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Proceedings Paper

Single-polarization optical low-noise pre-amplified receiver for heavily coded optical communications links
Author(s): Jeffrey M. Roth; Amrita Masurkar; Vincent Scalesse; Jeffrey R. Minch; Frederick G. Walther; Shelby J. Savage; Todd G. Ulmer
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Paper Abstract

We report a single-polarization, optical low-noise pre-amplfier (SP-OLNA) that enhances the receiver sensitivity of heavily-coded 1.55-μm optical communication links. At channel bit-error ratios of approximately 10%, the erbium-doped SP-OLNA provides an approximately 1.0-dB receiver sensitivity enhancement over a conventional two-polarization pre-amplfier.

The SP-OLNA includes three gain stages, each followed by narrow-band athermal fiber Bragg gratings. This cascaded fiter is matched to a return-to-zero, 2.88-Gb/s, variable burst-mode, differential phase shift keying (DPSK) waveform. The SP-OLNA enhancement of approximately 1.0 dB is demonstrated over a range of data rates, from the full 2.88-Gb/s (non-burst) data rate, down to a 1/40th burst rate (72 Mb/s).

The SP-OLNA'sfirst stage of ampli_cation is a single-polarization gain block constructed from polarization-maintaining (PM) fiber components, PM erbium gain fiber, and a PM integrated pump coupler and polarizer. This first stage sets the SP-OLNA's noise figure, measured at 3.4 dB. Two subsequent non-PM gain stages allow the SP-OLNA to provide an overall gain of 78 dB to drive a DPSK demodulator receiver. This receiver is comprised of a delay-line interferometer and balanced photo-receiver. The SP-OLNA is packaged into a compact, 5"x7"x1.6" volume, which includes an electronic digital interface to control and monitor pump lasers, optical switches, and power monitors.

Paper Details

Date Published: 16 March 2015
PDF: 9 pages
Proc. SPIE 9354, Free-Space Laser Communication and Atmospheric Propagation XXVII, 935409 (16 March 2015); doi: 10.1117/12.2084844
Show Author Affiliations
Jeffrey M. Roth, MIT Lincoln Lab. (United States)
Amrita Masurkar, MIT Lincoln Lab. (United States)
Columbia Univ. (United States)
Vincent Scalesse, MIT Lincoln Lab. (United States)
Jeffrey R. Minch, MIT Lincoln Lab. (United States)
Frederick G. Walther, MIT Lincoln Lab. (United States)
Shelby J. Savage, MIT Lincoln Lab. (United States)
Todd G. Ulmer, MIT Lincoln Lab. (United States)

Published in SPIE Proceedings Vol. 9354:
Free-Space Laser Communication and Atmospheric Propagation XXVII
Hamid Hemmati; Don M. Boroson, Editor(s)

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