https://ee.iitm.ac.in/optics/ 2026-04-04T09:43:37+0530 https://ee.iitm.ac.in/optics/ https://ee.iitm.ac.in/optics/lib/tpl/starterbootstrap/images/favicon.ico text/html 2019-03-06T10:53:06+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:cbcdrdo&rev=1551849786&do=diff Coherent Beam Combining High power lasers at the multi-kiloWatt output power level are a critical requirement for several DEW applications. Fiber lasers are an attractive choice for such laser sources as they have near-perfect beam quality (M^2< 1.1), high wall-plug efficiency, and relative ease of thermal management. However, their output power is limited to around 1 kW due to nonlinear effects as well as thermally-induced mode instabilities. Therefore, the pathway to achieving multi-kW power … text/html 2019-03-06T10:54:50+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:cbcimprint&rev=1551849890&do=diff Coherent beam combining Coherent beam combining is a key pathway to achieving 100 kW power levels required for directed energy applications. The basic building block for such beam combined systems is a narrow linewidth, nonlinearity managed kW-class laser with excellent beam quality (M^2 < 1.2). In this project, we will develop such basic building blocks (IISc) as well as demonstrate coherent beam combining of such narrow linewidth lasers (IITM) with the target of achieving >80% beam combinatio… text/html 2019-03-06T14:01:56+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:mdmfwfibers&rev=1551861116&do=diff Mode division multiplexing with Few Mode Fibers The increasing requirement of bandwidth has resulted in pushing the capacity of a single mode fiber by utilizing advanced modulation formats like QPSK and QAM in optical communication. The complexity of digital signal processing and the limitations in the achievable SNR are the challenges in these designs. The use of few-mode-fibers is considered to be the next big step towards the increase in bandwidth in long haul and access networks. In this sc… text/html 2019-12-29T16:42:43+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:micronlasersgwdetectors&rev=1577617963&do=diff LIGO-India India is going to house the third LIGO detector, at a site in Nanded, Maharashtra. IIT Madras is one of the leading experimental groups, working on different aspects of research and development for LIGO-India 2 micron lasers LIGO observatories today use highly coherent laser source at wavelength 1 µm at high power levels. Among other significant changes, advanced LIGO Voyager proposes to reduce two-photon absorption in silicon mirrors by replacing the 1 µm laser source with a 2µm… text/html 2019-03-06T10:58:07+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:narrowlinewidthfiberlasers&rev=1551850087&do=diff Mitigation of Stimulated Brillouin Scattering (SBS) for power scaling of narrow linewidth fiber amplifiers High power pulsed lasers emitting peak power levels in the order of PetaWatts (10^15 Watts) are of much interest for several applications since they have significant advantages of scale and cost. For instance, the ICAN project, in which Prof Johan Nilsson (International PI) is one of the investigators envisages the realization of PW sources through coherent beam combining of multiple chirp… text/html 2019-03-06T14:11:12+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:osp&rev=1551861672&do=diff Optical signal processing Increase in baud rates result in a corresponding overhead in the digital signal processing domain. An alternate approach is to use nonlinear effects in compact highly nonlinear media to augment the signal processing functionalities in the optical domain. All-optical logic gates, wavelength conversion and optical clock recovery has already been demonstrated in the past, for advanced modulation format. The current work is on phase conjugation, phase quantization and pho… text/html 2019-12-31T10:08:07+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:photonic_a2d_convertors&rev=1577767087&do=diff Photonic Analog-to-Digital Converters (PADC) Analog-to digital converters (ADC) play a very important role of converting the real life analog signals to digital signals in modern signal processing systems. They are widely used as principle parts for high resolution test instruments, radar systems and medical imaging systems etc. Originally, analog to-digital conversion is carried out by electronic means and involves two functions: 1) Sampling and 2) Quantization. Over the years, considerable st… text/html 2019-03-06T14:00:09+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:psamplifiers&rev=1551861009&do=diff Phase Sensitive Amplfiiers Optical amplifiers are an integral part of any commercial optical communication system. In addition to adding a specific gain, optical amplifiers add a definite noise to the signal that degrades the optical signal-to-noise ratio of the signal after amplification. When advanced modulation formats such as Polarization multiplexed QPSK and 16QAM are used for optical communication, increase in noise - especially a phase noise due to spontaneous emission in an amplifier … text/html 2019-12-29T16:51:12+0530 Anonymous (anonymous@undisclosed.example.com) https://ee.iitm.ac.in/optics/doku.php?id=photonics:projects:qkd&rev=1577618472&do=diff Quantum Key Distribution Quantum Communications encompasses some of the latest technological trends in optical communications, specific to the security of our data in transit. We rely on the quantum properties of single photons to transfer information between two parties over point-to-point links, called