Optical Signal Processing by Phase Modulation and Subsequent Spectral Filtering Aiming at Applications to Ultrafast Optical Communication Systems

This paper describes optical signal processing based on optical phase modulation and subsequent optical filtering, which is applicable to 160-Gb/s optical time-division multiplexed (OTDM) subsystems. Ultrafast phase modulation of an optical signal is done by self-phase modulation (SPM) and cross-phase modulation (XPM) when an optical pulse passes through a nonlinear optical fiber. Such phase modulation induces the spectral shift of the optical signal. Various types of optical signal processing are realized simply by filtering out the spectral-shifted component. Using SPM-based pulse reshaping in a 500-m-long silica-based highly nonlinear fiber (HNLF), we demonstrate highly stable generation of a 10-GHz 2-ps optical pulse train tunable over the entire C band. A phase-locked loop (PLL) can suppress the slow phase drift of the output pulse train induced by fluctuations of the nonlinear fiber length, enabling the application of the pulse generator to a 160-Gb/s OTDM transmitter. Based on XPM in a 2-m-long photonic crystal fiber, optical time-division demultiplexing of 160-Gb/s optical signals is demonstrated. The long-term stability is drastically improved as compared with the device composed of a conventional silica-based HNLF, because the short fiber length reduces the phase fluctuation between the signal and control pulses. Instead of nonlinear fibers, an electrooptic modulator such as a (LN) modulator also performs the phase modulation in a more practical manner. We propose and demonstrate an optoelectronic time-division demultiplexing scheme for a 160-Gb/s OTDM signal, which consists of an LN phase modulator driven by a 40-GHz electrical clock and an optical bandpass filter (BPF). We also demonstrate base-clock recovery from a 160-Gb/s optical signal with an optoelectronic PLL. The phase comparator is simply composed of an LN phase modulator and an optical BPF, ensuring the stable and reliable operation in the 160-Gb/s receiver.

[1]  K. Inoue.  Four-wave mixing in an optical fiber in the zero-dispersion wavelength region , 1992 .

[2]  Hiroshi Ito,et al.  320 Gbit/s optical gate monolithically integrating photodiode and electroabsorption modulator , 2003 .

[3]  K. Sato,et al.  Actively mode-locked strained-InGaAsP multiquantum-well lasers integrated with electroabsorption modulators and distributed Bragg reflectors , 1996 .

[4]  Hitoshi Murai,et al.  EA Modulator-Based Optical Multiplexing/Demultiplexing Techniques for 160 Gbit/s OTDM Signal Transmission , 2005, IEICE Trans. Electron..

[5]  Tadasi Sueta,et al.  Optical pulse compression using high-frequency electrooptic phase modulation , 1988 .

[6]  E. Tangdiongga,et al.  Clock recovery and demultiplexing performance of 160-gb/s OTDM field experiments , 2004, IEEE Photonics Technology Letters.

[7]  T. Kanamori,et al.  Ultrafast all-optical switching using highly nonlinear chalcogenide glass fiber , 1992, IEEE Photonics Technology Letters.

[8]  Govind P. Agrawal,et al.  Nonlinear Fiber Optics , 1989 .

[9]  M. Nakazawa,et al.  Ultrastable harmonically and regeneratively modelocked polarisation-maintaining erbium fibre ring laser , 1994 .

[10]  P.J. Winzer,et al.  107-gb/s optical signal generation using electronic time-division multiplexing , 2006, Journal of Lightwave Technology.

[11]  K. Taira,et al.  Picosecond pulse generation with high extinction ratio employing electroabsorption modulator, fibre compressor, and self-phase-modulation-based pulse reshaper , 2004 .

[12]  尾辻 泰一.  10-80-Gb/s highly extinctive electrooptic pulse pattern generation , 1996 .

[13]  Takuo Tanemura,et al.  Use of 1-m Bi2O3 nonlinear fiber for 160-Gbit/s optical time-division demultiplexing based on polarization rotation and a wavelength shift induced by cross-phase modulation. , 2005, Optics letters.

[14]  G. Raybon,et al.  100 Gb/s: ETDM Generation and Long Haul Transmission , 2007 .

[15]  M. Matsumoto.  Analysis of optical regeneration utilizing self-phase modulation in a highly nonlinear fiber , 2002, IEEE Photonics Technology Letters.

[16]  K. Inoue,et al.  Wavelength conversion experiment using fiber four-wave mixing , 1992, IEEE Photonics Technology Letters.

[17]  J. Leuthold,et al.  40 Gbit/s pseudo-linear transmission over one million kilometers , 2002, Optical Fiber Communication Conference and Exhibit.

[18]  Masatoshi Saruwatari,et al.  Generation of highly stable 20 GHz transform-limited optical pulses from actively mode-locked Er/sup 3+/-doped fibre lasers with an all-polarisation maintaining ring cavity , 1992 .

[19]  D. M. Atkin,et al.  All-silica single-mode optical fiber with photonic crystal cladding. , 1996, Optics letters.

[20]  S. Kawanishi,et al.  Ultra-high-speed PLL-type clock recovery circuit based on all-optical gain modulation in traveling-wave laser diode amplifier , 1993 .

[21]  K. Taira,et al.  Highly-nonlinear bismuth oxide-based glass fibers for all-optical signal processing , 2002, Optical Fiber Communication Conference and Exhibit.

[22]  B.-E. Olsson,et al.  All-optical demultiplexing using fiber cross-phase modulation (XPM) and optical filtering , 2001, IEEE Photonics Technology Letters.

[23]  Gregory Raybon,et al.  160 Gbit/s clock recovery using electroabsorption modulator-based phase-locked loop , 2000 .

[24]  Koji Igarashi,et al.  Optoelectronic time-division demultiplexing of 160-Gbit/s optical signal based on phase modulation and spectral filtering. , 2007, Optics express.

[25]  P. Mamyshev.  All-optical data regeneration based on self-phase modulation effect , 1998, 24th European Conference on Optical Communication. ECOC '98 (IEEE Cat. No.98TH8398).

[26]  Colja Schubert,et al.  160 Gbit/s optical 3R-regenerator in a fiber transmission experiment , 2003, OFC 2003 Optical Fiber Communications Conference, 2003..

[27]  Peter A. Andrekson,et al.  OTDM demultiplexer based on XPM-induced wavelength shifting in highly nonlinear fiber , 2003 .

[28]  Colja Schubert,et al.  160 Gbit/s clock recovery with electro-optical PLL using bidirectionally operated electroabsorption modulator as phase comparator , 2003 .

[29]  D. Blumenthal,et al.  A simple and robust 40-Gb/s wavelength converter using fiber cross-phase modulation and optical filtering , 2000, IEEE Photonics Technology Letters.

[30]  Masataka Nakazawa,et al.  Ultrafast nonlinear optical loop mirror for demultiplexing 640 Gbit/s TDM signals , 1998 .

[31]  David J. Richardson,et al.  Holey optical fibers: an efficient modal model , 1999 .

[32]  K. Taira,et al.  Highly nonlinear bismuth oxide-based glass fibres for all-optical signal processing , 2002 .

[33]  H. Takara,et al.  Error-free 500 Gbit/s all-optical demultiplexing using low-noise, low-jitter supercontinuum short pulses , 1996 .

[34]  Naoki Sugimoto,et al.  Dispersion Shifted Bi2O3-based Photonic Crystal Fiber , 2006, 2006 European Conference on Optical Communications.

[35]  G. Lehmann,et al.  Integrated 100 Gbit/s ETDM Receiver in a Transmission Experiment over 480 km DMF , 2006, 2006 Optical Fiber Communication Conference and the National Fiber Optic Engineers Conference.

[36]  G. Agrawal.  Fiber‐Optic Communication Systems , 2021 .

[37]  M. Nishimura,et al.  Silica-based functional fibers with enhanced nonlinearity and their applications , 1999 .

[38]  C. Doerr,et al.  A supercontinuum source based on an electroabsorption-modulated laser for long distance DWDM transmission , 2000, IEEE Photonics Technology Letters.

[39]  A. Ellis,et al.  100 Gbit/s optical clock recovery using electrical phaselocked loop consisting of commercially available components , 2000 .