Performance Evaluation of Bidirectional Optical Amplifiers for Amplified Passive Optical Network Based on Broadband Light Source Seeded Optical Sources

Abstract

We have evaluated the performances of bidirectional optical amplifiers which were suited for the costeffective implementation of amplified bidirectional passive optical networks (PONs). First, we measured the maximum gains of two simple bidirectional optical amplifiers implemented without using any optical components for the suppression of reflected signals. From the results, the maximum gains of two simple bidirectional amplifiers with a broadband light source (BLS) seeded optical source were limited to be 27 dB due to the reflection-induced in-band crosstalk, when the reflectance coefficients were measured to be -33 dB in both directions. Then, we have also implemented a bidirectional optical amplifier with two band splitters for the amplified bidirectional PON where the two different wavelength bands were allocated to the downstream and upstream signals transmission. In our measurement, we confirmed that the maximum gain of bidirectional optical amplifier with two band splitters could be increased to more than 30 dB owing to the efficient suppression of in-band crosstalk.

An Amplified WDM-PON Using Broadband Light Source Seeded Optical Sources and a Novel Bidirectional Reach Extender

“…However, in the amplified PONs using the BLS seeded optical sources, it has been reported that the system's performance could be degraded by the chromatic dispersion and the reflection-induced in-band crosstalk within the transmission fiber [7][8]. In particular, the optical amplifier in-between two fiber links, such as the feeder fiber and the distribution fiber in the PON architectures, could generate the in-band crosstalk components, which in turn would limit the gain of the optical amplifier [9]. In principle, the in-band crosstalk components have the same wavelength as the original signals, thus they could not be simply suppressed with the optical bandpass filter of the optical receiver side.…”

“…Thus, the proposed bidirectional reach extender could suppress efficiently the effect of in-band crosstalk (mainly generated by a double Rayleigh backscattering) in a bidirectional signal transmission over a single fiber. Therefore, the gains of the unidirectional amplifiers in the proposed bidirectional reach extender would not be limited by the in-band crosstalkinduced penalty [9]. A band splitter 3 was used to separate the output spectrum of the wideband optical amplifier (G1) into two parts; one for the wavelength band of downstream signal amplification (i. e. L-band) and the other for the BLS output for the upstream signal generation (i. e. C-band).…”

Application-Centric, Energy-Efficient Network Architecture ACTION, Based on Virtual Optical Slice Core and Deterministic Optical Access Network

“…The first network is the 10G-EPON [22], where the maximum number of ONUs per OLT is 32 and the maximum transmission distance between OLT and ONUs is 20 km and the optical amplifiers are needed when extending the network. Several extended-reach of amplified passive optical networks (PONs) have been proposed [23][24][25]. However, we use the 10G-EPON [22] as a basic PON architecture, which has been already standardized.…”

Time-dependent Analysis of Optical Receivers Using Receiver Eigenmodes

“…In early optical communication systems, shot and thermal noises limit the receiver performances dominantly [1,2]. After the appearance of optical amplifiers, the amplified-spontaneous emission (ASE) becomes the most dominant noise source that mixes with the optical channel at the photo-detector [3][4][5]. For the analysis of optical receivers in the presence of the ASE, there are exact methods using receiver eigenmodes in the time domain [6][7][8][9] and in the optical spectral domain [10][11][12][13].…”