System and Method for Filtering an Optical Signal to Avoid Fading and to Optimize Linearity

摘要

A system for transmitting an optical signal over a fiber optic includes a terminal for generating the optical signal. Due to its modulation, the optical signal includes a carrier having a wavelength “λ”, with an upper sideband and a lower sideband. A tuner is connected with the terminal to adjust the wavelength “λ” of the carrier of the optical signal relative to a band pass filter. The purpose here is two-fold. For one, this adjustment eliminates a sideband of the optical signal, to avoid fading, and it suppresses the carrier of the optical signal, to enhance the OMI while maintaining the linearity of the signal.

主权项

1. A system for filtering an optical signal for transmission of the signal over a fiber optic which comprises:
a terminal for generating the optical signal, wherein the optical signal includes a carrier having a wavelength “λ”, with an upper sideband and a lower sideband; a filter defined by a pass band limit, wherein the limit establishes a transmit decibel (dB) level based on changes in wavelength and is characterized by a central region with a substantially flat pass band limit located between a lower region with a positively sloped pass band limit, and an upper region with a negatively sloped pass band limit; and a tuner connected with the terminal for positioning the carrier in a preselected region of the filter having a sloped pass band limit to eliminate a sideband of the optical signal to avoid fading, and to suppress the carrier to enhance the Optical Modulation Index (OMI) for the optical signal.