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Broadband low dispersion is shown for both fundamental mode and orbital angular momentum mode in fiber structures with submicron slot. Octave supercontinuum generation covering one octave in the slot fiber for both fundamental mode and OAM mode is shown by simulation.
Amplification characteristics of MC-EDFA are reviewed. Applicability to future network is evaluated by utilizing core-pumping configuration. In addition, cladding-pumping configuration, which has possibilities for reducing power consumption and downsizing, is demonstrated.
New SBS suppressed phosphosilicate Raman gain fibers are demonstrated with longitudinally varying core doping concentrations. Peak Brillouin gain is reduced by 6 dB over standard fibers resulting in a 2.8 dB increase in amplified power.
We demonstrate a dual-band Tm3+:ZBLAN fiber laser emitting simultaneously at 810 nm and 1487 nm through two transitions originating from the 3H4 energy level. Upconversion pumping at 1064 nm is used.
An efficient all-fiber compact ∼ 50 cm long microstructured optical fiber-based 3–4.2 µm mid-IR light source with power conversion efficiency > 28% has been designed by exploiting FWM with Er3+-doped ZBLAN fiber as the pump.
Pure-silica-core fiber with ultra-low loss of 0.15dB/km and appropriately enlarged Aeff of 130µm2, representing the highest figure-of-merit for digital coherent systems, is presented for supporting high capacity long haul optical transmissions in very near future.
We investigate effects of macro- and micro-bending on multicore optical fibers including crosstalk, skew, and loss, as well as the performance of a transmission system.
We report dispersion tolerance enhancement using optical Duobinary detection for optimized 20–70 Gbit/s NRZ Transmission over up to 45-km as a low cost way of dispersion tolerance enhancement in high rate transmission systems. We show that maximum reach increases compared to standard NRZ transmission/detection respectively.
We demonstrate optical demultiplexing of a QPSK signal into two BPSK sub-channels based on coherent vector addition of original signal and the phase conjugated copy respectively. Both sub-channels of a QPSK signal are extracted simultaneously and independently using a scalable phase sensitive amplification technique. This phase sensitive method potentially may also be applied to higher level QAM signals.
A biologically-inspired mathematical transform for compressing the bandwidth of analog signals is introduced. One of its applications is frequency-selective sampling to minimize the required record length for a given digitizer sampling rate.
A hybrid orthogonal frequency-division multiplexing pulse-position modulation (OFDM-PPM) technique is proposed. A closed form expression for the BER of free space optical systems adopting the proposed technique under gamma-gamma channel model is derived.
Improvement in bit error rate performance of asymmetrically-clipped optical orthogonal frequency-division multiplexing (ACO-OFDM) is achieved through proposed modification by using unipolar encoding. This modification eliminates the 3 dB difference between ACO-OFDM performance and bipolar OFDM.
We propose to insert inverse group velocity dispersion in a conventional time-lens based optical pulse generator to generate pedestal-free optical pulses without optical filtering. A 10-GHz 6.14-ps pedestal-free pulse train is achieved experimentally.
A new method for complete optical signal characterization is presented and numerically demonstrated. This technique exploits the properties of minimum-phase filters to provide a general, linear and non-interferometric (self-referenced) characterization platform capable to perform real-time direct temporal phase-profile reconstruction without any phase measurement.
Space-division multiplexing with multi-core fiber is an attractive technology to increase a system capacity drastically. In this paper, the feasibility of trans-oceanic transmission using multi-core fibers is discussed.
The MODE-GAP project was established to identify the optimum fiber type for use beyond the capacity crunch. This paper will review some of the key drivers behind the project and analyze the key limits and potential improvements‥
We present a compact multi-ring fiber transmitting multiple orbital angular momentum (OAM) modes. The designed multi-ring multi-OAM-mode fiber (MRMOF) consists of 7 rings each supporting 22 OAM modes, i.e. 154 channels in total.
A compact 19-core fan-in/fan-out waveguide device for uncoupled multi-core fibers was demonstrated using laminated polymer waveguide. The coupling losses from a 19-core fiber to nineteen single-core fibers were less than 2.0 dB and the sum of crosstalk from all neighboring cores were lower than −40 dB.
We develop the 100Gbit/s compact receiver module with the built-in optical de-multiplexer in the 6.7 mm-width package. The minimum receiver sensitivity of the receiver module at 28Gbit/s is successfully achieved up to −12 dBm in the case temperature range from −10 °C to 80 °C.
The 100Gbit/s compact transmitter module for CFP4 is presented for the first time, where the optical multiplexer, quad-channel LD driver, and four laser diodes are all integrated in the small package. The very clear eye openings at 25Gbit/s are confirmed with very low power consumption up to 1.2W in the case temperature range from −10 to 75 degC.
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