Title :
RSOA Intensity Modulator Frequency Chirp-Enhanced Optical OFDM PON Performance
Author :
Cao, B.Y. ; Deng, M.L. ; Zhang, Q.W. ; Giddings, R.P. ; Wang, M. ; Tang, J.M.
Author_Institution :
Key Lab. of Specialty Fiber Opt. & Opt. Access Networks, Shanghai Univ., Shanghai, China
Abstract :
A reflective semiconductor optical amplifier intensity modulator (RSOA-IM) frequency chirp considerably increases the system frequency response of an intensity-modulation and direct-detection (IMDD) PON system over the passband signal spectral region. Adaptive bit and power loading of optical OFDM (OOFDM) enables full use of the RSOA-IM frequency chirp-enhanced passband system frequency response characteristics. As a direct result, without requiring extra electrical and optical equalization schemes, an RSOA-IM with a 3-dB small-signal modulation bandwidth as low as 1 GHz can support 40 Gb/s OOFDM signal transmissions over 25 km SSMF IMDD PON systems free from optical amplification and chromatic dispersion compensation. This paper suggests that significantly relaxed requirements on both RSOA-IM´s 3-dB small-signal modulation bandwidth and frequency chirp are feasible for achieving desired OOFDM transmission performances for next-generation PONs.
Keywords :
OFDM modulation; frequency response; passive optical networks; semiconductor optical amplifiers; OOFDM signal transmissions; PON performance; RSOA intensity modulator frequency; adaptive bit; chirp-enhanced optical OFDM; direct-detection PON system; distance 25 km; frequency response; intensity-modulation PON system; passband signal spectral region; power loading; reflective semiconductor optical amplifier intensity modulator frequency chirp; OFDM; Optical fibers; Optical modulation; Optical receivers; Optical transmitters; Passive optical networks; Reflective semiconductor optical amplifiers (RSOAs); fiber optics systems; frequency chirp; optics systems and orthogonal frequency division multiplexing (OFDM).; orthogonal frequency-division multiplexing (OFDM);
Journal_Title :
Photonics Journal, IEEE
DOI :
10.1109/JPHOT.2015.2439261
