Experimental verification of coherent tracking system based on fiber nutation

Zhao, Xueqiang; Hou, Xun; Zhu, Funan; Sun, Jianfeng; Zhu, Rihong; Gao, Min; Yan, Yang; Chen, Weibiao

doi:10.1364/oe.27.023996

Cited by 11 publications

(9 citation statements)

References 10 publications

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“…5 For fiberless receivers based on direct detection, recent research has focused on custom-engineered hybrid avalanche photodiode (APD) arrays which can simultaneously act as a high-bandwidth data receiver and as a position sensing device. 6 For fiber-coupled receivers (both coherent and direct detection), the fiber nutation technique, a method based on extremum-seeking control, has been used to successfully demonstrate beaconless tracking both in laboratory [7][8][9][10] and on orbit. 11 Fiber nutation enables inference of pointing information by superimposing a small pointing dither onto the received optical field, either using piezoelectric actuators, 9,11 an electro-optic nutation device, 8 or more recently, using MEMS FSMs.…”

Section: Introductionmentioning

confidence: 99%

“…6 For fiber-coupled receivers (both coherent and direct detection), the fiber nutation technique, a method based on extremum-seeking control, has been used to successfully demonstrate beaconless tracking both in laboratory [7][8][9][10] and on orbit. 11 Fiber nutation enables inference of pointing information by superimposing a small pointing dither onto the received optical field, either using piezoelectric actuators, 9,11 an electro-optic nutation device, 8 or more recently, using MEMS FSMs. 10 Variations in fiber-coupled power at the nutation frequency are then used to derive the position of the received beam relative to the fiber core axis.…”

Section: Introductionmentioning

confidence: 99%

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Beaconless pointing and tracking for bidirectional optical links using MEMS mirror nutation

Čierny¹,

Serra

Cahoy

2021

Free-Space Laser Communications XXXIII

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Free-space laser links traditionally utilize an independent spatial tracking channel with a beacon laser and tracking sensors to meet stringent pointing requirements. In this work, we propose a miniaturized monostatic beaconless fiber transceiver that infers fine tracking information using existing receiver optoelectronics and a small injected pointing dither (nutation). A single MEMS steering mirror is used to both fine-point the beams and inject nutation. While this results in some additional link loss due to disturbed fiber coupling and transmit beam pointing, our analysis shows the loss becomes negligible for sufficient SNR. Links without point-ahead correction need an SNR of about 35 dB to minimize the dither loss below 0.1 dB and also maintain the RMS spatial tracking noise below a tenth of the beam divergence. Since the pointing and tracking bandwidth is typically many orders of magnitude slower than the receiver communication bandwidth, such SNR is usually achievable on the receiver with appropriate filtering. If point-ahead correction is needed, we show that depending on the available link margin, a transceiver based on single-mode fiber can reach up to about 1 beamwidth of correction, while a few-mode fiber design can reach up to about 1.75 beamwidths due to improved coupling sensitivity at higher point-ahead offsets. Finally, we propose the use of double-clad fiber with a secondary detector to help further minimize the incurred coupling loss.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Beaconless pointing and tracking for bidirectional optical links using MEMS mirror nutation

Čierny¹,

Serra

Cahoy

2021

Free-Space Laser Communications XXXIII

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“…In the same year, we proposed an engineering scheme of fiber nutation tracking technology. The system uses an erbium-doped fiber amplifier (EDFA) to amplify the signal light, reducing the sensitivity of the signal demodulation module to the insertion loss and the requirement of gain bandwidth product of the photo-detector [9] .…”

mentioning

confidence: 99%

“…At present, there are two methods for calculating the boresight error: the "stochastic parallel gradient descent (SPGD) algorithm" and the "four-point scanning algorithm" [5,6,9,10] . The SPGD algorithm relies on multiple iterations, which makes it difficult to improve the control bandwidth.…”

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confidence: 99%

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Analysis of detection error for spot position in fiber nutation model

et al. 2020

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The influences of nutation trail accuracy, simplification of coupling model, spot position jitter, and power variation of incident light on the detection error are analyzed theoretically. Under the condition of satisfying the requirements, the nutation radius is less than 1.13 μm, the accuracy of the nutation trail is less than 0.04 μm, and the detection range is [−5 μm, +5 μm]. The nutation frequency is 160 times spot position jitter frequency and 100 times intensity jitter frequency of incident light. The analysis is of great significance for determining nutation radius and frequency in the tracking system based on fiber nutation.

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