Method, system and apparatus for optically receiving information
AssigneeTeradvance Communications, LLC
InventorsMarcel F.C. Schemmann, Zoran Maricevic, Antonije R. Djordjevic
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Abstract
An optical signal is transmitted and received from an optical wave guide, the optical signal including an in-phase (I) component, a quadrature (Q) component and a carrier signal, and converted to an electrical signal. The electrical signal is phase-filtered to compensate for dispersion and phase locked.
Claims84
A method of receiving digital information from an input optical signal, comprising:
- receiving an optical signal containing digital information, wherein the optical signal comprises an in-phase (I) component, a quadrature (Q) component and a carrier signal;
- and
- phase locking the I component and the Q component.
A receiver for receiving digital information from an optical signal, comprising:
- an optical receiver for receiving an optical signal, comprising an in-phase (I) component, a quadrature (Q) component and a carrier signal;
- and
- a phase lock for locking the I component and the Q component.
A receiver for receiving digital information from an optical signal, comprising:
- an optical receiver for receiving an optical signal, comprising an in-phase (I) component, a quadrature (Q) component and a carrier signal, and generating an electrical signal representative thereof;
- a phase filter for dispersion compensation of the electrical signal;
- an IQ demodulator for separating the I component from the Q component, wherein each of the I component and the Q component includes a Direct Current (DC) portion and a Radio Frequency (RF) portion;
- a bias-T element for each of the I component and the Q component to separate the DC portion from the RF portion;
- a local oscillator for providing a reference signal to the IQ demodulator;
- and
- a reference signal generator for providing a reference signal to the local oscillator based on the DC portion of each of the I component and the Q component.
Apparatus to compensate for optical signal dispersion from an optical wave guide of known length, comprising a phase filter having a group delay substantially opposite that of the optical wave guide.
A method of compensating for dispersion of an optical signal from an optical wave guide of known length, comprising applying additional dispersion having a group delay substantially opposite that of the optical wave guide.
A system for optically transferring information, comprising:
- a transmitter for transmitting an optical signal comprising a carrier signal, an in-phase (I) component and a quadrature (Q) component;
- an optical wave guide for transferring the optical signal;
- and
- a receiver, comprising:
- an optical receiver for receiving the optical signal;
- and
- a phase lock for locking the I component and the Q component.
Dependencies are inferred from the claim text.