Jeffery Scott Stone

SDM transmission of real-time 10GbE traffic using commercial SFP + transceivers over 0.5km elliptical-core few-mode fiber

We experimentally demonstrate the first few-mode space division multiplexed (SDM) transmission of real-time 10Gb/s Ethernet (10GbE) traffic using commercial small form-factor pluggable SFP + transceivers without coherent detection or multiple input multiple output digital signal processing (MIMO-DSP) over 0.5km elliptical-core few-mode-fiber, achieving <-26dB crosstalk between LP(11e) and LP(11o) modes at 1.3μm.

Design of universal fiber with demonstration of full system reaches over 100G SR4, 40G sWDM, and 100G CWDM4 transceivers

Universal fiber has an LP01 mode field diameter approximately matched to that of standard single mode fiber, while being a multimode fiber. We analyzed the dependence of the mode field diameter on the core diameter for different core delta values. Guided by the analysis, a universal fiber having a delta of 1.2% was fabricated, showing significantly reduced coupling loss of ~2.3 dB with conventional multimode fiber. We demonstrated that the fiber can transmit with full system reach in both single mode and VCSEL-based multimode transmissions, including 100G SR4, 40G sWDM, and 100G CWDM4 for the first time.

Spatial mode analysis of an elliptical-core, few-mode, optical fiber for MIMO-less space-division-multiplexing

We measure the mode coupling matrix for a 0.5km elliptical-core few-mode fiber supporting six spatial modes (HG₀₀, HG₀₁, HG₁₀, HG₀₂, HG₂₀, and HG₁₁) at 980nm. We demonstrate low crosstalk <;-16dB between any pairs of modes even under severe bending. EC-FMFs are suitable for short-reach MIMO-less transmission.

Dual Core Optical Fiber for Distributed Brillouin Fiber Sensors

A dual core optical fiber is designed and fabricated for simultaneous measurements of strain and temperature in distributed Brillouin sensors. Brillouin frequency shift difference of 120 MHz between the two cores is demonstrated.

Bend-insensitive optical fiber with high-mechanical reliability for silicon photonic packaging

In this paper, we propose bend insensitive fiber designs that can meet both the bend loss and mechanical reliability needs for silicon photonic packaging. To improve the bend loss, we adopt profile designs with a low index trench that allow us to reduce the bending loss while keeping the mode field diameter compatible with the standard single mode fiber. To improve the mechanical reliability, we put a Titania-doped glass layer on the surface of the fiber cladding, which improves the fiber reliability under tight bending conditions. We describe both the core and Titania layer designs and present results on fiber optical and mechanical performances.

Novel optical fibers for distributed sensor applications

We present novel optical fiber designs to improve performance of distributed optical fiber sensors based on Rayleigh and Brillouin scatterings, including hybrid core fiber for increasing Rayleigh backscattered signal, dual core fiber for simultaneous measurement of temperature and stain, few mode fiber for enhancing sensitivity and spatial resolution and Brillouin frequency managed fiber for increasing sensing range.

Universal fibers for data center applications

In this paper, we present a new type of optical fiber, called universal fiber, which can be used for both multimode and single mode transmissions. The fiber is a multimode fiber that has an LP01 mode field diameter approximately matched to that of standard single mode fiber. First, we will present the universal fiber design concept and discuss design tradeoffs for both single mode and multimode operations. Then we will show characterizations of a preliminary experimental fiber and present system testing results with 110 m, 150 m and 2700 m system reach using 100G SR4, 40G sWDM multimode and 100G CWDM4 single mode transceivers, respectively, which demonstrate both multimode and single mode transmission capabilities of universal fiber.

Real-time Bi-directional 10GbE transmission using MIMO-less space-division-multiplexing with spatial modes

Bi-directional transmission using MIMO-less space-division-multiplexing with spatial modes is experimentally demonstrated. 10GbE real-time data-streams are bi-directionally transmitted error-free (<;-22.0dB mode crosstalk) using LP01↔LP11° and LP11°↔LP11e modes over a 0.5km, elliptical-core, few-mode optical fiber full-duplex.

MIMO equalization analysis for SDM transmission over 2km elliptical-core few-mode fiber for datacenter applications

As intra-datacenter networks (DCN) continue to experience exponential traffic growth, techno-economic reasons, such as cabling footprint reduction, are driving increases in the number of data channels per optical fiber. Optical space division multiplexing (SDM), wherein independent data channels are carried over a single fiber through a multiplicity of spatial modes are thus gaining prominence for intra-DCN transmission. In this paper, we present a time and frequency domain MIMO equalization analysis for experimental space division multiplexed (SDM) transmission of LP01 and LP11e modes over 2km of elliptical core few-mode fiber (EC-FMF). For 19Gbaud dual polarization quadrature phase shift keying (DP-QPSK) transmission with coherent detection, we observe polarization mode dispersion (PMD) durations of about 12 and 15 taps at half-baud-rate equalizer tap spacing for LP01 and LP11e modes, respectively. Since modal crosstalk between LP01 and LP11e modes is very low, 2×2 MIMO processing is sufficient for dual-polarization and dual-mode SDM transmission over the EC-FMF. By efficiently enabling channel density gains, the EC-FMF SDM approach can be attractive for next-generation intra-DCN.