Spectral slicing passive optical access network trial

Abstract

extinction ratio could be increased further by a proper choice of splitting ratios of the couplers [10]. The wavelength resolution limit of the OSA also limits a precise measurement of the actual extinction ratio. The minimum possible change in the FSR during tuning of the MZI by this technique was somewhat difficult to estimate due to the following reason: the smallest real-time change in the FSR during tuning was much less than the resolution of the OSA. Further, the effect of this small change was difficult to record during the tuning process because of short-duration smallscale fluctuations that take place in the online response of the MZI in real time. The effect of the increase in loss during this process was also visible in the output spectrums (compare the reference level RL in Figs. 3 and 4). The difference between the peak-topeak powers at the two complementary output ports increases due to the losses that occurred during the tuning process. This can be exploited to our advantage: if the first coupler is not a perfect 3-dB one, then by introducing appropriate loss in one of the arms of the MZI, equal power distributions at the output ports can be achieved. CONCLUSIONWe have presented a simple technique to tune the channel spacing and channel wavelengths of an all-fiber MZI-based wavelength interleaver. This technique involves selective heating and controlled stretching of one of the arms of the MZI. We have demonstrated the applicability of the technique by fabricating a singlestage MZI-based wavelength interleaver with a stable wavelength response. Using this technique, the results of successfully realized wavelength interleavers with channel wavelengths conforming to ITU grids and channel-spacing values of 25 and 50 GHz were also presented.

Broadband Access Networks and Services in Korea

“…However, its performance is inherently limited by the intensity noise induced by the mode partition and/or the mode fluctuation [21,22]. The F-P SLD can be converted to a single mode laser by injection locking with an extra stable singlemode coherent light source, but it is not cost-effective, since we need a stable coherent source [23,24]. Reflective semiconductor optical amplifier (R-SOA) was used to modulate and amplify the spectrum-sliced broadband noncoherent light source and coherent laser light source [25,26].…”

Performance of Carrier Reused Upstream Transmission in FP-LD Based WDM-PONs

“…So far, many techniques have been proposed, including spectrum-slicing of light-emitting diodes (LEDs) [1] and amplified spontaneous emission (ASE) source [2], wavelength-seeded reflective semiconductor optical amplifiers (SOAs) [3], self-seeding SOAs [4], injection locking of Fabry Perot laser diodes (FPLDs) and downstream wavelength remodulation. Among them, the wavelength remodulation scheme is promising.…”

Fiber-to-the-Home Services Based on Wavelength-Division-Multiplexing Passive Optical Network

“…However, its performance is inherently limited by the intensity noise induced by the mode partition and/or the mode fluctuation [14], [15]. The F-P SLD can be converted to a single-mode laser by injection locking with an extra stable single-mode coherent light source [16], [17], but it is not cost effective, since we need a stable coherent source. A reflective semiconductor optical amplifier (R-SOA) was used to modulate and amplify the spectrum-sliced broad-band noncoherent light source and coherent laser light source [18], [19].…”