A team of researchers led by IIT Guwahati faculty Dr. Bosanta Ranjan Boruah and Dr. Santanu Konwar developed a novel free-space optical communication system for information transfer.

In free-space communication, data in the form of voice, text or image is transmitted using light wirelessly rather than through optical fibres and it represents the next generation of communications technology.

IIT Guwahati scientists develop great optical communication system

The past couple of decades have seen phenomenal developments in free-space communication.

Most free-space communication systems developed so far all over the world use a type of light beam called the vortex beam to encode the data.

The problem in the use of a vortex beam is that it can be distorted by turbulence that may occur in the medium of propagation.

In effect, data transmitted wirelessly using light/laser beams, can become corrupted when transmitted through atmospheric turbulence such as wind.

To overcome this problem, the IIT Guwahati researchers have, for the first time, used orthogonal spatial light modes called Zernike modes to encode the data and to transmit the same robustly in the form of the phase profile of a laser beam.

Explaining the technicality of the research, Dr. Bosanta Ranjan Boruah of IIT Guwahati said in their work, the transmission station modulates the phase profile of a laser beam that carries the data, in terms of the strengths of a few Zernike modes.

In the process we also enhance the information content per modulation cycle of the laser beam, he said.

At the point of reception, the laser beam with encoded user information is sensed by a specially designed wavefront sensor that decodes the user information.

In this communication system, a unique mechanism has been implemented that can compensate for the effect of atmospheric turbulence, so that the user information can be transmitted even through turbulent atmosphere resulting in negligible error at the receiving station, says Dr. Boruah of IIT Guwahati.

With prior knowledge about the strength and types of Zernike modes used, which make it more secure than wired and other conventional wireless forms of communication, he said.

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Furthermore, the transmission is directed strictly towards the receiver, unlike other wireless forms of communication in which the information is transmitted in all directions, adding to the security of the communication, says the researcher.

The research team comprising IIT Guwahati faculty and team of other researchers demonstrated the distortion-free transmission of text messages and images over a distance of one kilometre even in the presence of turbulence such as during a stormy weather.

The communication system can thus be used for high speed and secured communication between two individuals located either inside a building or outside.

IIT Guwahati established in 1994 has completed 25 years of glorious existence in 2019. 

At present, the Institute has eleven departments and five interdisciplinary academic centres covering all the major engineering, science and humanities disciplines, offering BTech, BDes, MA, MDes, MTech, MSc and PhD programmes.

IIT Guwahati offers a residential campus to 412 faculty members and more than 6,000 students at present.

Besides its laurels in teaching and research, IIT Guwahati has been able to fulfil the aspirations of people of the North East region to a great extent since its inception in 1994.

The picturesque campus is on a sprawling 285 hectares plot on the north bank of the Brahmaputra, around 20 kms from the heart of the Guwahati city.

The schedule to submit applications for JEE Advanced 2025 has been announced along with that of AAT 2025 registration,

Application process for AAT starts after result declaration of JEE Advanced. This year too, the trend is no different.

Who will conduct AAT 2025?

AAT 2025 will be conducted by IIT Kanpur and is expected to see a participation in impressive numbers. The same institution is conducting JEE Advanced 2025.

Details about the exam are available on the official website mentioned above. Students who pass AAT 2025 will be able to study BArch in IIT Roorkee, IIT Kharagpur and IIT (BHU) Varnasi.

Who can take up AAT 2025 registration?

Students who have passed JEE Advanced 2025 with required qualifying marks can take up AAT 2025 registration. Applying for JEE Advanced requires a pass in JEE Mains.

Candidates who have passed plus two with maths, physics and chemistry as subjects will be able to take up JEE Mains registration. The process to take up JEE Advanced AAT 2025 registration is online.

1. The URL has to be typed into the browser and the webpage has to be allowed to download.

2. Once the website is available, students should click the link for JEE Advanced AAT 2025 registration and enter JEE Advanced 2025 registration number, their date of birth, mobile number and email address.

3. Post providing the above details, applicants will be asked if they are interested in AAT. Students have to answer ‘Yes’ to take up JEE Advanced AAT 2025 registration.

4. Candidates have to provide the required information and choose the centers where they wish to write the exam and submit the form.

5. They will receive message indicating successful completion of JEE Advanced AAT 2025 registration.

The message has to be downloaded and a printout of it has to be taken and preserved for use in future. This could be of use during the admission process.

Website for JEE Advanced 2025/AAT 2025 Registration is Here

Exam pattern

Candidates who have completed JEE Advanced AAT 2025 registration must also know the exam pattern if they are to score good marks.

Those who have taken up AAT 2025 registration can take up the exam which will be held in offline mode, as a pen and paper mode test.

Candidates will have three hours time to answer all the questions. The medium of the test is English.

The sections in the question paper are – Imagination and aesthetic sensitivity, three dimensional perception, Geometrical drawing, Freehand drawing and Architectural Awareness.

Syllabus for AAT 2025

The next thing to do after completing AAT 2025 registration is focus on preparing for the test.

The subjects to be studied while preparing for AAT 2025 are mentioned below. Candidates can also refer the official website for more information on syllabus when the registration for the exam begins:

Geometrical Drawing

Exercises in geometrical drawing containing lines, angles, triangles, quadrilaterals, polygons, circles, etc. Study of plan (top view), elevation (front or side views) of simple solid objects like prisms, cones, cylinders, cubes, splayed surface holders, etc.

Freehand Drawing

This would comprise of simple drawing depicting the total object in its right form and proportion, surface texture, relative location and details of its component parts in appropriate scale.

Common domestic or day-to-day life usable objects like furniture, equipment, etc., from memory.

Three dimension perception

Understanding and appreciation of three-dimensional forms with building elements, colour, volume and orientation. Visualization through structuring objects in memory.

Architectural Awareness

General interest and awareness of famous architectural creations – both national and international, places and personalities (architects, designers, etc.) in the related domain.

Imagination and Aesthetic Sensitivity

Composition exercise with given elements. Context mapping.

Creativity check through innovative uncommon test with familiar objects. Sense of colour grouping or application.

The medium of the test is English. The sections in the question paper are – Imagination and aesthetic sensitivity, three dimensional perception, Geometrical drawing, Freehand drawing and Architectural Awareness.

The admit cards obtained for JEE Advanced 2025 can also be used to gain entry into the test centers for AAT 2024.

Point to remember

Candidates can visit the official website of JEE Advanced exam for more information on JEE Advanced AAT 2025 registration and other related topics.

The students have to quickly take up the AAT 2025 registration as the time left would be very short.

Like JEE Advanced exam where the registration is open for a longer duration, that of AAT 2025 registration is open for only a short period.

The details about AAT 2025 registration provided above are for general understanding purpose of the students.

There could be some changes in the exam, students can visit the official website of the exam at regular intervals to receive updates.

More information could be provided as the time for AAT 2025 registration would commence, till that time, students can refer other sources also.

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