Aiming to become the global leader in chip-scale photonic solutions by deploying Optical Interposer technology to enable the seamless integration of electronics and photonics for a broad range of vertical market applications

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What is so special about POET’s waveguide filtering capability?

fairchijisback

Oct 20, 2019 12:47AM

Re: What is so special about POET’s waveguide filtering capability?

Babaoriley

Oct 20, 2019 01:30AM

fairchijisback

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Re: What is so special about POET’s waveguide filtering capability?

in response to

What is so special about POET’s waveguide filtering capability?

fairchijisback

posted on Oct 20, 2019 11:40AM

Just to add a little clarity re Suresh's comment: The same thing is true here: the lasers move.

The lasers do not physically move but the wavelength that the laser emits does move. It shifts based on the operating temperature and characteristics of the laser. Thus it is important that the flat box shape that is represented as the received wavelength have a wide enough range and spacing so that wavelength drift will still be received as the intended channel.

I would also like to add that there are many standards for 400G. But the two that POET is building covers the reach and the advantages that industry requires for data center applications that a Tier 1 customer would want.

THE 400G OVERVIEW

IEEE P802.3bs

The table below describes the IEEE Application Acronyms for 400G.

Please note that for formfactor QSFP-DD and OSFP the electrical interface will always operate at 8 x 50G (PAM4).

acronym	optical lanes	speed per optical lane	distance	wavelength	comment
DR	1	100G (PAM4)	500m	1310nm	used for 100G QSFP28 with single lambda working at 112G
DR4	4	100G (PAM4)	500m	1310nm	PSM, breakout with DR possible
DR4+	4	100G (PAM4)	2km	1310nm	PSM, DR4+ is not a IEEE acronym
FR4	4	100G (PAM4)	2km	1270, 1290, 1310, 1330nm	CWDM, no breakout mode
FR8	8	50G (PAM4)	2km	1270, 1290, 1310, 1330nm	June 2018: haven't seen on any QSFP-DD and OSFP roadmap
LR4	4	100G (PAM4)	10km	1295, 1300, 1305, 1310nm	no breakout mode
LR8	8	50G (PAM4)	10km	1273, 1277, 1282, 1286, 1295, 1300, 1304, 1309nm	June 2018: haven't seen on any QSFP-DD and OSFP roadmap
SR4 2xBIDI	8	50G (PAM4)	100m	850/910nm	400G with MPO12 (instead MPO16). MPO12 is used for 100G SR4 and 40G SR4
SR8	8	50G (PAM4)	100m	850nm	MPO16 required