US 2011/0217045 A1Published application

Crosstalk mitigation in optical transceivers

AssigneeOneChip Photonics Inc.

InventorsChristopher Watson, Michael Vitic

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Abstract

The invention relates to a method of improving the performance of optical receivers within optical transceivers by compensating for crosstalk, both optical and electrical. Optical crosstalk may arise within the optical receiver from a variety of sources including directly from the optical emitter within, indirectly from the optical emitter via losses, and losses of other received wavelengths within the optical transceiver coupled to the optical receiver. Electrical crosstalk may arise for example between the electrical transmission lines of the optical transmitter and optical receiver. The method comprises providing a secondary optical receiver in predetermined location to the primary optical receiver, the optical receivers being electrically coupled such that the crosstalk induced photocurrent in the secondary optical receiver is subtracted from the photocurrent within the primary optical receiver. The method may be applicable to either monolithic and hybrid optical transceivers.

Claims24

Dependent claims

A device comprising:

an optical input port in communication with an optical network for receiving and transmitting optical signals;
a wavelength multiplexer comprising a common port optically coupled to the optical input port and characterized by at least a first predetermined wavelength range, and two channel ports of a plurality of channel ports, each channel port characterized by at least a second predetermined wavelength range, each second predetermined wavelength range being within the first predetermined wavelength range;
an optical emitter coupled to the first channel port for transmitting an optical signal to the optical input port via the wavelength multiplexer, the optical emitter operating within the second predetermined wavelength range of the first channel port;
a first photodetector coupled to the second channel port of the wavelength multiplexer for receiving optical signals from the optical input port via the wavelength multiplexer and providing a first electrical signal;
and
a second photodetector disposed in predetermined location relative to the first photodetector for providing a second electrical signal to be used in combination with the first electrical signal to improve a measure of the first electrical signal.

3 more elements

A device comprising:

an optical input port in communication with an optical network;
a wavelength multiplexer comprising a common port optically coupled to the optical input port and characterized by at least a first predetermined wavelength range, and at least one channel port of a plurality of channel ports, the channel port characterized by at least a second predetermined wavelength range, the second predetermined wavelength range being within the first predetermined wavelength range;
a first photodetector coupled to the one channel port of the wavelength multiplexer for receiving optical signals from the optical input port via the wavelength multiplexer and providing a first electrical signal;
and
a second photodetector disposed in predetermined location relative to the first photodetector for providing a second electrical signal to be used in combination with the first electrical signal to improve a measure of the first electrical signal.

2 more elements

A method comprising:

providing an optical input port in communication with an optical network and for receiving and transmitting optical signals;
providing a wavelength multiplexer comprising a common port optically coupled to the optical input port and characterized by at least a first predetermined wavelength range, and at least one channel port of a plurality of channel ports, each channel port characterized by at least a second predetermined wavelength range, each second predetermined wavelength range being within the first predetermined wavelength range;
providing a first photodetector coupled to the one channel port of the wavelength multiplexer for receiving optical signals from the optical input port via the wavelength multiplexer and providing a first electrical signal;
and
providing a second photodetector disposed in predetermined location relative to the first photodetector for providing a second electrical signal to be used in combination with the first electrical signal to improve a measure of the first electrical signal.

2 more elements

Dependencies are inferred from the claim text.