Centre National De La Recherche Scientifique

Université Grenoble Alpes

Institut National De La Recherche Scientifique

Fonex Data Systems Inc.

Reza Maram

David V Plant

José Azaña

Hugues Guillet De Chatellus

Konatham Saikrishna Reddy

Kh Arif Shahriar

Pasquale Ricciardi

Md Samiul Alam

Saket Kaushal

Mauricio Tosi

Systems may include one or more directly modulated laser ('DML') optical transmitters to transmit optical signals carrying data to one or more optical receivers and include one or more filters designed to reduce the power in lower modulation levels. In various embodiments, the optical receiver includes an optical combiner to combine local oscillator light at a frequency, fLO with the optical data signal, an optical-electrical converter to downconvert the combined LO-optical signal to an electrical signal including four PAM4 frequencies, an electrical filter to attenuate the electrical power in the PAM4 frequencies by differing amounts, rectify and output the electrical signal. Systems may include extinction ratio management and thermal chirp compensation, and may include optical filters designed for chirp management with different laser parameters (α and k) and OMAs with PAM-M format in both optical and electrical domains and for use with quasi-coherent receivers (QCR) and DML transmitters.

Optical transmission systems, receivers, and devices, and methods of receiving optical signals and designing filters and filtering optical and electrical signals

A method and a system for generating a time-frequency representation of an aperiodic continuous input signal comprising generating a periodic train of short pulses having a repetition frequency, and sampling the signal temporally using the periodic train of short pulses to obtain a temporally sampled signal, the temporally sampled signal comprising a plurality of sampled copies of the input signal, each sampled copy being spaced in function of the repetition frequency of the periodic train of short pulses. The temporally sampled signal is delayed based on the repetition frequency to obtain a delayed temporally sampled signal comprising a plurality of delayed sampled copies, a spectral representation of a given delayed sampled copy being delayed in function of the repetition frequency. The delayed temporally sampled signal is evaluated over consecutive time slots to obtain, for each consecutive time slot, a respective output signal in the time-frequency domain.

Method and system for generating time-frequency representation of a continuous signal

Growing community of inventors

Montreal, Canada

Reza Maram