Ultrahigh-speed optical time-division-multiplexed transmission technology based on optical signal processing

Kawanishi, S.

doi:10.1109/3.726595

Cited by 197 publications

(56 citation statements)

References 133 publications

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“…A proliferation of various wavelength division multiplexing (WDM) components and systems in recent years has permitted rapid increases in fiber optics network capacity [1,2]. With the advent of Dense WDM (>80 wavelengths) and high-speed time division multiplexed (TDM) systems (>10 Gb/s), there is an increasing need for replacing slow and bulky conventional electronic routers and switches with photonic components.…”

Section: Introductionmentioning

confidence: 99%

3D photonic integrated circuits for WDM applications

et al. 1999

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The wafer fusion technique for realization of compact waveguide switches, filters and 3D photonic integrated circuits is investigated theoretically and experimentally. Calculations based on the beam propagation method show that very short vertical directional couplers with 40-220 µm coupling lengths and high extinction ratios from 20 to 32 dB can be realized. These extinction ratios can be further improved using a slight asymmetry in waveguide structure. The optical loss at the fused interface was investigated by comparison of the transmission loss in InGaAsP-based ridge-loaded waveguide structures with and without a fused layer near the core region. This reveals an excess loss of 1.1 dB/cm at 1.55 µm wavelength due to the fused interface. Fused straight vertical directional couplers have been fabricated and characterized. Waveguides separated by 0.6 µm gap layer exhibit a coupling length of 62 µm and a switching voltage of about 12 volts. Since GaAs and InP have different material dispersion at 1.55 µm wavelength, a combination of InP and GaAs couplers is used to demonstrate an inherent polarization independent and narrowband filter.

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Section: Introductionmentioning

confidence: 99%

3D photonic integrated circuits for WDM applications

et al. 1999

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“…The development of future Terabit all-optical communication systems exploiting Optical Time Division Multiplexing (OTDM) will require stable laser sources around 1.55 µm producing sub-picosecond pulses [1]. A simple and reliable technique for pulse generation around 1.55 µm is the gain-switching of semiconductor laser diodes.…”

Section: Introductionmentioning

confidence: 99%

Optimised design of fibre-based pulse compressor for gain-switched DFB laser pulses at 1.5 [micro sign]m

et al. 1999

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An optical-fibre based pulse compressor for gain-switched DFB laser pulses has been optimised using a systematic procedure based on the initial complete characterisation of the laser pulses, followed by numerical simulations of the pulse propagation in different types of fibre to determine the required lengths for optimum compression.Using both linear and nonlinear compression techniques, an optimum compression factor of 12 is achieved.2

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“…Picosecond pulse generation can be accomplished through various methods, such as external modulation of a continuous-wave (CW) light signal [4], mode locking [5], and gain switching [6]. Gain switching of a semiconductor laser diode is probably one of the most reliable methods to generate optical pulses, and by employing self seeding [7] of a gain-switched Fabry-Pérot (FP) laser, it is possible to obtain high-quality wavelength tunable single-mode pulses which have low timing jitter and good spectral purity.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, next-generation WDM systems that employ dynamic provisioning with the use of wavelength tunability are attracting a lot of interest. Thus, the key requirements on picosecond pulse sources to be used in high-speed communications applications will include broad wavelength tuning range, a high side-mode suppression ratio (SMSR), variable repetition rates, low timing jitter, and small frequency chirp [2]- [4].…”

Section: Introductionmentioning

confidence: 99%