Phase noise robust optical heterodyne system for reduced complexity millimeter-wave analog radio-over-fibre

Abstract

Strict optical linewidth/coherence requirements for A-RoF systems are overcome through development of an analog optical heterodyne architecture tolerant to phase noise and carrier offset. Successful generation and reception of a 60GHz UF-OFDM signal using two free-running tunable lasers, without digital phase/frequency offset compensation, is demonstrated.

Flexible V-band mmWave Analog-RoF Transmission of 5G and WiGig signals using an InP-SiN Integrated Laser Module

“…Since the gain sections (SOAs) of L1 and L2 are independent, the optical carriers emitted are non-coherent, giving rise to PN and FO on the produced beat-tone. To alleviate these issues, while still maintaining the wavelength tunability afforded by two independent lasers, we previously implemented a phase noise cancelling (PNC) receiver which eliminates PN and FO arising from the non-coherent optical sources [15]. The trade-off with this implementation is the additional cost and complexity added to the receiver and the use of an IQ modulator at the transmitter.…”

“…To simplify the design we have deployed a simple and low cost analog receiver employing an envelope detector, which then facilitates the use of a single ended Mach-Zehnder modulator (MZM) for amplitude modulation at the transmitter and just a single booster optical amplifier. Of course this simplified system architecture comes at the cost of reduced spectral efficiency compared to [15] and a reduction in receiver sensitivity. Nevertheless excellent performance is achieved.…”

Coherent UD-WDM RoF Fronthaul Network With D-EML Transmitter and Phase-Noise Robust Receiver

“…The authors are with the Department of Signal Theory and Communications, Universitat Politècnica de Catalunya, Barcelona 08034, Spain heterodyne detection between the data and the carrier, which contains phase information of both transmitter (Tx) and receiver (Rx) laser sources [7,8]. The OSSB-FC is achieved by using a dual-electroabsorption-modulated laser (D-EML), resulting in high-quality RF generation and detection using low-cost hardware and maintaining maximum optoelectronic integration.…”

Optical Heterodyne Analog Radio-Over-Fiber Link for Millimeter-Wave Wireless Systems

“…frequency offset (FO)) and phase noise/linewidth on the system performance. The first approach advocates the use of an analog mm-wave receiver [22]; the second approach uses the standard digital signal processing (DSP) algorithms [23], while in the third approach, the use of a photonic integrated mode locked laser (MLL) with reduced DSP compensation [24] is presented.…”