Transmitter Frequency Peaking for Optical Fiber Channels
AssigneeClariPhy Communications, Inc.
InventorsThomas A. Lindsay, Norman L. Swenson
Life of this patent
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Abstract
Frequency peaking is used in the transmitter to improve link performance. In one example, frequency peaking improves the PIED or TWDP. The frequency peaking can result in pulse shapes that have more electrical energy in the receiver (and therefore higher received SNR) than uncompensated pulses. In addition, due to the response of typical fibers, boosting the high frequencies typically will flatten the received spectrum, which will improve the performance of the equalizer in an EDC receiver.
Claims19
An optical transmitter for transmitting data over an optical fiber at a specified data rate, wherein the optical transmitter comprises:
- a laser that exhibits relaxation oscillation;
- and
- a laser driver coupled to drive the laser, the laser driver adapted to utilize the laser relaxation oscillation to boost the peak frequency relative to a DC frequency;
- wherein the laser produces an optical signal that encodes the data and is suitable for transmission over the optical fiber, and the optical signal has a frequency spectrum that has a relative peak at a peak frequency located in a vicinity of a line rate and the relative peak is relative to a reference frequency spectrum of a reference optical signal produced by an ideal rectangular pulse transmitter encoding the data.
A method for transmitting data over an optical fiber at a specified data rate, the method comprising:
- receiving the data;
- and
- producing an optical signal that encodes the data and is suitable for transmission over the optical fiber, wherein the optical signal has a frequency spectrum that has a relative peak at a peak frequency located in a vicinity of a line rate and the relative peak is relative to a reference frequency spectrum of a reference optical signal produced by an ideal rectangular pulse transmitter encoding the data, wherein the step of producing the optical signal comprises utilizing a laser relaxation oscillation to boost the peak frequency relative to a DC frequency.
Dependencies are inferred from the claim text.