Differential 8-APSK monolithically integrated dual-EML transmitter for flexible coherent PONs

© 2019 Optical Society of America. One print or electronic copy of this version author final draft, may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited.We experimentally demonstrate a simultaneous amplitude and phase modulation of a monolithically integrated dual electro-absorption modulated laser. The proposed technique combines a 4-ary direct phase modulation with a two-level amplitude modulation obtaining an 8-ary amplitude phase shift keying external-modulator-free transmitter (Tx). Its performance was tested up to 7.5 Gb/s in a 25 km single-mode fiber link with intradyne coherent detection. A receiver sensitivity of -42.5¿¿dBm was achieved at a forward error correction limit bit error ratio =4×10-3. The results show that the proposed system can be an efficient flexible Tx for next-generation passive optical networks.Peer Reviewe