Patent ID: 6462860
Filing Date: 2002-10-08
Classification: H04B,H04L

Abstract:
An apparatus for detecting a pulse position modulated optical signal comprising:a clock source providing optical clock pulses synchronized to said pulse position modulated optical signal; a continuous wave optical source producing a continuous wave optical signal; a first coherent wavelength converter, said first coherent wavelength converter having a first input responsive to said pulse position modulated signal and a second input responsive to said continuous wave optical signal and producing a first coherent pulsed output; a second coherent wavelength converter, said second coherent wavelength converter having a first input coupled to said optical clock pulses and a second input coupled to said continuous wave optical signal and producing a second coherent pulsed output; and a coherent correlator having inputs coupled to the outputs of said first coherent wavelength converter and of said second coherent wavelength converter and producing an output proportional to said first coherent pulsed output correlated with said second coherent pulse output.