Optical transceiver with polarity inversion
AssigneeJDS Uniphase Corporation
InventorsThomas Beck Mason, Wei-Chiao Fang
Life of this patent
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Abstract
An optical transceiver that includes a modification that prevents interoperability with standard transceivers, while enabling them to work in the same slots and equipment as standard transceivers, provided that they are interoperating with a similarly modified transceiver on the other end of the optical link. Ideally, the polarity of the data in both the transmit and receive direction is inverted resulting in valid data for a link when a pair of modified modules are used and invalid data when a modified module is used with a standard fiber optic transceiver. The function is otherwise transparent to the host equipment.
Claims26
An opto-electronic transceiver device comprising:
- a housing for mounting in a host device;
- a printed circuit board (PCB) mounted in the housing including Rx+ and Rx− inputs, and Tx+ and Tx− outputs;
- an optical input mounted on the housing for receiving an optical signal from an optical network;
- a receiver optical subassembly (ROSA) for converting the optical signal into a differential electrical signal comprising inverted Rx+ and Rx− components;
- a ROSA interconnect for transmitting the Rx+ and Rx− components from the ROSA to the Rx+ and Rx− inputs on the PCB;
- a first inverter for inverting the inverted Rx+ and Rx− components from the ROSA providing original Rx+ and Rx− components;
- an electrical connector including:
- Rx+ and Rx− output leads electrically coupled to the Rx+ and Rx− inputs on the PCB via electrical traces on the PCB for transmitting the original Rx+ and Rx− components to the host device, and
- Tx+ and Tx− input leads for transmitting a differential electrical signal from the host device including original Tx+ and Tx− components electrically coupled to the Tx+ and Tx− outputs on the PCB via electrical traces on the PCB;
- a TOSA interconnect electrically coupled to the Tx+ and Tx− outputs on the PCB for transmitting the Tx+ and Tx− components from the Tx+ and Tx− outputs;
- a second inverter for inverting the original Tx+ and Tx− components from the Tx+ and Tx− input leads on the electrical connector providing inverted Tx+ and Tx− components;
- and
- a transmitter optical subassembly (TOSA) including Tx+ and Tx− inputs electrically coupled to the Tx+ and Tx− outputs on the PCB via the TOSA interconnect for converting the inverted Tx+ and Tx− components into an optical signal, and transmitting the optical signal to the optical network.
A method for ensuring compatible optical transceivers are used in an optical link comprising:
- a) providing a first transceiver for receiving an original differential electrical signal including Tx− and Tx+ components from a first host device;
- b) inverting the Tx− and Tx+ components;
- c) converting the electrical signal into an optical signal;
- d) transmitting the optical signal over an optical waveguide;
- e) providing a second transceiver optically coupled to the optical waveguide for receiving the optical signal,
- f) converting the optical signal into a received electrical signal with Rx− and Rx+ components;
- g) inverting the Rx− and Rx+ components of the received electrical signal back to the original orientation;
- and
- h) transmitting the received electrical signal to a second host device.
Dependencies are inferred from the claim text.