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4953 Vine Street San Diego, CA 92465


Mon – Sat 8:00 – 18:00
Sun – Closed

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About Coset

We are an industry-leading, alternative 400GBE plus transceiver-ready, optical parts manufacturer…


Our expert packaging process is the key to the reliability and functionality of semiconductor diode chips and without Coset’s..


Our state of the art manufacturing facilities, headquartered in Gwangju, South Korea, boasts facilities to meet any needs…


We are THE CHOICE of optical system manufacturers and optical network providers for 400GBE ready transceivers, TOSA/ROSA and optical transmission parts manufacturing.

Technology Driven

One of Coset’s core values since its inception is to be at the forefront of new technology and manufacturing cutting edge products, like pump lasers, leaving us far ahead of the competition.

Extensive Experience

Coset has over 20 years of experience in our field and every aspect of our operation puts that to use from the first time we might a client to the timely delivery of any of our high quality products.

Cost Effective Solution

Thanks to the efficiency and automation of our facilities, Coset has been able to pass the savings on to our clients to provide competitive products in the marketplace.

Excellent Customer Service

We realize our partnership with our customers is paramount to our continued success and our sales and customer care teams are always client-first driven.

Our Clients

We have partnerships and manufacture for multiple industry leaders including 3SP Technologies, O Net Technologies, Fujitsu, ThorLabs and Lumics just to name a few.

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