Table 1 Comparison of the microwave filter with other technologies against the figures of merit.
From: Integrable microwave filter based on a photonic crystal delay line
Technology | Filter type | Bandpass/rejected bandwidth (GHz) | Operational bandwidth (GHz) | Central frequency (GHz) | Size | Insertion loss (dB) | Rejection level (dB) | Tunability speed | Tunability range (%) | Power consumption |
|---|---|---|---|---|---|---|---|---|---|---|
PhC | Bandpass/Notch | 8/1–2 | >40/PD and GVD limited | >40/PD and GVD limited | ~mm | 9 | >10/50 | ms | 100 | — |
SOA47 | Notch | 0.001 | 0.03 | 30 | ~mm | 10 | >30 | ps | 100 | Medium |
Brillouin45 | Notch | ~0.1 | PD limited | PD limited | ~km fibre | 0.5 | >30 | μs | 100 | High |
FBG51 | Bandpass | 0.5 | 20 | 6–7.5 | ~cm | 6 | >10 | ms | 70 | — |
Brillouin46 | Bandpass | 0.02 | PD limited | PD limited | ~km fibre | 0 | >30 | μs | 100 | High |
LCoS52 | Bandpass | 0.3 | <20 | 2–3 | ~cm | 1.75 | >30 | s | 25 | — |
Frequency comb23 | Bandpass | 0.17–0.36 | 10 (RF gen. limited) | 5 | ~km fibre | 1 | >60 | ns | 100 | — |
SOI ring20 | Notch | 0.01 | 1 | 20 | ~0.2 mm2 | 10 | >30 | ms | 77 | — |
SOI ring53 | Notch | 0.01 | 1 | 1.7 | ~30 mm2 | 10 | >25 | ms | 100 | — |
Hybrid42 | Bandpass | 3–14 | PD limited | 9–37 | few mm2 | 0 | >25 | ps | 58 | Medium |
MEMS8 | Bandpass | 0.06 | 0.6 | 1.2–1.6 | ~20 cm2 | 4.1 | >15 | ms | 28 | Low |
MW* | Bandpass | 0.02 | 0.4 | 1.8–2.2 | ~cm3 | 2 | >30 | s | 20 | — |
MW† | Notch | 0.015 | 1 | 3–4 | ~cm3 | 0.5 | >40 | s | 29 | — |
