Hiroyuki Uenohara

Tokyo Institute of Technology

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Analytical investigation of all-optical FEC coding scheme with convolutional code

Yohei Aikawa Hiroyuki Uenohara

In this paper, we propose an optical forward-error-correction (FEC) coding scheme with convolutional code using FWM in a HNLF to realize adaptive coding scheme corresponding to the signal-to-noise ratio between nodes. The performance of the proposed scheme was analytically investigated for 2 ¹¹ -1 PRBS DPSK-modulated RZ format signals at 10Gbps. The insertion losses of the FEC coding circuit were approximately 0.5 and -0.8dB at BER = 10 ^-9 in the cases of two- and three-input optical XOR operations, respectively, indicating that the proposed scheme offers a net coding gain.

Forward error correction

Convolutional code

Coding gain

10.1109/ps.2015.7329019

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Citations (1)

OFDM to OTDM conversion by fractional Fourier transform

Gabriella Cincotti Satoshi Shimizu Naoya Wada Hiroyuki Uenohara Kunihiro Hattori

A pioneering energy-efficient all-optical system to transform an OFDM signal into an OTDM data flow is proposed and experimentally demonstrated for the first time, based on an innovative fully passive AWG device that implements the fractional Fourier transform.

SIGNAL (programming language)

10.1109/mwp.2014.6994488

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Switching performance of an optical label switch using optical digital-to-analog conversion-based header processor with self-gate-pulse-generator and power equalizer

Hiroyuki Uenohara

Optical header recognition with self-gate-pulse-generation and power equalization of an optical digital-to-analog converter was achieved. Header recognition with 3 dB input dynamic range and optical label switch performance were realized. (2 pages)

Header

10.1049/cp:20050799

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Analytical investigation of possibility of a phase sensitive amplifier based on four wave mixing in a semiconductor optical amplifier

26th Optoelectronics and Communications Conference (2012)

Koichi Saito Hiroyuki Uenohara

We numerically investigated the possibility of a phase sensitive amplifier based on a semiconductor optical amplifier. Suppression of phase variation was confirmed in the dual-pump degenerate four wave mixing method.

Four-wave mixing

10.1109/oecc.2012.6276646

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Demonstration of an all-optical T-type Flip-Flop using counter-faced SOA-MZIs

17th Microopics Conference (MOC) (2011)

Satoshi Shimizu Hiroyuki Uenohara

We experimentally realized an all-optical T-type Flip-Flop using counter-faced SOA-MZIs that can be available for DPSK encoder for the first time. The possibility of achieving stable T-FF operation conditions with asymmetric MZIs is confirmed.

Flip-flop

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Insertion of cyclic prefix for all-optical fractional OFDM

T. Nagashima Gabriella Cincotti T. Murakawa Satoshi Shimizu Makoto Hasegawa

Cyclic prefix

Prefix

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Cost effective all-optical fractional OFDM receiver using an arrayed waveguide grating

Optical Fiber Technology (2016)

T. Nagashima Gabriella Cincotti T. Murakawa Satoshi Shimizu Makoto Hasegawa

Arrayed waveguide grating

Waveguide

10.1016/j.yofte.2016.10.004

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Citations (6)

Investigation of switch reduction of a multi-dimensional optical node for spatial division multiplexing networks

International Conference on Photonics in Switching (2016)

Hiroki Sasago Hiroyuki Uenohara

We propose multi-dimensional optical nodes with multicore fiber input and output. Compared with conventional WSS-based ROADM, reduction rate of switches of 23% and cumulative loss reduction from 96dB to 16dB are confirmed in simulation.

Optical cross-connect

Optical add-drop multiplexer

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GaAlAs/GaAs MOCVD Growth for Surface Emitting Laser

Japanese Journal of Applied Physics (1987)

Fumio Koyama Hiroyuki Uenohara Takahiro Sakaguchi Kenichi Iga

A GaAlAs/GaAs Metalorganic chemical vapor deposition (MOCVD) has been introduced for growing GaAlAs/GaAs wafers with a thick active layer ( d \cong3 µm) and multilayer Bragg reflectors for surface emitting lasers. A nominal threshold current density as low as 3.6 kA/cm 2 µm was obtained in stripe cleaved lasers with a cavity length of 400 µm. GaAlAs/GaAs surface emitting lasers were fabricated by using these MOCVD grown wafers. The room-temperature pulsed operation of an MOCVD grown laser was obtained with a threshold current of 300 mA as a primary demonstration. In addition, a reflectivity of 97% was achieved by a Zn-doped 30 layer Ga 0.9 Al 0.1 As/AlAs Bragg reflector. These experimental results suggest the possibilities of a low-threshold surface emitting laser grown by MOCVD and potential applications toward integrated optics based on surface emitting lasers.

10.1143/jjap.26.1077

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Citations (34)

The Road to Realize Network World using Optical Signal Processing

The Japan Society of Applied Physics (2015)

Hiroyuki Uenohara

SIGNAL (programming language)

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