Centre for Development of Telematics

Centre for Development of Telematics (c-dot)

Centre for Development Telematics

Atul Kumar Gupta

Vipin Tyagi

Vivek Kumar

Pankaj Kumar Dalela

Prashant Kumar Rathore

Roshan Lal Sharma

Prasanta Halder

Praveen Kumar Mathur

Ashok Gupta

Kashish Anand

Prashant Bansal

Niraj Kant Kushwaha

Arun Yadav

Anurag Yadav

Ravi Gupta

The present disclosure relates to the field Quantum Key distribution (QKD) and discloses an apparatus () and method () for adjusting the phase modulator's modulating signal time reference in a phase-based QKD system. The QKD system comprises a pulse generator () that generates optical pulses and a phase modulator () that modulates the phase of each of the pulses. The apparatus () comprises abeam splitter/tap (), a 1-bit delay interferometer (), two photodetectors (), and a processing device (). The splitter feeds the phase modulated optical pulses to the interferometer (). Two photo detectors are connected to the constructive and destructive output legs () of the interferometer (). The photo detectors' output are then converted to digital signals and fed to the processing device (). The processing device () measures the average power at both the legs of the interferometer () to detect delay between optical signal and modulating signal and adjusts the delay to accurately align the phase modulator () with the pulse generator ().

Apparatus and method for adjusting the phase-modulator's modulating signal time reference in a quantum-key-distribution system

The present disclosure relates to a mirrored serial interface (MSI) for accessing peripherals through four wire serial interface. More particularly, the present disclosure is related to serial peripheral protocol with looped back mechanism in which contents of source data line are looped back onto the destination line and compared at every clock edge to ensure data sanity and to assert presence of slave and master device during and between cycles.

Method and a mirrored serial interface (MSI) for transferring data

Aspects of the present disclosure aim at configuring an optical time domain reflectometry (OTDR) in a central office such that the OTDR is configured to be operatively coupled with and also configured to periodically poll each fiber at defined intervals and compute/store a reflection signature that can be used to compare with future signatures received from subsequent polls of the fiber to determine a fault (e.g., a fiber cut or breakage) between the central office (CO) and one or more optical network unit (ONU) over GIS.

GIS based centralized fiber fault localization system

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New Delhi, India

Atul Kumar Gupta