Testing of a compact 10-Gbps Lasercomm system at Trident Warrior 2017

Juarez, Juan C.; Souza, Katherine T.; Nicholes, Dustin D.; O'Toole, Michelle P.; Patel, Krunal; Perrino, Kathleen M.; Riggins, James L.; Tomey, Hala J.; Venkat, Radha A.

doi:10.1117/12.2290143

Cited by 3 publications

(2 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The center fiber is used for bidirectional 10 Gbit/s optical data transmission and reception facilitated by an external fiber communications modem, while the surrounding fibers are used for fine pointing and tracking and are routed to optical detectors on an electronics board mounted inside the terminal. In previous work [5], a quadrant detector was used to achieve receiver spatial acquisition, but the separate beam paths resulted in positioning offsets that needed to be manually compensated through temperature fluctuations. The fiber bundle-based architecture allows for co-boresighted data reception and tracking, resulting in a simplified and robust pointing apparatus.…”

Section: System Architecturementioning

confidence: 99%

Fiber bundle-based beam tracking demonstrated across 30 km terrestrial FSO communications link

O'Toole,

Voshell,

Patel

et al. 2024

Free-Space Laser Communications XXXVI

Self Cite

View full text Add to dashboard Cite

Free space optical (FSO) communications systems require robust pointing, acquisition, and tracking approaches to close and maintain links due to inherent beam directionality and susceptibility to atmospheric effects. Typically, the incoming beam must be split into two paths to align with two spatially separated detectors, one for beam position sensing and the other for data reception. We present a dual-purpose, in-line position sensor and data receiver using a 7-fiber hexagonallypacked fiber bundle. We present data collected across a 30 km terrestrial FSO link op erating at 10 Gbit/s line rate with an average 95% link availability, and compare these results to outputs from our link budget model.

show abstract

Section: System Architecturementioning

confidence: 99%

Fiber bundle-based beam tracking demonstrated across 30 km terrestrial FSO communications link

O'Toole,

Voshell,

Patel

et al. 2024

Free-Space Laser Communications XXXVI

Self Cite

View full text Add to dashboard Cite

show abstract

“…Some of these systems use an optical beam splitting method in which one path receives data via a fiber receiver module and the other path provides beam tracking using a set of four colocated optical sensors referred to as a quadrant detector. 6 However, this method can result in added insertion loss and present alignment challenges. In this article, we will present a rethinking of this tracking approach that uses seven co-boresighted fibers in a fiber bundle design in which the outer six fibers serve as tracking sensors and the central fiber serves as a data beam receiver.…”

Section: Introductionmentioning

confidence: 99%

Fiber bundle-based beam tracking approach for free space optical communications link optimization

Patel,

O’Toole,

Newell

et al. 2024

Opt. Eng.

View full text Add to dashboard Cite

A robust pointing, acquisition, and tracking approach is critical to closing and maintaining a free space optical communications link. Many fiber-coupled terminal architectures use a beamsplitter to direct a portion of the received light onto a quadrant detector and generate an error signal. A feedback control loop uses this error signal to adjust a fine steering element to maximize power into the collection fiber. However, this approach produces additional insertion loss due to transmission through a beamsplitter and tracking loss due to inevitable boresighting errors between the quadrant detector and the collection fiber. We present an alternative architecture that makes use of a hexagonally packed, seven-fiber bundle for data beam tracking. The outer fibers are inherently co-boresighted position sensors used to sense displacement of the received beam from the central data fiber. We present field test data directly comparing performance between a fiber bundle-based terminal and a quadrant detector-based terminal. Our results show nearly an order of magnitude of improvement in control loop tracking stability and a 2.8× improvement in tracking performance as seen in Strehl ratio for the fiber bundle system.

show abstract

Multi-Gb/s free-space laser communication at 4.6-μm wavelength using a high-speed, room-temperature, resonant-cavity infrared detector (RCID) and a quantum-cascade laser

Marsland,

Jacobs,

Canedy

et al. 2024

Opt. Express

View full text Add to dashboard Cite

Research has shown that free-space laser communication systems may experience fewer outages due to atmospheric impairments such as haze, fog, clouds, and turbulence by operating at a longer wavelength in the mid-wave or long-wave infrared, if disadvantages such as lower-performance transceiver components may be overcome. Here we report a resonant cavity infrared detector (RCID) with 4.6-µm resonance wavelength that enables 20-dB larger link budget than has been reported previously for ∼ 5 Gb/s operation. The device combines high responsivity, 1.97 A/W, with a low noise equivalent power (NEP) of 0.7 pW/Hz at room temperature, and a high bandwidth of 6.7 GHz at 3-dB. The relatively large surface-normal-incidence device with 30-µm diameter simplifies the coupling relative to intra-subband quantum cascade detectors. Although the RCID NEP is expected to increase with frequency to ∼ 1.5 pW/Hz, we estimate that the total equivalent noise power in a 2.5-GHz bandwidth is less than 200 nW. When combined with a relatively high power (∼100-mW) distributed-feedback quantum cascade laser, the difference of > 50 dB between modulated laser power and RCID noise significantly outpaces that of existing devices.

show abstract

Testing of a compact 10-Gbps Lasercomm system at Trident Warrior 2017

Cited by 3 publications

References 4 publications

Fiber bundle-based beam tracking demonstrated across 30 km terrestrial FSO communications link

Fiber bundle-based beam tracking demonstrated across 30 km terrestrial FSO communications link

Fiber bundle-based beam tracking approach for free space optical communications link optimization

Multi-Gb/s free-space laser communication at 4.6-μm wavelength using a high-speed, room-temperature, resonant-cavity infrared detector (RCID) and a quantum-cascade laser

Contact Info

Product

Resources

About