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Abhay M. Joshi & Shubhashish Datta
Discovery Semiconductors, Inc.
119 Silvia Street
Ewing, New Jersey, 08628 USA
Tel: 609-434-1311, Fax: 609-434-1317
ABSTRACT
A 3R photoreceiver with automatic gain control and clock & data recovery, which operates from 1.2um to 2.2um wavelength for multiple modulation formats and data rates up to 28.3Gb/s. This solution will significantly improve flexibility of ad-hoc FSO networks in the next-generation avionics-platforms.
INTRODUCTION
Photonic systems are being increasingly designed for multi-functional, distributed avionic platforms to satisfy the next-generation military needs [1]. This approach requires establishing high-capacity, Free-Space Optical (FSO) communication networks that connect a variety of mobile and aerial platforms in an ad-hoc fashion [2]. Traditional design methodology, that addresses a specific scenario with state-of-the-art performance, needs to be significantly upgraded to increase scalability and flexibility. For example, although traditional FSO designs have leveraged ubiquitous 1550 nm telecommunication technologies, recent advances in 2 micron wavelength fiber amplifiers and lasers enable links having inherently better eye safety and atmospheric propagation characteristics [3]. Such 2 micron links cannot be realized with conventional InGaAs high-speed photodetectors.
We present a flexible, balanced extended InGaAs photoreceiver that operates from 1.2 μm to 2.2 μm wavelength range, and can be optimized for multiple data rates and optical modulation formats, including Amplitude Shift Keying (ASK) and Differential Phase Shift Keying (DPSK). The photoreceiver's Automatic Gain Control (AGC) functionality enables a dynamic range of 20 dB, and is particularly useful in combating atmospheric fades. We also present a full "3R" (Receive, Reshape, and Retime) solution by incorporating Clock and Data Recovery (CDR) units that operate at multiple data rates up to 28.3 Gb/s.REFERENCES
- [1] P. Matthews, "The Role of Photonics in Next Generation Military Systems," IEEE AVFOP Conf. 2016, invited paper TuA3.1, Long Beach, CA, 31 Oct – 3 Nov, 2016.
- [2] R. Ridgway, "DARPA Programs in High-Capacity Communications," IEEE AVFOP Conf. 2014, invited paper TuA1, Atlanta, GA, 11 - 13 Nov, 2014.
- [3] G. Wilkins, "Eye-Safe 2-Micron Laser Communications System," report WL-TR-96-1017 submitted to Wright Patterson Air Force Base, OH, Jan 1996.
*Presented at AVFOP 2017,New Orleans,Louisiana
Related links: 2.2 Micron extended InGaAs photodiodes and photoreceivers (2017)
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