Demonstration of 1 Gb/s$\,\times \,$15-User CDM Over WDM-PON Using Electrical Spatial Coding and Subcarrier Multiplexing

Abstract

The downlink transmission of a 1 Gb/s 15-user code-division multiplexing (CDM) over wavelength-division-multiplexing passive optical network (WDM-PON) based on electrical spatial coding and subcarrier multiplexing is experimentally demonstrated. Two wavelengths with 100-GHz spacing are used to carry the 15 spatial encoded subcarriers generated by an arbitrary waveform generator. Our results show that error-free operation can be achieved after 20-km standard single-mode fiber (SSMF) transmission when 15 simultaneous users are present assuming that forward-error correction coding is used.Index Terms-Code-division multiplexing (CDM), digital signal processing (DSP), passive optical network (PON), subcarrier multiplexing.

Impact of ADC Bandwidth and Clipping Ratio on COF-PON Systems Based on Spatial Coding and Subcarrier Multiplexing

“…Recently, we have proposed and experimentally demonstrated a novel CDM over fiber PON scheme based on spatial coding and subcarrier multiplexing [4], [6]. The basic concept of spatial coding and subcarrier multiplexing is depicted in Fig.…”

“…3) Subcarrier multiplexing increases the spectrum efficiency and avoids massive usage of optical components, as compared with [5]. More importantly, using both spatial coding and subcarrier multiplexing offers us coding gain when the number of simultaneous users is smaller than the number of subcarriers (code length) [6]. 4) Coherent detection and DSP technologies can be adopted, enabling very high receiver sensitivity, thus can support ultra long distance PON.…”

The demonstration of <inline-formula><math display="inline" overflow="scroll"><mrow><mn mathvariant="bold">10</mn><mtext> </mtext><mtext> </mtext><mi>Gbit</mi><mo>/</mo><mi mathvariant="normal">s</mi></mrow></math></inline-formula> time division multiplexing and <inline-formula><math display="inline" overflow="scroll"><mrow><mn mathvariant="bold">2.5</mn><mtext> &l

“…Currently, TDM-based PON (EPON and GPON) is widely deployed. Recently, ECDM as multiplexing technology for PON downstream was proposed and demonstrated, [1][2][3] in which the electrical CDM en/decoding were, respectively, realized in digital/analog methods or offline processing on computer. The coexistence of ECDM with other technology was also proposed.…”