Direct current coupled data transmission
AssigneeInternational Telephone and Telegraph Corporation
InventorPhilip R. Couch
Life of this patent
Estimating the term…
Abstract
A fiber optic direct current coupled data transmission link having a response extending to dc by using a dc coupled receiver and a modified frequency response to avoid data width distortion which allows the dc coupled receiver to work over a wide range of input signal levels.
Claims10
In a data transmission link for transmitting and regenerating data, a receiving means adapted to receive a data signal and capable of providing a data output responsive to said signal, said receiving means including a frequency response shaping network having means for modifying the shape of the data signal to provide for a predetermined overshoot as the signal changes energy levels to give the data output a reduced data width distortion by providing different gains for different frequency components of said data signal with the gain increasing with frequency in the upper portion of the receiving means band and falling above such band.
A data transmission link for transmitting and regenerating data comprising transmitting means capable of receiving a data input and providing a direct current signal responsive to said input;
- receiving means coupled to said transmitting means and capable of providing a data output responsive to said direct current signal, said receiving means including a frequency response shaping network having means for modifying the shape of the data signal to provide for a predetermined overshoot as the signal changes energy levels to give the data output a reduced data width distortion by providing different gains for different frequency components of said data signal with the gain increasing with frequency in the upper portion of the receiving means band and falling above such band.
A method of providing direct current data transmission, including the following steps:
- generating an optical signal in response to data input;
- transmitting said optical signal in a predetermined path from an input to an output end;
- transforming said optical signal received at said output end into an electrical signal;
- modifying the shape of said electrical signal to provide a predetermined overshoot in the modified signal as said electrical signal changes energy levels to give the data output a reduced data width distortion by providing different gains for different frequency components of said electrical signal with the gain increasing with frequency in the upper portion of the receiving means band and falling above such band;
- comparing the modified signal to a present reference voltage;
- generating a data output resulting from said comparison.
Dependencies are inferred from the claim text.