초록 ▼

An optical fiber communications link which by means of pulse-width-modulation (PWM) encoding supports either synchronous or asynchronous data transmission and operation over a wide range of data rates. The link utilizes a PWM encoder which accepts either synchronous (clock plus data) or asynchronous

An optical fiber communications link which by means of pulse-width-modulation (PWM) encoding supports either synchronous or asynchronous data transmission and operation over a wide range of data rates. The link utilizes a PWM encoder which accepts either synchronous (clock plus data) or asynchronous (data only) binary inputs and generates a PWM encoded waveform. This waveform is transmitted via an optical transmitter, optical channel (e.g., fiber optics) and optical receiver to the PWM decoder which reconstructs the binary inputs. The optical receiver contains a receiver circuit for assuring automatic gain control regardless of the duty cycle. In the synchronous mode of operation the unsymmetrical clock output is restored to symmetry by using a clock symmetry restoration technique.

대표청구항 ▼

A circuit for receiving pulse width modulated data signals in an optical fiber communications system comprising: means for amplifying a pulse width modulated signal; means for comparing the amplified pulse width modulated signal with a reference quantity and means connected to said pulse amplifying

A circuit for receiving pulse width modulated data signals in an optical fiber communications system comprising: means for amplifying a pulse width modulated signal; means for comparing the amplified pulse width modulated signal with a reference quantity and means connected to said pulse amplifying means for limiting the peak value of the amplified pulse width modulated signal, said limiting means including means connected to an output of said comparing means for adjusting the duty cycle of the amplified pulse width modulated signal.