Awaji, Yoshinari

Klaus, Werner

Mendinueta, José Manuel Delgado

Rommel, Simon

Sakaguchi, Jun

Tafur Monroy, Idelfonso

Vegas Olmos, Juan José

Wada, Naoya

Space division multiplexing (SDM) using fibers with multiple cores and/or supporting multiple modes has become an essential technology to support Pbit/s transmissions in a single fiber [1,2]. Despite significant mode-mixing in few-mode fibers (FMF), the original signals can be recovered through multiple-input multiple-output (MIMO) equalization, provided mode-dependent loss (MDL) is small [3]. Furthermore, modescrambling at the transmitter improves tolerance to MDL and maximizes system capacity if all supported modes are used to transmit information [3]. Thus, the MDL and mode mixing properties of spatial multiplexers (SMUXs) are important. In this work, we characterize the impulse response of a 36-core three-mode photonic lantern SMUX, similar to [4], with no mode selectivity, coupled to 2.9m 36-core three-mode fiber including a splice, using a spatially diverse optical vector network analyzer (SDMOVNA). Each mode group was identified and significant mode-mixing was found at the splice. The SDM-OVNA setup is a swept-wavelength interferometer as shown in Fig. 1(a), using time multiplexing with fiber delays for separation of device responses from different paths and thus allowing full characterization of one photonic lantern in a single sweep [5]. The measurement of the 36 photonic lanterns yields a 6×6 time domain response for each core, as shown inFig. 1(b). Reduced 3×3 matrices as shown in Fig. 1(c) and (d) are obtained when summing over the four possible polarization paths between an input-output pair. Comparing these across the 36 cores of the fiber, two groups with different behavior are identified: i) three peaks are visible within the time response matrix entries as in Fig. 1(c), ii) two additional peaks located between the extreme and central peaks are visible as inFig. 1(d). The groups of cores are found to be in opposite halves of the fiber, as highlighted in Fig. 1(e), showing a camera image of the cleaved fiber facet. Analysis of their relative delays and comparison with the known fiber differential mode delay [2] allows identification of mode groups and mode-mixing paths, showing significant mode mixing to take place at the multicore few-mode fiber splice. Furthermore, insertionloss and MDL of the system are further analyzed

Online Research Database In Technology

                       General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.  • Users may download and print one copy of any publication from the public portal for the purpose of private study or research. • You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal   If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.     Downloaded from orbit.dtu.dk on: Dec 18, 2017Impulse Response of a 36-Core Few-Mode Photonic Lantern Hybrid Spatial-MultiplexerRommel, Simon; Mendinueta,  José Manuel Delgado; Klaus, Werner; Sakaguchi, Jun; Vegas Olmos,Juan José; Awaji, Yoshinari ; Tafur Monroy, Idelfonso ; Wada, NaoyaPublished in:Proceedings of 4th International Symposium on Extremely Advanced Transmission TechnologyPublication date:2017Document VersionPeer reviewed versionLink back to DTU OrbitCitation (APA):Rommel, S., Mendinueta, . J. M. D., Klaus, W., Sakaguchi, J., Vegas Olmos, J. J., Awaji, Y., ... Wada, N. (2017).Impulse Response of a 36-Core Few-Mode Photonic Lantern Hybrid Spatial-Multiplexer. In Proceedings of 4thInternational Symposium on Extremely Advanced Transmission Technology  Impulse Response of a 36-Core Few-Mode Photonic Lantern Hybrid Spatial-Multiplexer Simon Rommel1),2), José Manuel Delgado Mendinueta1), Werner Klaus1), Jun Sakaguchi1), Juan José Vegas Olmos2), Yoshinari Awaji1), Idelfonso Tafur Monroy2) and Naoya Wada1) 1) National Institute of Information and Communications Technology, Koganei, Tokyo 184–8795, Japan 2) Department of Photonics Engineering, Technical University of Denmark, 2800 Kgs. Lyngby, Denmark  Abstract: Space division multiplexing (SDM) using fibers with multiple cores and/or supporting multiple modes has become an essential technology to support Pbit/s trans-missions in a single fiber [1,2]. Despite significant mode-mixing in few-mode fibers (FMF), the original signals can be recovered through multiple-input multi-ple-output (MIMO) equalization, provided mode-de-pendent loss (MDL) is small [3]. Furthermore, mode scrambling at the transmitter improves tolerance to MDL and maximizes system capacity if all supported modes are used to transmit information [3]. Thus, the MDL and mode mixing properties of spatial multiplex-ers (SMUXs) are important. In this work, we characterize the impulse response of a 36-core three-mode photonic lantern SMUX, similar to [4], with no mode selectivity, coupled to 2.9m 36-core three-mode fiber including a splice, using a spa-tially diverse optical vector network analyzer (SDM-OVNA). Each mode group was identified and signifi-cant mode-mixing was found at the splice. The SDM-OVNA setup is a swept-wavelength inter-ferometer as shown in Fig. 1(a), using time multiplex-ing with fiber delays for separation of device responses from different paths and thus allowing full characteri-zation of one photonic lantern in a single sweep [5]. The measurement of the 36 photonic lanterns yields a 6×6 time domain response for each core, as shown in Fig. 1(b). Reduced 3×3 matrices as shown in Fig. 1(c) and (d) are obtained when summing over the four pos-sible polarization paths between an input-output pair. Comparing these across the 36 cores of the fiber, two groups with different behavior are identified: i) three peaks are visible within the time response matrix en-tries as in Fig. 1(c), ii) two additional peaks located be-tween the extreme and central peaks are visible as in Fig. 1(d). The groups of cores are found to be in oppo-site halves of the fiber, as highlighted in Fig. 1(e), showing a camera image of the cleaved fiber facet. Analysis of their relative delays and comparison with the known fiber differential mode delay [2] allows identification of mode groups and mode-mixing paths, showing significant mode mixing to take place at the multicore few-mode fiber splice. Furthermore, inser-tion loss and MDL of the system are further analyzed. References [1] W. Klaus et al., “Advanced space division multiplexing technologies for optical networks,” J. Opt. Commun. Netw., 9(4), C1–C11 (2017). [2] J. Sakaguchi et al., “Large spatial channel (36-core×3 mode) hetero-geneous few-mode multicore fiber,” J. Lightw. Technol., 34(1), 93–103 (2016). [3] P. J. Winzer and G. J. Foschini, “MIMO capacities and outage prob-abilities in spatially multiplexed optical transport systems,” Opt. Ex-press, 19(17), 16680–16696 (2011). [4] P. Mitchell et al., “57 Channel (19x3) Spatial Multiplexer Fabricated using Direct Laser Inscription,” Proc. OFC 2014, M3K.5 (2014). [5] N. K. Fontaine et al., “Characterization of space-division multiplex-ing systems using a swept-wavelength interferometer,” Proc. OFC 2013, OW1K.2 (2013). Figure 1. (a) Spatially-Diverse Optical Vector Network Analyzer Setup; (b)-(d) measured impulse responses: full 6×6 response of core 4, polarization combined 3×3 responses of cores 8 and 30; (e) camera image of cleaved fiber facet with core identifications andregions of different behavior highlighted. 

Impulse Response of a 36-Core Few-Mode Photonic Lantern Hybrid Spatial-Multiplexer

http://orbit.dtu.dk/ws/files/131962411/author_version_3_.pdf

Impulse Response of a 36-Core Few-Mode Photonic Lantern Hybrid Spatial-Multiplexer

Abstract

Similar works

Full text

Available Versions

Online Research Database In Technology