Photonics Research, Volume. 7, Issue 8, 917(2019)
Mode demultiplexing hybrids for mode-division multiplexing coherent receivers
Figures & Tables(11)
Fig. 1. Illustration of input-to-output mapping for MPLC-based devices. (a) Mode multiplexer converting two separated input beams into two overlapped orthogonal beams; (b) interferometrically combining two separated input beams; (c) optical 90-deg hybrid mixing of two separated input beams; (d) mode demultiplexer and optical 90-deg hybrid separating and converting orthogonal overlapped modes and mixing with their respective local oscillators. The phase retardations of the spots are marked alongside them.
Fig. 2. Phase patterns of the designed phase plates and simulated beam intensity profiles right after each phase plate.
Fig. 3. Amplitude and phase retardation of output beam slice along the mirror symmetric line for the (a)
Fig. 4. Cross-correlation matrix of the normalized output field to ideal output field for different inputs. The four diagonal elements are the correlations of the
Fig. 5. (a) Photocurrent with balanced detection as a function of the phase shift of the input mode; in-phase versus quadrature components of the photocurrents (b) before and (c) after DC offset removal and amplitude rescaling.
Fig. 6. Performance of a three-mode MDH as a function of the number of phase plates. (a) Insertion loss and mode-dependent loss, (b) phase deviation, and (c) intra-port power uniformity.
Fig. 7. (a) The IL and MDL, (b) power coupling efficiency, (c) the maximum intra-port power uniformity, and (d) the maximum absolute phase error as a function of the operating wavelength ranging from 1.5 to 1.6 μm, respectively.
Fig. 8. MDH performance at phase retardation resolution of the phase plates from 2 to 8 bits. (a) The IL and MDL, (b) power coupling efficiency, (c) the maximum intra-port power uniformity, and (d) the maximum absolute phase error.
Fig. 9. MDH performance at different pixel sizes. (a) The IL and MDL, (b) power coupling efficiency, (c) the maximum intra-port power uniformity, and (d) the maximum absolute phase error.
Table 1. Amplitude, Offset of Balance Detected Photocurrent, and Phase Error between the In-Phase and Quadrature Components
View tableView in ArticleTable 1. Amplitude, Offset of Balance Detected Photocurrent, and Phase Error between the In-Phase and Quadrature Components
Mode Amplitude of In-Phase Amplitude of Quadrature Offset of In-Phase Offset of Quadrature Phase Error 0.75 0.84 −0.75 −0.50 −5.86 1.24 1.20 −0.37 −0.34 4.56 1.92 1.71 5.06 3.27 −2.21
Table 2. Performance Metrics of Mode Demultiplexer and Optical 90-deg Hybrid
View tableView in ArticleTable 2. Performance Metrics of Mode Demultiplexer and Optical 90-deg Hybrid
Mode LO Products IL (dB) −1.17 −1.02 −1.22 −0.76 Xtalk (dB) −14.74 −13.95 −15.89 −13.03 — (dB) 0.75 0.74 1.33 2.62 (deg) 1.31 −0.03 0.49 2.89 5 (dB) 0.50 0.15 0.49 — (deg) −5.86 4.56 −2.21 — —
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He Wen, Huiyuan Liu, Yuanhang Zhang, Peng Zhang, Guifang Li, "Mode demultiplexing hybrids for mode-division multiplexing coherent receivers," Photonics Res. 7, 917 (2019)
Paper Information
Category: Fiber Optics and Optical Communications
Received: Feb. 25, 2019
Accepted: Jun. 7, 2019
Published Online: Jul. 26, 2019
The Author Email: He Wen (he.wen@creol.ucf.edu)
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