The present application is related to U.S. application Ser. No. 10/612,886 filed on Jul. 3, 2003, entitled “Modular Media Converter”, the contents of which are incorporated herein by reference in its entirety.
The present invention relates to high speed data communications cables, and more particularly to optical fiber cables and electro-optical signal converters used for short-range coupling of information system units.
This application is related to U.S. patent application Ser. No. 11/854,319, filed on Sep. 12, 2007.
High speed data communications networks utilize optical fiber cables for data transmission between information system units such as computers, mass data storage devices, and routers. Such units typically employ electrical connectors which couple to electrical connectors associated with electrical cables. To couple such units to an optical fiber cable, an electro-optical converter or transceiver is employed which interfaces between the electrical connector and the optical fiber cable.
Examples of electrical connectors know in the prior art communications applications are illustrated in
In conventional systems, the host board is often adapted to mate with either an electrical connector plug or an optical connector plug. If the host board is adapted to mate with an electrical connector plug and a subsequent need arises to carry the signals over distances longer than those for which electrical wires, i.e., copper may be used (InfiniBand™ specification calls for copper wire to be used for distances up to 17 meters), the user may need to replace the TCA/HCA card with a card adapted to receive an optical cable so as to be able to handle optical signals, thereby increasing cost. Similarly, if the host board card is adapted to mate with an optical connector plug, and a subsequent need arises to carry the signals over a relatively shorter distances, it may be more cost effective to replace the TCA/HCA card with a card adapted to receive a copper wire so as to be able to handle electrical signals.
Accordingly, media adapters have been developed to enable optical signals carried via an optical cable to be coupled to electrical receptacles. Such media adapters include a fiber optic cable with an electrical plug coupled to on one end and an optical plug coupled to another end. The electrical plug is adapted to mate with an electrical connector receptacle on a host board and the optical plug is adapted to mate with an optical connector receptacle. The electrical signals present on the electrical receptacle are converted to optical signals by a transceiver disposed in the media adapter and carried over fiber optic cable. Conventional media adapters are connectorized and are thus relatively expensive. Furthermore, safety issues remain a concern if a user detaches the optical cable from the coupling plugs and looks at the light beams emanating from the lasers disposed therein.
Briefly, and in general terms, the present invention provides a communications cable for providing a short range, high speed data communications link between information system units including an optical fiber with an integral housing at each end having an electrical connector extending from the housing and adapted to mate with a corresponding electrical connector on an external information system unit for transferring an information signal between the cable and the unit; and a signal converter in the integral housing connected to the electrical connector for converting an information signal between an electrical signal and a corresponding optical signal. In accordance with one embodiment of the present invention, a cable assembly includes a fiber optic cable with a pair of optical connector plugs coupled to each one of its ends. The optical connector plugs are adapted to mate with two electrical connector receptacles already present on two host boards. The cable assembly thus enables communication between the electrical receptacles of the two host boards to be carried out via optical signals. In other words, the cable assembly is adapted to receive electrical signals from a first electrical receptacle—mounted on the first host board—via one of its optical connector plugs, and subsequently convert the received electrical signals to optical signals and deliver the optical signals via the fiber optic cable to the other optical connector plug. The receiving optical connector plug converts the optical signals to electrical signals and delivers the converted electrical signal to the second electrical connector receptacle mounted on the second host board.
The electrical connector receptacle has physical and electrical characteristics defined by the same standard as that defining the physical and electrical characteristic of the optical plugs. Accordingly, the same electrical receptacle on the host board may be used to receive both an electrical connector plug or the optical connector plug of the cable assembly. Accordingly, if the distance between the two electrical connector receptacles (i.e., the two host boards) is, e.g., more than 15 meters, a cable assembly, in accordance with the present invention, may be used to establish communication between the two host boards. If, on the other hand, the distance between the two host boards is, e.g., less than 15 meters, a conventional copper cable with standard electrical connector plugs may be used to establish communication between the two host boards.
Each optical plug includes, in part, an optical engine mounted on a board, a top housing shell, and a bottom housing shell. In some embodiments, the fiber optic cable is attached to the optical plugs via a strain relief boot. Because the fiber optic cable is attached to the optical plugs and may not be easily removed, the user is not exposed to safety hazards that may result from viewing the laser beams. In other embodiments, the fiber optic cable is glued to the optical plugs.
In accordance with another embodiment of the present invention, a cable assembly includes, in part, a connector plug from which a fiber optic cable and an electrical cable are fanned out. The connector plug receives and processes (e.g., amplify, filter, etc.) electrical signals from an electrical connector receptacle mounted on a host board. The processed signals that are to be transmitted via the fiber optic cable are converted to optical signals using an optical engine. The processed signals that are to be transmitted via the electrical cable may be further processed before being transmitted. In some embodiments, the signals transmitted by the fiber optic cable may be the same as those transmitted by the electrical cable and may include the entire set of the signals received from the connector receptacle. In yet other embodiments, the signals transmitted by the fiber optic cable may be different from those transmitted by the electrical cable.
In some embodiments of the present invention, the optical engines as well as the integrated circuits are powered by circuitry disposed on the host boards via the same supply voltages which power the components on the host boards. One or more of the connectors of the electrical receptacles are configured to deliver the supply voltages to the optical engines as well as the integrated circuits mounted on one or more boards disposed within the connector plug and configured to process the received electrical signals.
In accordance with one embodiment of the present invention, a cable assembly includes a fiber optic cable with a pair of optical connector plugs coupled to each one of its ends. The optical connector plugs are adapted to mate with two electrical connector receptacles already present on two host boards. The cable assembly thus enables communication between the electrical receptacles of the two host boards to be carried out via optical signals. In other words, the cable assembly is adapted to receive electrical signals from a first electrical receptacle—mounted on the first host board—via one of its optical connector plugs, and subsequently convert the received electrical signals to optical signals and deliver the optical signals via the fiber optic cable to the other optical connector plug. The receiving connector plug converts the optical signals to electrical signals and delivers the converted electrical signal to the second electrical connector receptacle mounted on the second host board.
The electrical connector receptacle has physical and electrical characteristics defined by the same standard as that defining the physical and electrical characteristic of the optical plugs. Accordingly, the same electrical receptacle on the host board may be used to receive both an electrical connector plug or the optical connector plug of the cable assembly. Accordingly, if the distance between the two electrical connector receptacles (i.e., the two host boards) is, e.g., more than 15 meters, a cable assembly, in accordance with the present invention, may be used to establish communication between the two host boards. If, on the other hand, the distance between the two host boards is, e.g., less than 15 meters, a conventional copper cable with standard electrical connector plugs may be used to establish communication between the two host boards.
In
Disposed within each plug 105 and 115 of cable assembly 100 is an electrical/optical engine (hereinafter alternatively referred to as optical engine) adapted to convert electrical signals to optical signals and vice versa. As known to those skilled in the art, each optical engine includes components such as, lasers, lenses, laser drivers, etc. The optical engine in each optical plug, e.g. optical plug 105, is adapted to receive electrical signals from its mating electrical receptacle, e.g., electrical receptacle 104, convert that electrical signal to optical signal, and thereafter deliver that optical signal via fiber optic cable 110 to the other optical plug, e.g., optical plug 115. The optical plug 115 receiving the optical signal converts the received optical signal to electrical signal and delivers the converted electrical signal to, e.g., electrical receptacle 108.
Optical plug 150 complies with the same industry standard with which host board 106 and electrical receptacle 104 also comply. For example, if host board 106 and electrical receptacle 104 are formed in accordance with InfiniBand™ specifications, optical plug 150 is also compliant with InfiniBand™ specifications. If host board 106 and electrical receptacle 104 are formed so as to comply with Host-Channel Adapter (HCA) or a Target Channel Adapter (TCA) specifications and standards, optical plug 150 is also compliant with these specifications and standards. Therefore, board 152 is formed so as to receive any standard compliant optical engine.
As described above, cable assembly 100 dispenses the need for replacing electrical receptacle 104 or host board 106 in the field if a decision is made to use an optical fiber in place of copper wires as the transmission medium. As described above, optical engine 180 may be supplied or manufactured by any commercial vendor or manufacturer so long as it complies with the same standard as that with which host board 106 or electrical receptacle 104 are also adapted to comply.
Because fiber optic cable 110 is not connectorized (i.e., fiber optic cable 110 may not be detached from the optical plugs) it provides a relatively high level of eye safety. Furthermore, because fiber optic cable 110 is not connectorized, it has improved matched ends properties, as described further below. In a conventional connectorized optical cable, a first optical engine coupled to a first end of the optical cable is required to operate with any optical engine coupled to the other end of the optical cable, notwithstanding their respective manufactures. Therefore, the first optical engine is required to function over a wide range of operating conditions, resulting in yield loss and a relatively more extensive testing. In contrast, because the two optical engines disposed at the two ends of cable assembly 100, are only required to operate with each other, they are easier two match; in other words, cable assembly 100 has matched ends. Moreover, in accordance with the present invention, because the two optical engines are matched, a higher manufacturing yield is achieved and less extensive testing of the optical engines are required.
In the embodiment shown in
It is understood that the above embodiments of the present invention are illustrative and not limitative. For example, the invention in not limited by the type of optical engine disposed in the optical plug of each end of the assembly cable. The invention is not limited by the type of circuit board, flexible or rigid, on which the optical engine is mounted. The invention is not limited by the number of channels, speed or specific electrical or optical configuration that, e.g., the optical engine is adapted to handle. Other variations, modifications, additions, deletions are obvious in light of the above disclosure and are intended to fall within the scope of the appended claims.
Number | Name | Date | Kind |
---|---|---|---|
3663822 | Uchida | May 1972 | A |
3792284 | Kaelin | Feb 1974 | A |
3794841 | Cosentino et al. | Feb 1974 | A |
4156206 | Comerford et al. | May 1979 | A |
4466694 | MacDonald | Aug 1984 | A |
4595839 | Braun et al. | Jun 1986 | A |
4704720 | Yamaguchi | Nov 1987 | A |
4767168 | Grandy | Aug 1988 | A |
4786132 | Gordon | Nov 1988 | A |
4902092 | Grandy | Feb 1990 | A |
4992754 | Blauvelt et al. | Feb 1991 | A |
5003546 | Lidgard et al. | Mar 1991 | A |
5040868 | Waitl et al. | Aug 1991 | A |
5064299 | Hirschmann et al. | Nov 1991 | A |
5109452 | Selvin et al. | Apr 1992 | A |
5161044 | Nazarathy et al. | Nov 1992 | A |
5172068 | Childs | Dec 1992 | A |
5221984 | Furuyama et al. | Jun 1993 | A |
5227736 | Tucker et al. | Jul 1993 | A |
5242315 | O'Dea | Sep 1993 | A |
5252930 | Blauvelt | Oct 1993 | A |
5257124 | Glaab et al. | Oct 1993 | A |
5424680 | Nazarathy et al. | Jun 1995 | A |
5430569 | Blauvelt et al. | Jul 1995 | A |
5436749 | Pidgeon, Jr. et al. | Jul 1995 | A |
5448661 | Takai et al. | Sep 1995 | A |
5453868 | Blauvelt et al. | Sep 1995 | A |
5485481 | Ventrudo et al. | Jan 1996 | A |
5506921 | Horie | Apr 1996 | A |
5546281 | Poplawski et al. | Aug 1996 | A |
5696861 | Schimmeyer et al. | Dec 1997 | A |
5708743 | DeAndrea et al. | Jan 1998 | A |
5717533 | Poplawski et al. | Feb 1998 | A |
5717804 | Pan et al. | Feb 1998 | A |
5812716 | Ohishi | Sep 1998 | A |
5825949 | Choy et al. | Oct 1998 | A |
5845030 | Sasaki et al. | Dec 1998 | A |
5870417 | Verdiell et al. | Feb 1999 | A |
RE36820 | McGinley et al. | Aug 2000 | E |
6122085 | Bitler | Sep 2000 | A |
6164838 | Maehara et al. | Dec 2000 | A |
6179627 | Daly et al. | Jan 2001 | B1 |
6206578 | Shin et al. | Mar 2001 | B1 |
6207950 | Verdiell | Mar 2001 | B1 |
6220873 | Samela et al. | Apr 2001 | B1 |
6246965 | Cockerham et al. | Jun 2001 | B1 |
6252693 | Blauvelt | Jun 2001 | B1 |
6356679 | Kapany | Mar 2002 | B1 |
6373644 | Flanders | Apr 2002 | B1 |
6416937 | Flanders et al. | Jul 2002 | B1 |
6446867 | Sanchez | Sep 2002 | B1 |
6517382 | Flickinger et al. | Feb 2003 | B2 |
6535315 | Way et al. | Mar 2003 | B1 |
6538789 | Sun | Mar 2003 | B2 |
6553166 | Caldwell | Apr 2003 | B1 |
6661814 | Chapman et al. | Dec 2003 | B1 |
6661815 | Kozlovsky et al. | Dec 2003 | B1 |
6729774 | Rast et al. | May 2004 | B1 |
6758693 | Inagaki et al. | Jul 2004 | B2 |
6913400 | O'Toole et al. | Jul 2005 | B2 |
6974262 | Rickenbach | Dec 2005 | B1 |
6975784 | Xu et al. | Dec 2005 | B1 |
7083336 | Kim et al. | Aug 2006 | B2 |
7095914 | Xu et al. | Aug 2006 | B2 |
7101090 | Cheng et al. | Sep 2006 | B2 |
7114859 | Tuohimaa et al. | Oct 2006 | B1 |
7194167 | Barbarossa et al. | Mar 2007 | B2 |
7217040 | Crews et al. | May 2007 | B2 |
7272277 | Ruiz | Sep 2007 | B2 |
7295590 | Crews | Nov 2007 | B2 |
7333695 | Xu et al. | Feb 2008 | B2 |
7352969 | Kim et al. | Apr 2008 | B2 |
7373031 | Wang et al. | May 2008 | B2 |
20050089281 | Chiu et al. | Apr 2005 | A1 |
20050117913 | Hung et al. | Jun 2005 | A1 |
20060067064 | Crews et al. | Mar 2006 | A1 |
20060067630 | Kim | Mar 2006 | A1 |
20060067690 | Tatum et al. | Mar 2006 | A1 |
20060133820 | Wang et al. | Jun 2006 | A1 |
20060133821 | Wang et al. | Jun 2006 | A1 |
20060147214 | Ruiz et al. | Jul 2006 | A1 |
20080175547 | Wang et al. | Jul 2008 | A1 |
Number | Date | Country |
---|---|---|
1048965 | Nov 2000 | EP |
1048965 | Dec 2000 | EP |
Number | Date | Country | |
---|---|---|---|
20060088251 A1 | Apr 2006 | US |