Tunable OTDR based on self-locked RSOA for in-line monitoring of WDM-PON is proposed and demonstrated. The
characteristics of self-locked RSOA were experimentally studied. The tunable OTDR was successfully demonstrated for
a range of 25 nm, having a dynamic range of about 15 dB. Under in-service state of 2.5-Gb/s data, the power penalty
induced by the line monitoring channel was about 0.1 dB at BER of 10-9. The proposed tunable OTDR is cost-effective
and useful to monitor the status of WDM-PON.
A novel photonic microwave notch filter with both negative and positive coefficients is proposed and demonstrated using a single optical source as a probe beam. Due to the change in birefringence induced by another modulated pump beam, both non-inverted and inverted signals are generated in a highly nonlinear fiber. These are separated by using a polarization beam splitter and recombined with optical time delay given to one of them. From the generation of both coefficients and the orthogonal property between them, no resonance peaks were observed at baseband and the optical coherence could be avoided independently of the source coherence length. The experimental results show a stable transfer response with the free spectral range of 65 MHz and 1.32 GHz when the optical path difference is given to 3.19 m and 0.19 m, respectively.
We developed the primary components applicable to HPCF links for short reach (SR) and very short reach (VSR)
data communication systems. We fabricated 4x4 HPCF fused taper splitter, HPCF pigtailed VCSEL and PIN
photodiode for high speed short reach communications and characterized back to back transmission performance of the
link composed of these components by measuring eye diagrams and jitters.
Adapting the fusion-tapering technique for glass optical fiber, we successfully fabricated a 4x4 HPCF fused taper
coupler. The HPCF with a core diameter of 200μm and an outer diameter of 230μm had step refractive index of 1.45
and 1.40 for the core and the clad. The optimized fusion length and tapering waist which make minimum insertion loss
of about 7dB and uniform output power splitting ratio with less than 0.5dB are 13mm and 150µm, respectively.
As a light source for VSR networks, we chose a vertical cavity surface emitting laser (VCSEL) and developed a
package with a HPCF pigtail. After positioning VCSEL and HPCF that made a minimum coupling loss, we glued the
HPCF inside ceramic ferrule housing. In HPCF-PIN PD packaging, we added a micro polymer lens tip onto the HPCF
ends to match the mode field area to the sensitive area of GaAs or InGaAs PIN PD. Coupling between a PIN PD chip
and the lensed HPCF was optimized with the radius of curvature of 156µm with a low coupling loss of 0.3dB, which is
compatible to conventional MMF-PD packaging. For 1.25 Gbps data rate, the eyes adequate to eye mask in gigabit
Ethernet were wide open after all HPCF transmission link and no significant power penalty was observed.
A two-user, 10-Gbits/s optical code-division multiple-access system implemented by using cascaded long-period fiber gratings formed in a dispersion-compensating fiber (DCF) is demonstrated. Our results show that the sensitivity of cladding modes to the refractive index change on the cladding surface is greatly reduced by utilizing the inner-cladding mode of the DCF. Two pairs of encoder/decoder are constructed and the performance is evaluated by measuring bit error rate (BER). With an interferer, a BER of 1.5×10–12 is measured at a received optical power of –6 dBm.
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