We have developed a semiconductor optical amplifier (SOA) based incoherent light source for a co-propagating distributed Raman amplifier. By utilizing the incoherent light source as a 1st-order pump of the Raman amplifier, we have experimentally verified the reduction of RIN transfer regardless of the presence of simultaneous amplification by 2nd-order coherent pumps. In addition, improved Q-factor has been demonstrated by 22.5 Gbaud polarization-division multiplexing 16 quadrature amplitude modulation (PDM-16QAM) transmission experiment over 2720 km in a re-circulating fiber loop. From subsequent experimental study, we have redesigned wavelength shifted 1st-order incoherent pump and measured at Raman gains in L-band wavelength.
In this paper, we report the low loss (<0.06dB single-mode, <0.2dB multi-mode) 90°-bent with 1mm-bending radius
optical fiber by using 12-fiber ribbon for optical interconnection systems in both the single-mode and multi-mode case.
There are a lot of 90° light deflection techniques based on several types of 45° mirrors.- Our 90° light deflection
technique is based on bending optical fiber itself. This technology is easy to be adopted for optical surface mount
assemblies that need light beam deflection between the vertical surface-emitting lasers or surface-receiving photodiodes
and optical paths parallel to an electric circuit board. We describe the target of our developing system, concepts,
difficulty of glass fiber bending by failure probability, a single-mode fiber design for small bending with low bending
losses, multi-mode 90°-bent structure using polymer materials and the 80μm-cladding 125μm spacing 12-fiber ribbon for
dense packaging and easy handling in narrow spaces. We also describe the 90°-bent connector which has guide-pins
splice able with conventional 12MT-connector, a 5Gbit/s×12ch parallel-optical module and these characteristics. Our
developing optical interconnection system include the 90°-bent with R=1mm connector and parallel module have good
performances for the practical use.
Polymer optical waveguide devices are getting popular for next generation FTTH application. In order to accelerate the development of polymer optical devices, evaluation of waveguide characteristics should be speeded up. Polymer optical chip containing a combination of 45°-angled cut waveguide, Y-splitter and S-bend structures was designed and fabricated for simple evaluation of multimode waveguides. Input launching such as light source, mode scrambler was investigated for reliable measurement.