We demonstrate a new type of Mach-Zehnder interferometer by combining a nonadiabatic microtaper with a long period
grating in the same stage of all solid photonic bandgap fibers. Meanwhile, the mode-coupling caused by the microtaper is
indirectly verified by the interference with the long period grating, which is designed for the resonance between the
fundamental core mode and LP01 cladding supermodes. Finally, the temperature response is also reported.
A novel photonic technique of millimeter-wave (mm-wave) sub-carrier generation using optical parametric loop mirror
(OPLM) and fiber Bragg grating (FBG) is proposed. Due to the four-wave mixing (FWM) effect and loop reflection
characteristic in an OPLM, a carrier-suppressed modulation signal is able to generate two new harmonic components
with six times frequency spacing of the modulation frequency and the initial two optical tones can be reflected back to
the input port by the OPLM itself, which servers as the first order filtering. At the transmission port of the OPLM, a
matching FBG will give further suppressing on the pump light. Finally, a millimeter-wave sub-carrier will be obtained
after the FBG.
A stable dual-wavelength with a tunable wavelength spacing fiber laser based on a chirped two phase-shifted grating
filter is demonstrated. In the ring cavity, a chirped grating with two π-phase shifts servers as an ultra-narrow dualwavelength
transmission band filter. The grating is attached in a triangular cantilever for chirp rate tuning. A
semiconductor optical amplifier biased in low-gain regime is induced to reduce the gain competition of the two
wavelengths caused by erbium-doped fiber. And a feedback fiber loop working as a mode filter guarantees the laser in a
single-longitudinal-mode operation. Two lasing lines with different wavelength spacing from approximately 0.15 to 0.37
nm are experimentally demonstrated.
A hybrid 1D/2D en/decoding O-CDMA system is proposed to support multiple bit rates. To the best of our knowledge, a
hybrid O-CDMA system with 2.5Gb/s (OC-16) and 155Mb/s (OC-3) transmission along the single mode fiber with
length of 60km is first successfully demonstrated. In this experimental demonstration, phase coded SSFBGs with chip
rate up to 320Gchip/s are applied as 1-dimensional en/decoders in 2.5Gb/s transmission while 2D en/decoders are
applied in 155Mb/s real time video transmission. Error free transmission is achieved in 1D encoded 2.5Gb/s link; while
2D encoded 155Mb/s channel carrying video signal can be transmitted along the same fiber. This proposed hybrid
1D/2D en/decoding O-CDMA system can also be used for O-CDMA PONs to reduce the costs at the ONU side.
A novel interrogation scheme for multiplexing the sensors based on long-period grating (LPG) Mach-Zehnder interferometers (MZIs) is proposed. Each LPG-MZI is formed by a pair of cascaded identical LPGs and induces an additional optical path difference (OPD) proportional to the centre-to-centre interval between the two LPGs. A sub-reflectogram including sensing information can be achieved when the OPD induced in one LPG-MZI is compensated by scanning one arm of a Michelson interferometer to a certain range. For multiple sensors, the grating intervals of different LPG-MZIs are set to different values to ensure that their sub-reflectograms can be well separated in time domain. The spectral response of the LPG-MZI is reconstructed from the corresponding sub-reflectogram with a fast Fourier transformation. Applications of the bending and temperature monitoring are demonstrated by measuring the signals in time domain and wavelength domain, respectively.
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