Characterisation of thermal crosstalk-induced wavelength shift in monolithic InP dual DFB lasers PIC

Abstract

We present dual DFB lasers each integrated with one heater developed in a generic foundry platform. The thermal effects are experimentally investigated and exhibited a continuous wavelength difference tuning of 0-12.33 nm.

Modeling the Performance of the Clock Phase Caching Approach to Clock and Data Recovery

“…Another possible approach to mitigate the impact of this effect is to disaggregate the light sources from the switches, using tuneable lasers and wavelength demultiplexers/multiplexers for switching [24]. However, the thermal crosstalk between tuneable lasers on the same photonic circuit may cause unwanted wavelength shifts that degrade system performance [25]. In addition, demultiplexer/multiplexers may perform poorly in an unpredictable thermal environment, causing degraded performance or link failure due to thermally dependent wavelength drift [22], [24].…”

“…Fig. 5 illustrates the clock phase movement of an ideal bangbang phase interpolator CDR for different initial clock phase offsets, φ 0 , as described by (25).…”

“…2) This pulse shape was then cross-correlated with a Gaussian jitter PDF using (20) to generate a look-up-table of BER as a function of clock phase offset, which includes the impact of Gaussian jitter. 3) A series of initial clock phase values between -0.5 and 0.5 symbols were used with (25) to generate clock phase offset values as a function of time since the beginning of packet reception, t, and initial clock phase offset, φ 0 . 4) These clock phase offset values were then used with the look-up-table of BER as a function of pulse shape and jitter generated in Step 2) to generate BER as a function of time since the beginning of packet reception, t, and initial clock phase offset, φ 0 .…”

Clock-Synchronized Clock and Data Recovery to Enable Sub-Nanosecond Optically-Switched Networks

“…One possible approach to mitigate this impact is to disaggregate the light sources from the switches and use tuneable lasers and wavelength demultiplex/multiplex for switching [13]. However, the thermal cross talk between tuneable lasers on the same photonic circuit may cause unwanted wavelength shifts that degrade system performance [14]. In addition, multiplexer/multiplexers may perform poorly in an unpredictable thermal environment, causing degraded performance or link failure due to the thermal dependent wavelength drift [12,13].…”