A remnant chromatic dispersion monitoring method based on spectral shift of a semiconductor optical amplifier is proposed for a high speed optical communication system with carrier suppressed return to zero format and single-channel speed of 40 Gbit/s. The monitoring performance can be optimized by carefully selecting the bandwidth and center wavelength of the optical filter. The dynamical monitoring range is ±60 ps/nm and the monitoring precision is about 5 ps/nm. This method is suitable for application in dynamical chromatic dispersion compensation of high speed optical communication systems.
A temperature-insensitive quartz cavity Fabry-Perot etalon is used in an angle-tuned optical filter. A new high precise
orientation technique is introduced to locate the etalon angle precisely based on a position sensitive detector. The tunable
optical filter has high temperature-stability, perfect repeatability and high resolution. The repeatability precision is better
than 0.01 nm. The resolution is 0.004 nm.
In this paper, the index guide and band gap guide polymer microstructured optical fibers are designed. For the index guide fiber, a liquid crystal core is used and 60dB extinction ratio tunable attenuator is obtained. For the bandgap polymer microstructured optical fibers, a regular structure is presented from experiment and an ideal defect can be realized easily by a new method.
We have developed a thermally tunable module to compensate polarization mode dispersion (PMD) and chromatic dispersion (CD) simultaneously. In this module, twins of linearly chirped fiber Bragg gratings (LCFBGs) are used to compensate PMD and one non-linearly chirped FBG (NLCFBG) is used to compensate CD in 40Gb/s optical fiber communication system. The fiber Bragg gratings are coated with uniform thin metal film, and by changing the applied current through the film, the tunable compensation for PMD and CD is achieved. The fabrications of the LCFBG and NLCFBG are both utilizing the linearly chirped phase mask, making the fiber Bragg gratings easy to obtain.
Polarization mode dispersion can decrease the performance of the fiber-optic transmission seriously. Thus the compensation of Polarization mode dispersion is a critical issue in fiber optics. In this paper, a novel Polarization mode dispersion compensator is suggested and demonstrated based on a special-design fiber Bragg grating. A polarization mode dispersion compensation grating with 10-156ps dynamical span and flat-top response is first reported based on the combination of reconstruction algorithm and the equivalent-chirp method. A 10-Gb/s system experiment using the tunable PMD compensator shows the power penalty of BER at is about 1.2dBwhen the PMD of the system is 60ps.
A cost-effective tunable dispersion compensator using reconstruction-equivalent-chirp method is fabricated. Only uniform phase mask, sub-micron precision and uniform thin metal film are required in the fabrication. The group delay ripple is less than 14 ps during the whole tuning range. An experiment in 40-Gb/s system is demonstrated with a power penalty of 0.7dB.
A pure silica microstructured optical fiber(MOF) with seven dual cores is designed for chromatic dispersion compensation by a finite difference frequency domain(FDFD) method with a perfect matched layer(PML) boundary condition. The multi-core structure fiber is presented for the first time. The negative chromatic dispersion peak value of the designed microstructured fiber is -4500ps/nm.km and the full width at half maximum (FWHM) is evaluated at 12nm. Furthermore the effective area of the inner core fundamental mode can reach 65mm2 at 1550nm wavelength, which is three times that of a conventional dispersion compensating fiber (DCF).
Based on a compact 2-D Finite-Difference Time-Domain(FDTD) method, We study the effect of imperfection of transverse periodicity on the leakage loss in photonic crystal fibers(PCFs). Random fluctuations of holes radius and position in PCFs are introduced to analyze their effect on the guiding ability.
In this work, methods of design and fabrication of photonic bandgap structures (PBG) and photonic crystal waveguides based on SOI (silicon on insulator) are presented. In theory, a method that incorporates the plane wave expansion (PWE) method based on supercell with the finite-difference time-domain (FDTD) method with a perfectly matched layer (PML) boundary condition has been investigated. At first, PWE simulation will present a band structure. Then according to the band structure, FDTD tool can simulate a light propagation and can obtain optimized parameters easily. With the method, several photonic crystal devices suitable for 248nm Deep UV lithography and 0.18um ion-beam etching are designed and fabricated.
The well number and the cavity length of 1.55mm wavelength In1-x-yGayAlx MQW DFB lasers are optimized using a simple model. A low threshold, high maximum operating temperature of 550-560K ,and high relaxation oscillation frequency of over 30 GHz MQW DFB laser is presented.
The effect of time-delay-ripples on 40Gbit/s filter cascade system and multispan transmission system is investigated for the first time. It is shown that ripple amplitude basically determine EOP in the practical transmission system.
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