CALIENT Technologies

Move the light, not the fiber

Leadership Team

Arjun Gupta
Executive Chairman and Acting CEO

Arjun Gupta is the Executive Chairman at CALIENT and has been the key investor in CALIENT for two decades. In addition, Arjun is the Chief Believer and founder of Telesoft Partners (, a special situations venture capital firm in Silicon Valley. Over the last twenty‑five years, he has invested in and helped build over 85 technology companies, of which over 50 companies have been acquired or gone public (combined market cap over $750 billion). Recognizable brands include DocuSign,, T-Mobile USA, Uber and others. He was on the Forbes Midas List of Top-100 Venture Investors in 2006, 2007, 2008, 2009. Prior to Telesoft, Arjun was at McKinsey & Company where his clients included Apple, AT&T/PacBell, Verizon/PacTel and others. He was part of the Digital Transition Project for LA which launched Qualcomm CMDA against the industry standard of TDMA. He was also part of the Paradigm Project which led to the spinoff of General Magic from Apple. He started his career at Tektronix Inc, initially as an operating systems software engineer, then a field applications engineer and finally a product specialist covering new product introductions in the US, Germany and Japan. Arjun loves developing and scaling great technology products.

In 2001, Arjun launched a family foundation to support education, conservation and the performing arts. The foundation has supported over 100 projects in America, India and Africa. Arjun is a Trustee of Aspen Institute and the Aspen Music Festival. He is a co-founder and co-chair of YPO Gold Aspen. Arjun is an avid outdoorsman and has skied to the North Pole and to the South Pole and was recently appointed a UN Mountain Partnership Ambassador to help with climate change initiatives. Since 2013, Arjun has been a member of the new ownership group of the Sacramento Kings NBA basketball team.

Arjun received his MBA from Stanford University, an MS and BS (Phi Beta Kappa) in computer science from WSU, and a BA (Honors) in economics from St Stephen’s College (India). He is an ALI Fellow at Harvard University and a Henry Crown Fellow at the Aspen Institute. Arjun lives in San Francisco and Aspen.

Dr. Kevin Welsh
Co-President and SVP Operations

Dr. Kevin Welsh has responsibility for CALIENT world-wide manufacturing activities, including manufacturing, product delivery, and quality and reliability.  Kevin has over 20 years experience as a manufacturing and operations executive with demonstrated leadership and communication skills.   His broad operations management experience includes MEMS and wafer processing techniques, new product introductions, and manufacturing and test engineering.  Kevin has a proven track record in recruiting and retaining highly successful and enthusiastic teams that are focused on results and execution. Kevin began his career at IBM’s Advanced Technology Center in East Fishkill, New York where he developed new materials and processes for semiconductor photolithography. After IBM he worked for Seagate and, later, Applied Magnetics where he developed processes for the fabrication of magnetoresistive and giant magnetoresistive recording heads. Kevin has a Ph.D. in Chemistry from the University of Wisconsin and served as a postdoctoral research scientist at Columbia University.

Carvin Chen
Co-President and GM CALIENT China

Carvin is responsible for all CALIENT sales within China.  Prior to CALIENT, Carvin was the Deputy GM/Executive VP at Suzhou Chunxing Precision Mechanical Co., Ltd.  Chunxing is a leading company principally engaged in the manufacturing of precision aluminum and magnesium alloy structures as well as 3D glass, plastic structures for telecommunication, consumer electronics/IT, automobile and industrial market segments.  Its products mainly include precision die casting products, machining products, 3D glass products, stamping sheet metal parts and plastic injection parts. Chunxing is also engaged in the business of designing, manufacturing and distributing RF conditioning products for wireless telecommunication infrastructure.  Carvin was responsible for the overall operations of the company with multiple sites and 8000+ employees globally. He previously served as the Director of Operations at Andrew Telecommunications.

Dr. Shifu Yuan
CTO Optics

Dr. Yuan is responsible for research and development of CALIENT’s optical subsystems and components.  He has 30 years of R&D experiences in optics and photonics and over 15 years of technical management experience. He worked in Tsinghua University as a post‑doctoral researcher and an Associate Professor and has held a senior research scientist position in CREOL/School of Optics, University of Central Florida. Shifu’s industry experience includes Electro‑Optic Engineer at Chorum Technologies, Inc., Sr. Research Scientist at Corning, Inc., and CTO Optics at CALIENT. Dr. Yuan has made significant contributions to the field of optical communications through pioneering the development and commercialization of wavelength selective switch and large‑scale MEMS optical switching.  He has over 60 publications, holds more than 12 patents, and co‑authored a chapter for the book, Fibre Optic Communication: Key Devices (2012).  Dr. Yuan has a B.S. in Applied Physics, M.S., and Ph.D. in Optics from Harbin Institute of Technology, China.

Dr. Chris SB Lee

Dr. Lee is responsible for productizing and developing CALIENT’s MEMS switching solutions.  He joined CALIENT in 1999 after completing his doctoral research on the design and testing of Low-voltage, Single Crystal Silicon Micro‑Electro‑Mechanical Systems at Cornell University.  Dr. Lee leads the development efforts for CALIENT’s core MEMS technology and also oversees the production of MEMS modules.  Chris received his B.S. degree in Materials Science and Engineering from Massachusetts Institute of Technology and his Ph.D. in Electrical Engineering from Cornell University.  His extensive MEMS research was conducted at the Cornell NanoScale Science & Technology facility.  Dr. Lee’s prior work experience includes 2 years at Intel Corporation as a process and integration engineer in the Technology and Manufacturing Group.

Dr. Roger Hajjar
Senior Advisor, Products & Engineering

Since 2005, Dr. Hajjar has pioneered Laser Phosphor Display (LPD) technology, working with businesspeople and technologists in a variety of disciplines — both in the U.S. and around the globe. Dr. Hajjar has registered more than 100 U.S. and worldwide patents and has a long history of success in taking optical-based technologies from inception to high-volume manufacturing.

Prior to Prysm, Dr. Hajjar served as Vice President/GM of Transmission Subsystems with Avanex Corporation and Vice President of Technology with Vitesse Semiconductor. Dr. Hajjar was Chief Technology Officer and founder of Versatile Optical Networks prior to its acquisition by Vitesse, and later, by Avanex. Dr. Hajjar held management positions with TeraStor Corporation and the Eastman Kodak Company. He also held research positions at the Optical Sciences Center at the University of Arizona and IBM’s T.J. Watson Research Center.

He was recently honored with the prestigious 2016 Adele De Berri Pioneers of AV Award.

Dr. Hajjar holds a PhD and MS in Optical Sciences from the University of Arizona, as well as a BS in Electrical Engineering from Boston University, from where he graduated Summa Cum Laude.