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20th July 2024: Paper publication in Optics Express Journal.

We congratulate Ms. Pratyasha Priyadarshini and the co-authors (Dr. Arnab Goswami, Mr. Ashitosh Velamuri and Prof. Bijoy Krishna Das) on the publication of the paper, titled "Distributed Bragg Reflector Based ASE Noise Removal Pump Wavelength Filters for Futuristic Chip-Scale Quantum Photonic Circuits" in Optics Express.
For the full-scale integration of an integrated quantum photonic processor, it is essential to remove the broadband noise originating from amplified spontaneous emission within the chip. The major challenge lies in designing an ultrabroad passband filter with a high out-of-band rejection ratio. To address this challenge, the team developed a novel design for a compact tunable distributed Bragg reflector-based cavity.
This device, with a length as short as ~35 µm, exhibits a rejection band as wide as ~60 nm with an extinction ratio of ~40 dB relative to the resonant wavelength peak at λr ~1550 nm. The noise associated with an amplified pump wavelength (λp ~1550 nm) is suppressed down to the detector noise floor.

For more details, you can find the full publication: Distributed Bragg reflector based ASE noise removal pump wavelength filters for futuristic chip-scale quantum photonic circuits


19th June 2024: Poster Presentation at the ECIO 2024 in Aachen, Germany.

Congratulations to Mr. Arnab Goswami for poster presentation of the paper 'Silicon Photonic Wafer-Scale Yield of Single Mode Resonator with Broadband DBR Mirrors' at the European Conference on Integrated Optics (ECIO) 2024 in Aachen, Germany.
Bragg grating-based devices have wide-ranging applications in filtering, switching, modulation, sensing, and more. While e-beam-based fabrication is reliable for creating Bragg gratings, the absence of Bragg devices in the device library of commercial silicon photonics (using Deep UV) PDK has hindered large-scale adoption.
In a successful collaborative effort between SilTerra Malaysia Sdn. Bhd. and Silicon Photonics CoE-CPPICS IIT Madras, we have made significant strides in integrating distributed Bragg grating-based broadband devices into the PDK of a commercial silicon photonics foundry like Silterra.
We extend our gratitude to all the co-authors, Pratyasha Priyadarshini, Gan Yih Loong, Chew Yan Ng, Prof. Deleep Nair, Prof. Anjan Chakravorty, and Prof. Bijoy Krishna Das who made this possible.


24th May 2024: IIT Madras Silicon Photonics CoE-CPPICS partners with SilTerra Malaysia for Joint development of programmable silicon photonic processor chips

The Silicon Photonics Centre of Excellence - Centre for Programmable Photonic Integrated Circuits and Systems (Silicon Photonics CoE-CPPICS) at Indian Institute of Technology Madras (IIT Madras) is partnering with SilTerra Malaysia Sdn. Bhd. for Joint development of programmable silicon photonic processor chips, especially for quantum computing and communication system level applications.
The other key aspects of the partnership will be joint R&D on novel silicon photonic devices and circuits for energy efficient high-speed interconnect solutions for data centres, high-performance computing, and for AI/ML applications.
SilTerra Malaysia Sdn. Bhd., a global semiconductor foundry has been continuously innovating to bring leading-edge semiconductor solutions to transform the world through its disruptive silicon photonics process technologies. The Silicon Photonics CoE-CPPICS team at IIT Madras, India, is committed with its resources to enrich Silicon Photonics PDK libraries for SilTerra Silicon Photonics Foundry for mutual benefits.
An MoU towards this collaboration has been signed recently by Prof. Manu Santhanam, Dean (Industrial Consultancy and Sponsored Research), IIT Madras and Dr. Albert Pang Shu Koon, CEO at SilTerra Malaysia Sdn. Bhd. Other signatories include Prof. Bijoy Krishna Das, Chief Investigator of Silicon Photonics CoE-CPPICS and Mr. Thung Beng Joo, Vice President of Emerging Technologies Department, SilTerra Malaysia Sdn. Bhd.

For more click on this link


16th-18th May 2024: CoE-CPPICS organized a brainstorming internal workshop on Silicon Photonics Enabled Quantum Photonics Circuits and Systems

We recently organized a brainstorming internal workshop on Silicon Photonics Enabled Quantum Photonics Circuits and Systems (SPEQCS), during 16th-18th May. The primary objective was to form a solid consortium and create an ecosystem for the development of futuristic chip-scale quantum photonic solutions.
We were honored to host distinguished speakers, including Prof. Sibasish Ghosh (IMSc, Chennai), Dr.Natarajan Venkatachalam (SETS Chennai), Dr. Prem Laxman Das (SETS Chennai) and faculty members from Indian Institute of Technology, Madras: Prof. Bijoy Krishna Das, Prof. Avhishek Chatterjee, Prof. Anjan Chakravorty, Prof. Deleep Nair and Prof. Janakiraman Viraraghavan. We also had the pleasure of welcoming our industry collaborator, Mr. Dinanath Soni (Executive Director, iZMO Microsystems Pvt. Ltd).
Our chief investigator, Prof. Bijoy Krishna Das inaugurated the workshop by sharing the vision of our consortium. Experts articulated their contributions and insights throughout the event, creating a collaborative and innovative atmosphere. We were delighted by the participation of scientists and research scholars from IMSc, SETS and IIT Madras.


18th April 2024: Paper Presentation at the IEEE Silicon Photonics Conference 2024, Tokyo, Japan.

Our team had the privilege of presenting three impactful posters, showcasing the latest advancements in our silicon nitride based waveguide technology, particularly in the areas of microwave and quantum photonic applications. We are delighted by the response from the international silicon photonics community, recognizing India's progress in the journey from device fabrication to system-level applications.
Congratulations to Ms. Pranita Kumari Swain for her paper titled 'A Cladding Modulated Distributed Bragg Filters in Single Mode Silicon Nitride Waveguide'. This work highlights the importance of the gap between the waveguide core and grating structure in a rib waveguide as a key parameter for achieving sub-nanometer bandwidth with moderate extinction of the DBR filter characteristics. This design is very much useful for on-chip LASER and sensor applications.
Congratulations to Anushka Tiwari for the paper 'A Compact and High-Q Value SiN Microring Resonator for Microwave Photonic Applications'. We achieved a high Q of 1.7 million in a compact multimode rib waveguide based microring and demonstrated tunable microwave photonic bandpass filters (10 - 20 GHz) with a narrow bandwidth of 360 MHz. Additionally, our work showcased the generation of RF signals based on an optoelectronics oscillator loop with a tunable frequency range of 8 - 12 GHz and an impressive sidemode suppression ratio of 42 dB.
Congratulations to Arnab Goswami for his paper 'A SiN Photonic Integrated Circuit for Pump Laser Suppressed Nonlinear Signal Generation'. Through LPCVD of SiN, we developed a 100 mm wafer and demonstrated stimulated Four Wave Mixing in a microring resonator, followed by pump rejection using a specially designed single sidewall multimode Bragg extinction. The attained pump rejection from a single stage DBR exceeds 65 dB, representing a substantial advancement from current demonstrations and greatly benefiting the development of quantum photonic processors.


28th March 2024: Paper Presentation at the OFC 2024 in San Diego, California, USA.

Congratulations to our research scholar Mr. Ashitosh Velamuri for delivering an oral presentation on the paper titled "Integrated Photonic Microring Resonator for FSR Dependent Microwave Bandpass Filters" at OFC 2024 in San Diego, USA. The presentation showcased the successful demonstration of a microwave bandpass filter with symmetric out-of-band rejection using only a single microring resonator, offering a tunable filter bandwidth of 1.4 - 4.5 GHz at the desired center frequency (Ku Band ~ 15 GHz). This device has promising potential for multi-band radar applications.
We extend our heartfelt gratitude to Dr. K V Reddy (Pritel Inc.) for his invaluable support and encouragement to Ashitosh Velamuri during his visit to the USA. As an esteemed alumnus of IIT Madras, Dr. Reddy has consistently shown his affection towards our institution. We thank Dr. Reddy for his continued support to our center of excellence.


13th March 2024: Dr. Sandip Chatterjee (Sr. Director, Ministry of Electronics and Information Technology, Govt of India) visit to CoE-CPPICS

We were honored to host Dr. Sandip Chatterjee (Sr. Director, Ministry of Electronics and Information Technology, Govt of India) at our silicon photonics center of excellence, which was funded by MeitY under his leadership. During his visit, we demonstrated live experiments on programmable photonic chips for integrated microwave and quantum photonic applications. We showcased our in-house fiber array attachment facility where our packaging team (ANKAN GAYEN, Dr. NAGARAJAN Nallusamy, Dr. Shamsul Hassan, Vinoth subramanian, Dr. Goutham Ezhilarasu) demonstrated fiber array attachment to a programmable photonic IC. His insights inspire our drive for continuous advancements in R&D efforts for the cutting-edge technology solutions. Here are a few glimpses during his lab tour.


5th March 2024: Paper Presentation at the IEEE EDTM 2024 in Bangaluru, India.

Congratulations to our research scholars Arnab Goswami and Ankan Gayen for presenting our advancements in the area of integrated quantum photonics and photonic chip packaging at IEEE Electron Devices Technology and Manufacturing 2024 in Bengaluru , India. Arnab presented the paper titled 'Bistable Photon Pair Generation in Silicon Microring Resonator Integrated with Pump Rejection Filter,' while Ankan discussed our work on 'A Robust and Low-cost Fiber-optic Array Attachment Solution for Silicon Photonics Chips with Large Number of Input/Output Channels.'


28th January 2024: Welcoming Dr. Albert Pang (CEO of SilTerra Malaysia) as our distinguished Industry Advisory Board member.

We are pleased to announce that Dr. Albert Pang, CEO of SilTerra Malaysia Sdn. Bhd. has joined in CPPICS Industry Advisory Board as one of the distinguished members. Team CoE-CPPICS will be greatly benefitted from his immense experience and leadership in the field of semiconductor industries. We are looking forward to a stronger R&D collaboration with SilTerra for the development of advanced silicon photonics technologies.


11th January 2024: PSA between IIT Madras and Keysight Technologies for Electronics and photonics design automation (EPDA) .

We are delighted to announce that our silicon photonics CoE-CPPICS, Indian Institute of Technology, Madras and Keysight Technologies have agreed to develop compact modelling of silicon photonics components for electronics and photonics design automation (EPDA). Today, we had a kickoff review meeting with Keysight delegates Mr. Mohit Khanna (R & D Manager - EDA SW Engineering) and Mr. Soumya Dey (Senior R & D Manager). Our expert team , Prof. Bijoy Krishna Das, Prof. Anjan Chakravorty, Prof. Deleep Nair, CTO Mr. Arnab Goswami and other team members (Dr. Shamsul Hassan, Mr. Ashitosh Velamuri, Ms. Suvarna Parvathy, Mr. Pawan Kumar, Ms. Shruti Pandey, Ms. Anjana James, Mr. Dibyanchal Sahu, Mr. Mayukh Mandal) discussed project progress and future action plan.


20th October 2023: Inauguration of our Silicon Photonics CoE-CPPICS Research Centre.

We are delighted to announce the inauguration of our Silicon Photonics Centre of Excellence, graced by the esteemed Shri S Krishnan, Secretary of the Ministry of Electronics and Information Technology (MeitY). This event was further graced by the august presence of Prof. Kamakoti Veezhinathan, Director of IIT Madras and other distinguished individuals, including Smt. Sunita Verma, Scientist G and R&D Group Coordinator (MeitY), Dr. Sankha dip Das, Scientist D (MeitY), Prof. Nagendra Krishnapura (Head of the Department of Electrical Engineering, IIT Madras), Dr. Kishore Kamath, (Vice President of R&D silicon photonics product division, Intel, USA), Dr. Ravi Bhatkal (Managing Director of India Element Solutions Inc, India), Mr. Dinanath Soni (Executive Director of izmo Microsystems, India).
Prof. Bijoy Krishna Das, Chief Investigator, Silicon Photonics CoE-CPPICS, IIT Madras, mentioned, "The Silicon Photonics CoE-CPPICS is forging critical partnerships including a strong collaboration with M/s izmo Microsystems in Bengaluru, to deliver state-of-the-art System-in-Package solutions for silicon photonic processor cores. This transformative technology is primed to cater to a wide array of sectors, including quantum computing, quantum communication, 5G/6G communications, IoT, radar, avionics, and more. The nation is looking forward to witnessing the success of CPPICS as it takes this technology to full commercialization and spearheads PIC manufacturing in India. Team CoE-CPPICS has tied-up with SilTerra Malaysia Sdn. Bhd. Silicon Photonics Foundry, Malaysia for wafer scale yield testing of some novel silicon photonic devices already demonstrated using in-house technology at IIT Madras. The team has also signed a MoU with Keysight Technologies USA for joint R&D activities in the area of Silicon Photonics technology".
CoE-CPPICS Inauguration Ceremony


31st July 2023: Welcoming Dr.Kishore Kamath (Vice President at Intel Corporation (Silicon Valley) as our distinguished Industry Advisory Board member.

We are delighted to announce that Dr. Kishore Kamath, Vice President at Intel Corporation (Silicon Valley) has graciously joined our Industry Advisory Board! With his invaluable expertise and guidance, we are confident in our ability to address industry-relevant challenges more effectively.


29th July 2023: SemiconIndia 2023 exhibition in Gandhinagar, Gujarat.

We are proud to have been a part of the prestigious SemiconIndia 2023 exhibition being held in Gandhinagar, Gujarat, from 25th to 30th July 2023. The initiatives taken by the Indian government to strengthen the semiconductor ecosystem in the country are truly commendable. It is through such support and encouragement that indigenous innovations thrive and pave the way for a brighter and self-reliant future. The collective efforts of every individual play a pivotal role in shaping the technological landscape of our nation.


23rd July 2023: Workshop on Advances in Optical Communications at IITM Research Park.

We were part of the exhibition that showcased our cutting-edge integrated photonics research activities. Our team had the opportunity to demonstrate our work in the areas of programmable photonics, microwave photonics, and quantum photonics, offering a versatile range of applications. One of the highlights of the event was presenting our in-house developed technology for silicon nitride photonics and photonic chip packaging to the honorable Union Minister of State for Communications, Shri Devusinh Chauhan.


21st July 2023: In the process of transferring this technology to our industry collaborator izmo Microsystems.

We have successfully developed cutting-edge technology for photonic chip packaging. We are delighted to share that we are currently in the process of transferring this technology to our industry collaborator izmo Microsystems, Bengaluru. This in fact marks a significant step forward in advancing the capabilities of silicon photonic chip packaging for various applications.


18th July 2023: Hosting our esteemed industry advisory board chairman, Dr. Mallik Tatipamula (CTO, Ericsson Silicon Valley) at our CPPICS facilities.

We had the honor of hosting our esteemed industry advisory board chairman, Dr. Mallik Tatipamula (CTO, Ericsson Silicon Valley) at our CPPICS facilities. His captivating seminar on Transitioning towards 6G drew a whole house and provided invaluable insights into the technology constructs and architectural considerations for transitioning from 5G to 6G. Attendees gained a comprehensive understanding of the trustworthy system vision and the 6G timeline, extending into the 2030s.


15th July 2023: Visit to the Electronics and Telecommunications Research Institute (ETRI) in South Korea.

Our Chief Investigator Prof. Bijoy Krishna Das and Chief Technology Officer Arnab Goswami had the privilege of exploring potential research collaboration with Dr. JongMoo Lee who has been leading integrated quantum photonics Research at ETRI. On the 1st day of their visit, they engaged in stimulating discussions on various quantum photonics circuit designs, measurements, and their application opportunities. The very next day, Arnab got a chance to join Dr. Lee in his experiments and deepened his understanding and appreciation for the groundbreaking work being conducted at ETRI.


14th July 2023: Paper Presentation at the Optica Advanced Photonics Congress 2023 in Busan, South Korea.

Heartiest Congratulations to our research Scholars, Suvarna Parvathy, and Arnab Goswami, for presenting their papers at the Optica Advanced Photonics Congress 2023 in Busan, South Korea. Suvarna discussed the paper titled Temperature Dependent Performance Analysis Near Critical Coupling Microdisc versus Microring Resonators and Arnab, on the other hand, talked about the paper titled Programmable Silicon Photonic Microring Resonator for Nonlinear Applications.


27th June 2023: Dr.Raghu Narayan's (Principal Engineer in the Silicon Photonics Products Division at Intel) visit to Coe-CPPICS .

We had the privilege of hosting Dr. Raghu Narayan, Principal Engineer in the Silicon Photonics Products Division at Intel, in our esteemed center of excellence. Dr. Narayan delivered an insightful seminar on Intel's cutting-edge optical interconnect technologies for data center networks.


11th May 2023: Paper presentation by Mr.Ashitosh Velamuri at Conference on Lasers and Electro-Optics (CLEO) 2023 in San Jose, California, USA.

Congratulations to our research scholar, Ashitosh Velamuri, on presenting his work at the Conference on Lasers and Electro-Optics (CLEO) 2023 in San Jose, California, USA. The paper titled "Integrated Programmable Microwave Photonic Bandpass Filter with #research Symmetric Rejection" reports on the demonstration of a novel optical signal processing scheme based on the cascaded ring resonators. This scheme was used to achieve a tunable and reconfigurable microwave photonic bandpass filter with symmetric rejection.


24th April 2023: Delegates from Keysight Technologies visited CoE-CPPICS to discuss potential collaboration opportunities .

We are delighted to share that delegates (Niels Fache, Soumya Dey, Mohit Khanna) from Keysight Technologies visited our center to discuss potential collaboration opportunities. Our chief investigator Prof. Bijoy Krishna Das, co-investigators Prof. Anjan Chakravorty, Prof. Deleep Nair, Prof. Janakiraman Viraraghavan, and CTO Arnab Goswami had an engaging and informative discussion on how our center and Keysight can work together to create innovative solutions.


21st April 2023: Mr. Kailash Narayanan's (President, Communications Solutions Group, Keysight Technologies) visit to CoE-CPPICS .

We had the pleasure of welcoming Mr. Kailash Narayanan (President, Communications Solutions Group) from Keysight Technologies to our lab today! It was a great experience to hear his insights and perspectives on our research topics. We look forward to continuing our collaboration and exploring new opportunities to work together.


20th April 2023: Paper presentation by Ms.Pratyasha Priyadharshini at European Conference on Integrated Optics (ECIO) University of Twente, Netherlands.

Congratulations to our research scholar Pratyasha Priyadarshini for delivering a successful presentation of our paper entitled, "Thermo-Optically Tunable DBR Resonator with Ultra-Broad Rejection Band for Silicon Photonic Applications" at the European Conference on Integrated Optics (ECIO), University of Twente, Netherlands. We are very impressed with your achievement and look forward to many more successes in the future. Well done!


19th January 2023: 1st CPPICS Industry Advisory Board Meeting

Team CoE-CPPICS is delighted to share the news of the formation of its industry advisory board. The kick-off meeting of our CPPICS Industry Advisory Board was held on19th January (Online). The meeting went on for more than an hour, discussing the present financial status, ongoing R&D activities, industry collaborations, and future activities. Honorable Director of Indian Institute of Technology, Madras Prof. Kamakoti Veezhinathan mentioned in his opening remarks that he is delighted to see such high profile industry leaders have come forward to support CoE-CPPICS and he is grateful to all of them.


PICS Today Webinar Series











1st October 2021: IRIS Webinar on "Photonic Integrated Circuits"

IRIS Webinar on "Photonic Integrated Circuits" from IoE IIT Madras showcased the invaluable insight on Silicon Photonics research and fabrication facilities as well as state-of-the-art global R&D scenarios. Prof. Wim Bogaerts (Ghent University, Belgium), one of the pioneers in Silicon Photonics gave his valuable talk on this field along with Prof. Bijoy Krishna Das and Prof. Enakshi Bhattacharya. We are thankful to Prof. Shayan Mookherjea (University of California, San Diego, USA) for being the moderator of this webinar.


18th August 2021: Riddhi's PhD Defence

We are proud to announce that our research scholar Ms. Riddhi Nandi has successfully defended her PhD thesis entitled, "Electrical Control of Optical Bistability in Silicon Microring Resonators". She has already started her professional career in Global Foundries Bangalore (Silicon Photonics Group). Congratulations Dr. Riddhi Nandi.


30th December 2020: Fund Sanctioned for CoE-CPPICS

The Centre of Excellence CPPICS @ IIT Madras has been jointly sponsored by MeitY, Govt. of India and izmo Microsystems, Bengaluru (https://www.izmomicro.com). Total project value is Rs. 2990.80 Lakhs (~ 4.1 Million USD) and for a duration of five years starting from 1st January, 2021.


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