Fiber-wireless transmission system of 108  Gb/sdata over 80 km fiber and 2×2multiple-input multiple-output wireless links at 100 GHz W-band frequency

Abstract

We experimentally demonstrate a seamlessly integrated fiber-wireless system that delivers a 108 Gb/s signal through 80 km fiber and 1 m wireless transport over free space at 100 GHz adopting polarization-division-multiplexing quadrature-phase-shift-keying (PDM-QPSK) modulation and heterodyning coherent detection. The X- and Y-polarization components of the optical PDM-QPSK baseband signal are simultaneously upconverted to 100 GHz wireless carrier by optical polarization-diversity heterodyne beating, and then independently transmitted and received by two pairs of transmitter and receiver antennas, which form a 2×2 multiple-input multiple-output wireless link. At the wireless receiver, two-stage downconversion is performed firstly in the analog domain based on balanced mixer and sinusoidal radio frequency signal, and then in the digital domain based on digital signal processing (DSP). Polarization demultiplexing is realized by the constant modulus algorithm in the DSP part at the receiver. The bit-error ratio for the 108 Gb/s PDM-QPSK signal is less than the pre-forward-error-correction threshold of 3.8×10(-3) after both 1 m wireless delivery at 100 GHz and 80 km single-mode fiber-28 transmission. To our knowledge, this is the first demonstration to realize 100 Gb/s signal delivery through both fiber and wireless links at 100 GHz.

W-band RoF transmission based on optical multi-carrier generation by cascading one directly-modulated DFB laser and one phase modulator

“…It can be seen that compared to the case of no LEAF transmission and no wireless delivery, 1.5-dB power penalty at the BER of 1 Â 10 À 9 is caused by 2-m wireless delivery while almost no penalty is caused by 20-km LEAF transmission. We also measure and confirm that all the pairs of subcarriers spaced at 100 GHz, denoted by (1,9), (2,10), (3,11), (4,12), (5,13), (6,14), (7,15) and (8,16) in Fig. 2(b), exhibit the similar performance.…”

“…Recently, the W-band (75-110 GHz), with wider bandwidth and higher frequency, has attracted increasing interest as a candidate radio-frequency (RF) band to provide multi-gigabit wireless links for mobile data transmission [1][2][3][4][5][6][7][8][9][10][11]. It is well known that it is challenging to generate millimeter-wave (mm-wave) frequencies at W-band based on bandwidth-limited electrical components.…”

“…It is well known that it is challenging to generate millimeter-wave (mm-wave) frequencies at W-band based on bandwidth-limited electrical components. A more attractive solution for the W-band mm-wave generation would be the employment of photonic techniques, such as remote heterodyning [8][9][10][11] and external modulation [12]. Furthermore, photonic mm-wave techniques effectively promote the seamless integration of wireless and fiber-optic networks and can be well applied to the optical wireless integration system, such as the radio-over-fiber (RoF) system.…”

PDM-QPSK vector signal generation by MZM-based optical carrier suppression and direct detection

“…It is well known that intensity modulation and direct detection (IM-DD) is more practical for short-reach or radio-over-fiber (RoF) systems than coherent detection in terms of cost and complexity [1][2][3][4]. Meanwhile, advanced vector signal modulation combined with digital signal processing (DSP), for which data information is encoded into both in-phase (I) and quadrature (Q) components of a carrier, has gained increasing interest from the research community as a method to efficiently improve receiver sensitivity and system spectral efficiency [5][6][7][8][9][10][11][12][13][14][15]. Moreover, the optical polarization multiplexing technique is a practical solution for the future spectrally-efficient high-speed optical transmission to double the capacity of a fiber link [6,16].…”

Fiber-Wireless Transmission System of PDM-MIMO-OFDM at 100 GHz Frequency

“…However, the PDM-QPSK signal in the wireless link cannot be considered as a multiple input multiple output (MIMO) transmission model as only one receiver antenna is used at a time and detection is performed by aligning a transmitter-receiver antenna pair without crosstalk from the other receiver antenna [8]. A PDM-MIMO-QPSK system was experimentally demonstrated, and both fiber link and wireless link in the W-band can be simultaneously considered as 2 2 MIMO model in that system [9]- [12]. With the PDM, the SE can be increased to 2 bit/s/Hz when the QPSK was applied.…”