We present a novel upstream burst-mode equalization scheme based on optimized SOA cascade for 40 Gb/s TWDMPON. The power equalizer is placed at the OLT which consists of two SOAs, two circulators, an optical NOT gate, and a variable optical attenuator. The first SOA operates in the linear region which acts as a pre-amplifier to let the second SOA operate in the saturation region. The upstream burst signals are equalized through the second SOA via nonlinear amplification. From theoretical analysis, this scheme gives sufficient dynamic range suppression up to 16.7 dB without any dynamic control or signal degradation. In addition, a total power budget extension of 9.3 dB for loud packets and 26 dB for soft packets has been achieved to allow longer transmission distance and increased splitting ratio.
Detailed numerical investigation of self-seeded colorless ONU transmitter using quantum dot (QD) SOA as the intensity modulator for symmetric 40 Gb/s TWDM-PON has been developed. It is shown that the QD SOA-based intensity modulator is able to support 10 Gb/s OOK upstream signal transmission with an optical extinction ratio of over 10 dB. Chromatic dispersion compensation free of 20 km passive transmission has been achieved for error free reception. Moreover, the system performance and power budget have been analyzed and discussed for different transmission distance and split ratio.
Incorporation of N into GaInAs results in N-localized-states close to the conduction band minimum. Such strong alloy band edge N-localized-states can locally capture carriers, thus lasing directly occurs from them, leading to dualwavelength emission.
Compositional fluctuations of the N in GaInNAs results in QD-like fluctuations in the conduction band minimum. The GaInNAs SOA gain is significantly broadened by adding the gain of both QW and QD-like fluctuations, providing a < 18 dB gain over 107 nm bandwidth cross both C and L bands in NG-PON2 applications.
We experimentally demonstrate all-optical signal processing functions using silicon microring resonators with a
450×250-nm cross section. These results include slow-light delay of phase-modulated data and microwave
photonic signal, wavelength conversion/multicasting, format conversions, optical differentiation, and concentric
micro-ring resonators with deeper notches for label-free bio-sensing applications.
We propose that double broadcast services can be overlaid over high-speed point-to-point downlink data in a WDMPON
with source-free optical network units (ONUs). In the optical line terminal (OLT), a set of single-drive Mach-
Zehnder modulators (MZMs) are driven by downlink point-to-point data to generate a differential phase-shift keying
(DPSK) format. The downlink DPSK signals from different wavelengths are multiplexed and then fed to a following
dual-parallel MZM (DPMZM) as a double broadcast services transmitter. The broadcast service_1 is an optical carrier
suppression (OCS) format, while the broadcast service_2 is an inverse return-to-zero (IRZ) forma. After the transmission,
at each ONU, the optical signals are separated by an optical filter. The filtered OCS signal is detected to retrieve the
broadcast service_1. The DPSK/IRZ signals are split into three parts, one part is detected by an IRZ receiver to recover
the broadcast service_2, the second part is detected by a DPSK receiver to retrieve the downlink data and the third part is
re-modulated by the upstream amplitude shift keying (ASK). We also perform an experiment to verify the feasibility of
the proposed scheme, where the power penalties of less than 1.5 dB are obtained after 25-km transmission with 1.25-
Gb/s data rate.
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