FITEL Photonics Laboratory

Fukushima-shi, Japan

FITEL Photonics Laboratory

Fukushima-shi, Japan

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Matsushita S.-I.,Telecommunications Company | Matsushita S.-I.,FITEL Photonics Laboratory | Miyato T.,Telecommunications Company | Miyato T.,FITEL Photonics Laboratory | And 6 more authors.
Furukawa Review | Year: 2013

Pulsed lasers are increasing in their utilization in the laser marking and in the laser micro material processing because it allow us to control input optical pulse energy into the materials. Pulsed fiber lasers have some advantages such as stability, reliability and high brightness over CO 2 lasers or YAG lasers, so that the latters are being rapidly replaced with the pulsed fiber lasers. To improve the processing throughput and to expand the applicable processing materials, it is necessary to increase the output power and to have some properties such as the linear polarized output or the tunability of the pulse width and the repetition rate. We have developed two types of polarization maintaining pulsed fiber lasers which have a configuration of master oscillator power amplifier (MOPA). One is using the external modulated seed light source for a high power output. The other is using a direct modulated laser diode for a short pulse generation. The seed pulse light is amplified by a polarization maintaining YDF amplifier. We have realized more than 70 W and 13 W output power of 100 ns and 10 ns pulse at 1064 nm, 1 MHz.


Tanizawa K.,Japan National Institute of Advanced Industrial Science and Technology | Kurumida J.,Japan National Institute of Advanced Industrial Science and Technology | Takahashi M.,FITEL Photonics Laboratory | Yagi T.,FITEL Photonics Laboratory | Namiki S.,Japan National Institute of Advanced Industrial Science and Technology
European Conference on Optical Communication, ECOC | Year: 2011

We demonstrate wavelength-preserving parametric tunable dispersion compensator with cascaded polarization-insensitive parametric tunable wavelength conversion based on degenerate FWM in PM-HNLF. Simultaneous dispersion compensation of four channels of 43-Gbit/s NRZ-OOK signal is successfully achieved. © 2011 OSA.


Ishikawa Y.,FITEL Photonics Laboratory | Izawa A.,FITEL Photonics Laboratory | Nekado Y.,FITEL Photonics Laboratory | Yoshiwara M.,FITEL Photonics Laboratory | And 3 more authors.
Furukawa Review | Year: 2010

Recently, with rapid increases in the data volume processed in data centers, great expectations are placed on the introduction of optical interconnects with a transmission speed of higher than 10 Gbps per channel. Whereas optical interconnects show superior performance in terms of long-distance transmission, high-data rate transmission and low power consumption, the advantage mentioned last is presently drawing special attention, as the consciousness for the environment is on the rise among IT equipment manufacturers. Furukawa Electric has been developing a compact 10 Gbps×12 ch parallel optical module that is applicable to both inter-equipment and intra-equipment communications in data centers, and by using low-power consumption ICs and our high-efficiency 1 μm-range VCSEL that allows lowbias current driving, we have recently achieved a low power consumption of 7 mWGbps. This paper presents the structure and characteristics of parallel optical modules.


Uchida Y.,FITEL Photonics Laboratory | Kawashima H.,FITEL Photonics Laboratory | Nara K.,FITEL Photonics Laboratory
Furukawa Review | Year: 2010

Recently, new planar lightwave circuit (PLC) components are under study, in response to the requirement of downsizing and cost reduction, to increase their refractive index difference Δ between cladding and core. Accordingly, we are developing 2.5%Δ silica-based PLCs. However, it is difficult to put the 2.5%Δ silica-based PLCs directly into practical applications because their coupling loss with a single-mode fiber is as high as 2.9 dBfacet, raising a need for developing a spot size converter (SSC) to lower the loss. We have designed here, therefore, a new vertical SSC that has a broad core expanded in both horizontal and vertical directions, and fabricated the vertical SSC by combining plasma enhanced chemical vapor deposition (PECVD) and shadow mask. As a result, it has been confirmed that the use of the vertical SSC can significantly reduce the coupling loss between the 2.5%Δ waveguide and fiber to 0.06 dBfacet.

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