the locking portion 752, which causes the arm portion 755 to bend at the hinge 759 and press the locking portion inward. The front of the extensions 782, 784 then engages the forward surface of the hook portion 757. This links the locking housing 713 and the locking release 714 together so that further pulling causes the locking housing and the locking release to move backward relative to the inner housing assembly 712 together.

[0094] Thus, in the illustrated embodiment, the locking housing 713, the locking release 714, and the push-pull boot 748 together form a push-pull boot assembly 746 ( Fig.19). Unlike the push-pull sheath assembly 46 of the conventional MDC connector 40, the push-pull sheath assembly 746 of the connector 740 includes an upper extension and a lower extension. The upper extension of the push-pull sheath assembly 746 includes upper extensions 722, 782 of the locking housing 713 and the locking release 714, respectively, and the lower extension of the push-pull sheath assembly 746 includes lower extensions 723, 784 of the locking housing and the locking release, respectively. Each extension includes an SN-type cutout 771 and a ramp surface 724 for unlocking the connector 710 from the SN adapter-type locking arm. In addition, each extension includes a depressible locking portion 752 and a locking actuator similar to the release portion 54 of the conventional MDC connector 40. More specifically, the front function of the locking release extensions 782, 784 is similar to the function of the release portion 54 in the conventional MDC connector (for example, when the push-pull sheath assembly 746 is pulled back, the locking portion 752 is pressed by a cam action). In one or more embodiments, the protruding hook portions 757 of the upper and lower locking portions 752 have different widths so that the locking portions serve as polarity keys. However, it will be appreciated that other polarity key structures (e.g., keys formed on the lock release 714) may also be used without departing from the scope of the present disclosure. Suitably, the polarity key structure corresponds in size, shape, and position to the polarity keys 26, 28 of a standard SN connector. In certain embodiments, the connector 710 may be changed from a first polarity configuration to a second polarity configuration by disconnecting the push-pull sheath assembly 746 from the inner housing assembly 712, rotating the push-pull sheath assembly 180° around the cable (not shown), and then reinstalling the inverted push-pull sheath assembly onto the inner housing assembly.

[0095] See also Figure 20-23 , the dual lock function adapter 430 includes at least one dual function port 431. In the illustrated embodiment, the adapter 430 includes one dual function port 431 and an opposing standard SN adapter port 433 for mating with the standard SN connector 10. This indicates that the dual lock function adapter 430 is capable of mating the standard SN connector with the modified VSFF connector 710. Of course, it is understood that the adapter can be configured to have opposing dual function ports. In addition, although Figure 20-23 A single port adapter 430 is shown, but it will be appreciated that the adapter may be a multi-port adapter without departing from the scope of the present disclosure.

[0096] Each port 431, 433 includes upper and lower adapter locking arms 432 of the type for locking with the SN connector 10. The locking arms 432 in the dual function port 431 are configured to lock with the locking grooves 720 of the connector 710 in the same manner as the conventional SN adapter locking arms lock with the conventional SN adapter. The dual function port 431 also includes upper and lower locking grooves 462 configured to lock with the locking portions 752 of the connector 710.

[0097] See also Fig.24 , the locking arm adapter 530 has a port structure that is substantially the same as the standard SN adapter. That is, the adapter 530 includes two standard SN type ports 533, each of which includes a pair of opposing locking arms 532, which are the type of locking arms configured to lock with an SN connector. Both ports 533 are configured to receive a standard SN connector 10 or a VSFF connector 710. The locking arm adapter 530 does not have a locking groove.

[0098] See also Fig.25 , the locking groove adapter 630 includes at least one port 631 without a locking arm, and completely relies on the upper locking groove and the lower locking groove 662 to lock with the VSFF connector 710. In the illustrated embodiment, the adapter 630 includes a port 631 with only a locking groove and a standard SN port 633 including a pair of opposing locking arms 632. This again shows that the locking groove adapter 630 is capable of establishing an optical connection between a standard SN connector and a VSFF connector 710. Of course, it is understood that the adapter can be configured to have opposing ports with only locking grooves.

[0099] refer to Figure 26 to Figure 29 , the method of using the VSFF connector 710 and the dual lock function adapter 430 will be briefly described. Fig.26 The VSFF connector 710 is shown mated with the dual-function port 431 of the adapter 430. As shown, the adapter locking arm 432 is locked with the locking groove 720, and the connector locking portion 752 is locked with the groove 462. Therefore, when mated with the dual-function port 431, the VSFF connector 710 is configured to establish two locking connection points along the top and bottom of the connector, the first locking connection point is the position where the adapter locking arm 432 is locked with the connector locking groove 720, and the second locking connection point is the position where the connector locking portion 752 is locked with the adapter locking groove 462.

[0100] To remove the connector 710 from the adapter 430, the user pulls back on the push-pull sheath 748, which initiates a two-stage unlocking operation. Fig. 27The first stage of the unlocking operation is shown. When the sheath 748 is pulled back, it moves the lock release 714. The front portion of each extension 782, 784 of the lock release 714 slides back along the angled portion of the arm portion 755 of the adjacent lock portion 752. The cam action bends each arm portion 755 at the hinge 759 and pulls the hook portion 757 inward. In this way, the lock portion 752 is depressed and unlocked from the lock recess 462. At almost the same time, the front portion of the extension 782, 784 is pulled back into engagement with the forward hook surface of the hook 757. This facilitates the second stage of the unlocking operation.

[0101] refer to Fig.28 and Fig.29 When the push-pull sheath 748 is further pulled, the engagement of the extensions 782, 784 with the forward surface of the hook portion 757 connects the locking housing 713 with the locking release 714, so that the sheath moves both the locking housing and the locking release backward relative to the inner housing assembly 712. The rearward displacement of the locking housing 713 pulls the ramp edge 724 along the adapter locking arm 432 and unfolds the adapter locking arm to unlock it from the connector locking groove 720. (The unlocking action here is the same as that of the conventional SN connector and adapter). The adapter locking arm 432 is lifted from the connector locking groove 720 to complete the second stage of the unlocking operation. When the sheath 748 is further pulled, the connector 710 is unplugged and removed from the dual-function port 431.

[0102] refer to Figure 30 to Figure 32 , the method of using the VSFF connector 710 and the locking arm adapter 530 will be briefly described. Fig.30The VSFF connector 710 is shown mated with the locking arm port 533 of the adapter 530. As shown, the adapter locking arm 532 is locked with the locking groove 720, but the connector locking portion 752 is not locked with the adapter 530. Therefore, when mated with the locking arm port 533, the VSFF connector 710 is configured to establish only one locking connection point along each of the top and bottom of the connector, namely the position where the adapter locking arm 432 is locked with the connector locking groove 720. In order to unplug the connector 710 from the adapter 530, the user pulls back the push-pull sheath 748. When the sheath 748 is pulled back, it moves the lock release 714. The front portion of each extension portion 782, 784 slides back along the angled portion of the arm portion 755 of the adjacent locking portion 752. The cam action bends each arm portion 755 at the hinge 759 and pulls the hook portion 757 inward. However, since the locking portion 752 is not locked with the adapter 530, unlocking does not occur when the locking portion is depressed. However, depressing the locking portion 752 allows the front of the extensions 782, 784 to engage with the forward hook surface of the hook 757. When the push-pull sheath 748 is pulled further, the sheath moves both the locking housing and the locking release. The rearward displacement of the locking housing 713 pulls the ramp edge 724 along the adapter locking arms 532 and spreads the adapter locking arms outward so that they are unlocked from the connector locking recesses 720. Lifting the adapter locking arms 532 from the connector locking recesses 720 unlocks the connector 710 from the adapter 530, allowing the connector to be unplugged and removed.

[0103] refer to Figure 33 to Figure 34 , the method of using the VSFF connector and the locking groove adapter 630 will be briefly described. Fig.33 The VSFF connector 710 is shown mated with the port 631 having only a locking groove. The connector locking portion 752 is locked with the groove 662. Therefore, when mated with the port 631 having only a locking groove, the VSFF connector 710 is locked at a position along each of the top and bottom of the connector, that is, the connector locking portion 752 is locked with the adapter locking groove 662 at this position. In order to unplug the connector 710 from the adapter 630, the user pulls the push-pull sheath 748 backward. When the sheath 748 is pulled backward, it moves the lock release 714. The front portion of each extension 782, 784 of the lock release slides backward along the angled portion of the arm portion 755 of the adjacent lock portion 752. The cam action bends each arm portion 755 at the hinge 759 and pulls the hook portion 757 inward. In this way, the lock portion 752 is depressed and unlocked from the locking groove 662. Pulling the sheath 748 further pulls the connector out of the port 631.

[0104] Cross-compatible VSFF connection system embodiment 5

[0105] refer to Figure 35 to Figure 37 The VSFF connection system of the fifth embodiment includes a VSFF MT connector 810 ( Figure 35 to Figure 36 ) and double lock adapter 930 (compatible with connector 810 and standard SN-MT connectors Fig.37 ).like Figure 35 to Figure 36 As shown, the dual lock VSFF connector 810 includes a connector housing assembly 811 supporting a single spring loaded MT ferrule 844. The connector housing assembly 811 is a two-part assembly including an inner housing subassembly 812 and an outer lock release housing 814 that is secured to a push-pull boot 848. Fig.36 As shown, the internal housing subassembly 812 includes a front body 815 and a rear body 816 fixed to the front body to load the ferrule spring for pushing the MT ferrule 844 forward in the connector housing assembly 811. The inner front body 815 of the internal housing assembly 812 has features similar to the inner front housing of the SN or SN-MT connector. In particular, the inner front body 815 includes a top locking groove and a bottom locking groove 820, which are configured to facilitate locking with a standard SN-MT adapter or a dual lock function adapter 930, as described in detail below. The inner front body 815 also includes upper and lower locking portions 852. Each locking portion 852 is angled so that when it extends rearward to the rear end +, it extends outward away from the centerline of the connector 710. Each locking portion 852 is configured to lock with the dual lock function adapter 930 and bend around the elastic living hinge 859 when it is pressed to unlock from the adapter.

[0106] The outer housing 814 includes a front end portion and upper and lower extensions 821, 822 extending rearwardly from the front end portion. There is no side wall between the extensions 821, 822. The upper and lower extensions 821, 822 are configured to slidably engage the upper and lower portions of the inner housing subassembly 812. The front end portion of each extension 821, 822 defines an opening 871 through which the corresponding locking groove 820 is exposed. Similar to conventional SN-MT connectors, on the lateral sides of each locking groove 820, the corresponding extensions 821, 822 define left and right rearwardly inclined ramp edges 824, which are configured to lift the adapter locking arm away from the locking groove 820.

[0107] Behind the opening 871, each extension 821, 822 defines a slot 885 for receiving the corresponding locking portion 852 so that the locking portion protrudes outward from the corresponding extension. The actuating portion 886 of each extension 821, 822 in front of the slot 885 is positioned to slide backward along the corresponding locking portion 752 and depress the locking portion by cam action.

[0108] Behind the slot 885, each extension includes a groove 888 for receiving the wing of the push-pull sheath 848. The groove 888 locks with the push-pull sheath 848 so that when the sheath is pulled back, the outer lock release housing 815 moves with the push-pull sheath.

[0109] Reference Fig.37 , the dual-lock function adapter 930 includes at least one dual-function port 931. In the illustrated embodiment, the adapter 930 includes a dual-function port 931 and an opposing standard SN-MT adapter port 933 for mating with a standard SN-MT connector (not shown). This shows that the dual-lock function adapter 930 is capable of establishing an optical connection between a standard SN-MT connector and a VSFF connector 810. Of course, it will be appreciated that the adapter can be configured to have opposing dual-function ports 931. In addition, it should be appreciated that the adapter can be a multi-port adapter without departing from the scope of the present disclosure. Each port 931, 933 includes an upper locking arm and a lower locking arm 932 of the type for locking an SN-MT connector in a mating adapter. The dual-function port 931 also includes an upper locking groove and a lower locking groove 962 for locking with the locking portion 952 of the connector 910.

[0110] Reference Figure 38-40 , a method of using the VSFF connector 810 and the dual lock function adapter 930 will be briefly described. Fig.38 The VSFF connector 810 is shown mated with the dual function port 931 of the adapter 930. As shown, the adapter locking arm 932 is locked with the connector locking groove 820, and the connector locking portion 852 is locked with the adapter locking groove 962. To remove the connector 810 from the adapter 930, the user pulls the push-pull sheath 848 backward. When the sheath 848 is pulled backward, it displaces the outer lock release housing 814 relative to the inner housing assembly 812. Figure 39-40 As shown, the actuating portion 886 of the extension members 821, 822 slides backward along the connector locking portion 852 and depresses the connector locking portion by cam action. Depressing the connector locking portion 852 unlocks it from the adapter groove 962, as shown in FIG. Fig.40 Almost simultaneously with the locking portion 852 being depressed, the ramp edge 824 slides along the adapter locking arms 932 and expands the adapter locking arms outward so that they are unlocked from the connector locking recess 820. With all locking points released, when the sheath 848 is further pulled, the connector 810 is unplugged and removed from the dual function port 931.

[0111] It should be understood that the VSFF connector 810 with dual locking function is also compatible with a standard SN-MT adapter (not shown) that has only the adapter locking arm 932 but not the locking groove 962. Likewise, the VSFF connector 810 with dual locking function is also compatible with an adapter (not shown) that has only the adapter locking groove 962 but not the adapter locking arm 932. In addition, it can be seen that the dual function port 931 of the adapter 930 can be mated with a standard SN-MT connector (not shown).

[0112] Thus, it can be seen that the present disclosure provides a cross-compatibility solution for several VSFF connection systems. By making the VSFF connection system cross-compatible, the inventors believe that the industry may adopt VSFF technology more quickly, which is expected to bring significant benefits in terms of improved network bandwidth, reliability, design and implementation.

[0113] When introducing elements of the present disclosure or the preferred embodiments thereof, the articles "a", "an", "above", and "said" are intended to mean that there are one or more elements. The terms "comprising", "including", and "having" are intended to be inclusive and mean that there may be additional elements other than the listed elements.

[0114] In view of the above, it will be seen that the several objects of the disclosure are achieved and other advantageous results attained.

[0115] As various changes could be made in the above products and methods without departing from the scope of the disclosure, it is intended that all matter in the above description shall be interpreted as illustrative and not in a limiting sense.

Claims

1. A VSFF optical fiber connector, comprising: a connector housing having a top portion and a bottom portion; a ferrule arrangement for terminating a plurality of optical fibers, the ferrule arrangement comprising one of (i) a pair of spring-loaded single-fiber ferrules and (ii) a single spring-loaded MT ferrule, the ferrule arrangement being received in a connector housing such that the optical fibers are vertically spaced apart between a top portion and a bottom portion of the connector housing; a connector locking recess configured to lock with an adapter locking arm of a first type of mating adapter; as well as The connector locking portion is configured to lock with the adapter locking recess of the second type of mating adapter.

2. The VSFF fiber optic connector according to claim 1 further includes a remote release assembly configured to (a) unlock the connector locking groove from the adapter locking arm of the first type of mating adapter, and (b) unlock the connector locking portion from the adapter locking groove of the second type of mating adapter.

3. The VSFF fiber optic connector of claim 2, wherein the remote release assembly comprises a first extension member and a second extension member, the first extension member being slidably engaged with a top portion of the connector housing, and the second extension member being slidably engaged with a bottom portion of the connector housing, wherein the remote release assembly is configured to displace rearwardly relative to the connector housing.

4. The VSFF optical fiber connector according to claim 3, wherein the connector locking groove includes an upper connector locking groove on the top portion of the connector housing and a lower connector locking groove on the bottom portion of the connector housing; wherein the connector locking portion includes an upper connector locking portion on the top portion of the connector housing and a lower connector locking portion on the bottom portion of the connector housing.

5. The VSFF fiber optic connector of claim 4, wherein the first extension piece is configured to (a) unlock an upper connector locking groove from a first type of mating adapter, and (b) unlock an upper connector locking portion from a second type of mating adapter, and wherein the second extension piece is configured to (a) unlock a lower connector locking groove from a first type of mating adapter, and (b) unlock a lower connector locking portion from a second type of mating adapter.

6. The VSFF fiber optic connector of claim 3, wherein the remote release assembly comprises a push-pull boot connected to the first extension member and the second extension member.

7. The VSFF fiber optic connector of claim 2, wherein the remote release assembly is configured to disconnect from the connector housing, rotate 180° around the cable and reconnect to the connector housing, such that the first extension member is slidably engaged with the bottom portion of the connector housing, the second extension member is slidably engaged with the top portion of the connector housing, and the VSFF fiber optic connector is switched from a first polarity configuration to a second polarity configuration.

8. A fiber optic adapter for one or more VSFF connectors, the fiber optic adapter comprising: a top wall defining an upper locking recess configured to lock with a first depressible locking portion of a first type of VSFF connector; a bottom wall defining a lower locking recess configured to lock with a second depressible locking arm of a first type of VSFF connector; as well as A pair of opposing locking arms are configured to lock with the upper locking groove and the lower locking groove of the second type of VSFF connector.

9. The fiber optic adapter of claim 8, wherein the top wall of the adapter further defines a first keyway, and the bottom wall of the adapter further defines a second keyway having a size and / or position different from the first keyway.

10. The optical fiber adapter according to claim 9, wherein along the insertion direction of the VSFF connector into the adapter, the relative locking arms are located on the inner sides of the upper locking groove and the lower locking groove, and the upper locking groove and the lower locking groove are located on the inner sides of the first key groove and the second key groove.

11. The fiber optic adapter of claim 8, wherein the opposing locking arms are located inside the upper locking groove and the lower locking groove along an insertion direction of the VSFF connector into the adapter.

12. A VSFF optical fiber connector, comprising: a connector housing having a top portion and a bottom portion; A ferrule device for terminating a plurality of optical fibers arranged in at least one row, the ferrule device comprising one of (i) a pair of spring-loaded single fiber ferrules and (ii) a spring-loaded MT ferrule, the ferrule device being received in a connector housing such that the optical fibers of the at least one row are spaced apart along a vertical line between a top portion and a bottom portion of the connector housing; A remote release assembly comprising a first extension member slidably engaged with a top portion of a connector housing and a second extension member slidably engaged with a bottom portion of the connector housing, wherein the remote release assembly is configured to be displaced rearwardly relative to the connector housing, and each extension member is configured to unlock a corresponding locking connection between the connector housing and a mating adapter when the remote release assembly is displaced rearwardly relative to the connector housing.

13. The VSFF fiber optic connector of claim 12, wherein the remote release assembly comprises a push / pull boot connected to the first extension member and the second extension member.

14. The VSFF fiber optic connector of claim 12, wherein the first extension member and the second extension member each include a respective polarity key.

15. The VSFF fiber optic connector of claim 12, wherein the first extension member and the second extension member each include a depressible locking portion.

16. The VSFF fiber optic connector of claim 12, wherein the first extension member and the second extension member each include a rearward slope.

17. The VSFF fiber optic connector of claim 12, wherein the first extension member and the second extension member are each slidably engaged with a respective one of the top portion and the bottom portion of the connector housing at a sliding dovetail connection.

18. The VSFF fiber optic connector of claim 12, wherein the remote release assembly is configured to be disconnected from the connector housing, rotated 180° about the cable and reconnected to the connector housing, such that the first extension member is slidably engaged with the bottom portion of the connector housing, the second extension member is slidably engaged with the top portion of the connector housing, and the VSFF fiber optic connector is switched from a first polarity configuration to a second polarity configuration.

19. The VSFF fiber optic connector of claim 12, wherein the first extension piece and the second extension piece each include a groove, and the VSFF fiber optic connector includes a first connector locking portion received in the groove of the first extension piece and a second connector locking portion received in the groove of the second extension piece.

20. A fiber optic adapter for one or more VSFF connectors, the fiber optic adapter comprising: a receptacle defining an opening for receiving one or more VSFF connectors, the receptacle being configured to receive a first depressible locking portion of a first type VSFF connector to releasably connect with the first type VSFF connector; as well as A locking mechanism, located in the receptacle, is configured to be releasably received in a locking recess of the second type VSFF connector so that either the first type VSFF connector or the second type VSFF connector can be received in the opening and releasably connected to the receptacle.

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