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Silicon photonics technology brings the volume CMOS manufacturing to optical communications in order to address clear values as speed, cost, and integration. However, the targeted data-rate levels for Telecom or Datacom applications require also high speed electronics to be closely connected to the photonics into the optical transceivers. This co-integration is key to scaling bandwidths at low costs...
Fast microscopic imaging has greatly potential applications in biology, medical science and environment monitoring. The ability to image specimen at high speed is particularly important for inspecting a large quantity in a short period of time. CCD or CMOS cameras are conventionally used for imaging, but has limited frame rate and data throughput. In this report, time-stretch high-speed microscopic...
We demonstrated a 2µm switchable, tunable and power-controllable dual-wavelength fiber laser by adjusting the center wavelengths of FBGs and the cavity losses, respectively. The topology is based on the parallel connection of FBGs using 3×3coupler.
Pure-silica-core fiber having enlarged Aeff of 130µm2 is confirmed to have low macro-, micro-bending losses and high figure-of-merit in both C- and L-bands, indicating applicability of this PSCF to broadband transmission system.
We propose a dual-polarization signal-carrier interleaved direct detection (DP-SCI-DD) scheme to achieve 100% spectrum efficiency with reference to single polarization coherent detection. The channel is modeled as a discrete time Gaussian channel with conjugate inter-symbol interference.
We review bandwidth constraining and digital signal processing techniques for achieving high spectral efficiency optical fiber transmissions. We discuss advantages and disadvantages of three different combinations of adaptive equalization and sequence detection schemes, and show experimental demonstrations.
we report theoretical and experimental investigations into a polarization maintain fiber (PMF) coupler with novel transmission characteristics. The experimental results show that for circular and elliptically polarized input light, the novel coupler will act as an in-line polarizer and as a conventional fused-taper PMF coupler, the output polarization extinction ratio (PER) of the transmission arm...
We developed fiber bundle type fan-out (FBF) for 19-core multicore fiber (MCF). Insertion loss < 1.15 dB was confirmed for FBF-MCF-FBF configuration. Loss variation < ±0.12 dB was confirmed from −10 to 60 degrees C.
Tunable multi-wavelength dissipative solitons (DSs) were experimentally demonstrated in an Yb-doped fiber laser based on semiconductor saturable absorption mirror (SESAM) and Lyot-Sagnac filter. Thanks to the tunability of the Lyot-Sagnac filter, mode locking of up-to-6-wavelength DSs was achieved.
An optical frequency-interleaving full-duplex technique for fiber-optic transmission of 96-GHz-band frequency-modulated continuous-wave downlink signal and 10-Gb/s on-off-keying uplink signal is newly proposed. The proposed full-duplexing technique with a flexible wavelength channel selector is experimentally demonstrated.
We discuss an on-chip multiple-channel electrical-optic-electrical links which are implemented on a large-scale silicon photonic integrated circuit. The optical circuits can also be configurable as an NxN non-blocking switch as well as a broadcasting network.
An all-fiber based tapered mode selective coupler (AFTMSC) is proposed and it can convert LP01 mode to higher-order modes (LP11, LP21 and LP02 mode) with coupling efficiency better than 70% in wavelength range of 1450nm to 1650nm.
We discuss recent progress on the use of optical and digital phase conjugation techniques for nonlinearity compensation in optical fiber links. We compare the achievable performance gain of phase conjugated twin wave applied in two polarization states and time segments with mid-link optical phase conjugation and digital back propagation. For multicarrier transmission scheme such as orthogonal frequency...
A highly stable multi-beam wavelength monitor is proposed. The measured variation in the monitored wavelength with an etalon angular shift of 0.18° is 1.34 GHz, whereas that for a conventional wavelength monitor is 6.54 GHz.
A long-haul transmission of 1.28Tb/s quad-subcarrier PM-16QAM based superchannel (5.0bit/s/Hz) employing EDFA only/ EDFA-Raman amplification schemes is reported. Maximum recorded reach is 3,000km/ 2,050km and 3,350km/2,250km without and with DBP for LAPSCF/ SSMF, respectively.
We review recent single-carrier 400G schemes based on high baud rate signals with different spectrum efficiency (SE) based on QPSK and 16QAM. The long-haul performances under different transmission conditions and modulation formats are studied. The digital signal processing for 400G signal recovery is also discussed.
We experimentally evaluate flex-grid network upgrade scenarios, employing variable data rates and modulation formats and show that optical channel power should be assigned with knowledge of existing neighboring traffic to achieve best performance in WDM transmission.
We experimentally demonstrate Nyquist superchannel transmission of 515Gb/s (8×64.4Gb/s) PDM-128QAM over single span of 120 km SSMF, using backward Raman amplification at the receiver-side. We achieve a record distance of unrepeatered transmission for the spectral efficiency (SE) as high as 10.31b/s/Hz.
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