Silicon Photonics: Failing to Deliver on WDM Promises for the Datacenter

Transcription

1 Silicon Photonics: Failing to Deliver on WDM Promises for the Datacenter Silicon Photonics: Is it still in hype or on its way to the field? OFC 2015 Workshop 22 March 2015 Chris Cole

2 Mainstream Datacenter Optics Bit Rate = Fiber Pairs * Lambdas * Baud Rate * Bits/Baud Standard Bit Rate Fiber Pairs λ Baud Rate Bits /Baud Type 1GbE-LR, SR 1G 1 1 1G 1 Serial 10GbE-LR, SR 10G G 1 Serial 40GbE-SR4 40G G 1 Parallel 40GbE-LR4 40G G 1 WDM 100GbE-SR4 100G G 1 Parallel 100GbE-LR4, CWDM4, CL4 22 March G G 1 WDM 100G PSM4 100G G 1 Parallel WDM = Wavelength Division Multiplexing

3 Luxtera 4x10G (40G) WDM Si Photonics October 2006 press announcement excerpts: Luxtera Inc., the world leader in CMOS photonics, today announced its new technology that multiplexes four 10Gbps wavelengths onto a single fiber, on a production CMOS die resulting in a single fiber 40Gbps link. This advance reduces cost for high bandwidth interconnect over traditional parallel fiber solutions and paves the technological way for next generation 100Gbps Ethernet data center connectivity. Luxtera is currently sampling prototypes to development partners and the company will launch a commercial transceiver product line based on this underlying technology in 2007 years ahead of the competition. 22 March

4 Luxtera 4x10G (40G) WDM Si Photonics A. Narasimha, et. al, A Fully Integrated 4x10Gb/s DWDM Optoelectronic Transceiver in a standard 0.13um CMOS SOI, ISSCC 2007, March

5 Luxtera Si Photonics Today: Single λ Reported 8x25G Parallel Single Mode (PSM-8) SiPIC (8 SMF pairs) Single λ CW laser in external package (lamp) Separate OIC and EIC Now delivering 4x25G (100G) PSM-4 SiPICs!!! Elegant leveraging of SiPIC strengths to develop a compelling product 22 March

6 IBM CMOS 4x25G WDM Si Photonics S. Assefa, et al., International Electron Devices Meeting (IEDM), PD, Dec March

7 Intel 4x10G (40G) WDM Si Photonics A. Alduino, Demonstration of a High Speed 4-Channel Integrated Silicon Photonics WDM Link with Hybrid Silicon Lasers, Intel, 2013 Intel showed 4x25G (100G) modules at the Intel Developer Forum in April 2013, and promised shipment by March

8 Intel Si Photonics Today February 2015 press announcement excerpts Intel has delayed shipment of a component module required for its silicon photonics technology, The original batch of modules, which was supposed to ship at the beginning of the year, failed to meet Intel specifications and quality requirements, Intel spokesman Mark Miller said. New modules are scheduled to ship at the end of this year, meaning silicon photonics cables for connecting servers won t be installed before Intel's Mark O Miller confirmed the quality issues, saying specifically that the first batch of modules didn't operate over the specified temperature range. Miller said we have found the root cause and fixes have been implemented 22 March

9 Cisco 4x25G (100G) WDM Si Photonics 100G LR4 CPAK Module Inside 100G LR4 Module Now delivering!!! LR4 TOSA using SiPIC WDM technology Gold box OSA packaging Comparable metrics to conventional DML and EML based CFP2 modules Cost driven by packaging; SiPIC offers no advantage 22 March

10 Skorpios 4x25G (100G) WDM Si Photonics Skorpios100G CWDM QSFP28 transceiver Deliveries promised last year A. Viglienzoni, Skorpios Delivers on the Promises of Silicon Photonics, Photonic Integration Market Focus Panel, ECOC 2014, 22 Sep March

11 Finisar 2x50G (100G) Si Photonics Serial port MZM driver1 MZM driver 2 PLL TIA/LA 1 PRBS checker PRBS generators TIA/LA 2 RX in TX out Finisar 2x50G PSM-2 SiPIC fabricated at ST Micro WDM requires external CW Lasers, external WDM Mux and DeMux, and WDM grating couplers; no cost advantage 22 March

12 Summary To date SiPIC WDM has had no impact on the Datacenter Mainstream 4x10G (40G) WDM and 4x25G (100G) WDM transceivers (ex. QSFP) are based on DML or EML tech. However many teams are working on productizing SiPIC WDM for the Datacenter: Aurrion Cisco Finisar IBM Intel Luxtera Mellanox (Kotura) Skorpios ST Others Difficult technical challenges can always be solved with focused long-term efforts Suggestion going forward: less promises, more deliveries 22 March

13 SiPICs: Failing to Deliver on WDM Promises Thank you 22 March