QAM-GFDM of Dual-Mode VCSEL Mixed 28-GHz MMW Carrier for Fiber-Wireless Link
Journal
Journal of Lightwave Technology
Journal Volume
39
Journal Issue
19
Pages
6076-6084
Date Issued
2021
Author(s)
Abstract
An optical heterodyned 28-GHz carrier generation is demonstrated for synthesizer-free fifth-generation (5G) millimeter wave over fiber (MMWoF) link by using orthogonally polarized dual-mode vertical-cavity surface-emitting laser (VCSEL) as the frontend transmitter, and the power envelope detection is employed for self-heterodyne down-conversion of the generalized frequency division multiplexing (GFDM) data stream. The demonstrated MMWoF link exhibits superior immunity to the residual frequency and phase noises as well as the inter-carrier interference induced by the free-running dual-mode carrier. For back-to-back optical downstream wireline transmission, the receiving GFDM data optimizes its bit error rate (BER) to 2.2×10-4 by adjusting the bias current of the dual-mode VCSEL to 8 mA (3 Ith), and by grouping the GFDM data matrix with total symbols of N = K×M with K = 2 subcarriers and M = 24 timeslots. After a long-reach delivering the optical data stream over 50-km dispersion-managed single-mode fiber (DM-SMF), the qualified receiving power sensitivity is -12 dBm, whereas the decoding GFDM data reveals improved receiving sensitivity with an extremely low power penalty of only 0.3 dB. For the wireless transmission after optical downstream receiving at the remote node, the self-heterodyned MMW carrier exhibits peak power of -62.3 dBm and carrier-to-noise (CNR) of 26.8 dB over long-reach 50-km DM-SMF downstream optical link. In comparison with the mutual heterodyned from two incoherent optical carriers, the self-heterodyned frequency fluctuation can be suppressed from >500 to <330 MHz with significantly suppressed phase noise. After wireless delivering over 2 m in free space, the self-heterodyne down-conversion by power envelope detection guarantees the down-converted quadrature amplitude modulation GFDM (QAM-GFDM) data stream with an average power of -48.4 dBm after optimizing the impedance matching by selecting the appropriate frequency response of the power envelope detector. As a result, the wireless MMW transmission of 8-Gbit/s 4-QAM GFDM data stream is qualified with error vector magnitude (EVM) of 16.9%, signal-to-noise ratio (SNR) of 8.5 dB, and BER of 3.8×10-3. By combining the free-running dual-mode source with two advanced techniques including mode-power equalization and self-heterodyned power envelope detection, the proposed synthesizer-free MMWoF network has demonstrated excellent immunity to the phase/frequency noise, inter-carrier interference which is particularly suitable for building up the compact and simplified optical transmitter and microwave receiver modules with cost-effective MMW self-heterodyne scheme. ? 1983-2012 IEEE.
Subjects
1550-nm VCSEL
5G
Dual-mode
GFDM
millimeter-wave over fiber (MMWoF)
optical heterodyne
orthogonal polarization
power envelope detection
self-heterodyne down-conversion
synthesizer-free
weakly injection-control
5G mobile communication systems
Bit error rate
Charge carriers
Cost effectiveness
Data streams
Delta modulation
Frequency response
Light transmission
Microwave devices
Millimeter waves
Optical frequency conversion
Optical heterodyning
Optical transceivers
Optical transmitters
Phase noise
Signal to noise ratio
Single mode fibers
Surface emitting lasers
Carrier generation
Error vector magnitude
Frequency fluctuation
Generalized frequencies
Inter carrier interference
Microwave receiver
Power equalization
Wireless transmissions
Quadrature amplitude modulation
Type
journal article