Injection-Locked Quantum-Dash Laser in Far L-Band 192 Gbit/s DWDM Transmission

Abstract

Injection locked quantum-dash laser diode-based comb source is employed in wavelength-division multiplexed (WDM) optical transmission covering ~1610 nm L-band optical telecommunication window. An aggregate data rate of 192 Gbits/s (3×32 GBaud-QPSK reaching 7% FEC overhead) is demonstrated over three 50 GHz separated channels in coherent transmission over a 10 km-long single mode fiber. A thorough investigation of the radio-frequency (RF) characteristics of all channels is carried out in terms of the linewidth, phase, and frequency noises, showing minimum values of 44 kHz,-80 dBc/Hz, and 5.2×10 11 Hz 2 /Hz, respectively. Also, an integrated average relative intensity noise of ~-132 dB/Hz is reported for the central channel. To the best of our knowledge, this constitutes the first report and demonstration of a dense WDM (DWDM) in an extended L-band regime using a comb source.

Towards InAs/InP Quantum-Dash Laser-Based Ultra-High Capacity Heterogeneous Optical Networks: A Review

“…Summary of the implementation of quantum dash lasers in optical communication in literature in a chronological order. replacement of the unattainable ML in the L-band, OIL has also been engaged to realize an injection-locked Qdash LD comb source based on generating frequency harmonics of the single locked modes which were used in WDM [42], [43] and MMW [44], [45] demonstrations.…”

“…Lastly, this section is concluded by the recent first demonstration of the simultaneous transmission of multi-carriers in the mid L-band in a DWDM configuration using a single Qdash LD, reported in [42], [43]. The device employed was 700 µm-cavity length and 4 µm-ridge width.…”

“…Firstly, an EIL Qdash LD based comb source was realized by locking a single mode at 1609.47 nm and generating its harmonics with 50 GHz mode-spacing, as shown in Fig. 12(a) [42], [43]. The comb exhibited 7 lines with three central lines exhibiting an OSNR of 30 dB.…”

“…Fig. 12(b) shows the comb source's unmodulated de-interleaved odd and even modes at locations P3 and P4 alongside the recombined 32-Gbaud modulated signal at location P5 [42], [43]. A tunable filter was used at the receiver side to select the desired channel to be received at an OMA.…”