Tellabs, Inc. is headquartered in Naperville, Illinois, a city situated in the Chicago metropolitan area. The company has established a significant presence in the telecommunications industry with its focus on developing innovative solutions for network operators and service providers. In addition to its main office in Naperville, Tellabs may have other locations or partners in various regions to support its global operations. For detailed information regarding their locations or any inquiries you may have, it is advisable to visit their official website. This will provide you with the most current details and contact information if needed.