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We propose and experimentally demonstrate a low-cost symmetric long-reach high-capacity access structure enabled by a lite coherent receiver. 50-Gb/s/λ 16-QAM transmission with 40.1-dB link-budget is achieved to surpass specifications in NG-PON2.

An MMW 5G-FWA system is experimentally demonstrated with bit-loading OFDM and a 4-channel beamforming receiver. 9 Gb/s data rate is achieved after 25-km transmission with similar BER performance of 0° and 60° incident angles.

Tomlinson-Harashima precoding is proposed to relax the requirements of device bandwidth, linearity, and power consumption for resilient MMW-RoF network. A 16.8-dB BER improvement is experimentally demonstrated by the proposed precoding scheme subjecting to bandlimited operations.

Data throughput enhanced tri-color optical transmitter with single-mode modulation for 28-GHz photonic millimeter-wave over fiber link in 50-km-long SMF is demonstrated to achieve QAM-OFDM baseband data rates of 18-Gb/s optical and 12-Gb/s 3-m wireless communications.

We experimentally apply MC-CDMA based on OFDM to a 2-meter transmission phosphor-based LED VLC system. MC-CDMA provides highly uniform per-user performances and thus enhances the available communication bandwidth.

A self-polarization diversity mechanism in a polarization division multiplexing direct detection optical OFDM radio-over-fiber system's backhaul is proposed and demonstrated to double the channel capacity and service coverage without polarization tracking mechanism and receiver modification.

A multicarrier code division multiple access technique is experimentally demonstrated to enhance both the power budget and the network flexibility in an IMDD PON with equalized receiving performance among all subscribers over 50 km transmission.

A novel back propagation isolation module is firstly implemented at its powered remote node of the fiber-wireless convergence. Bi-directional multiband transmission, highly uniform receiving performance, and high compatibility are achieved in a long reach scheme.

The direct-detected optical OFDM spectral efficiency has been enhanced with three reviewed solutions, a multiband scheme, a receiver DSP scheme, and a PDM scheme. A self-polarization diversity PDM scheme guarantees SE enhancement with conventional receivers.

A carrier centralized bi-directional 150/60 Gbps hybrid DDO-OFDM/Nyquist-WDM Long Reach PON is experimentally demonstrated. Uniform performance, high spectral efficiency, asynchronous upstream manipulation, and 1:1024 splitting ratio are achieved.

A 120-Gb/s double-sided multiband DDO-OFDM based LR-PON architecture is proposed and experimentally demonstrated. With a simple receiver design, the implementation complexity can be reduced and the splitting ratio can be as high as 1:128.

We propose and experimentally demonstrate a simple doubled-sided multiband direct-detection optical OFDM receiving system. An aggregated 172.8-Gb/s data rate and a 2.73-b/s/Hz spectral efficiency of total 6 signal bands are carried by one optical carrier.

In this paper, we’ll review some latest results in improving the spectral efficiency and receiving sensitivity in both the electronic and optical domains of a direct-detected optical OFDM signal.