Recently, changes in the relationship between satellite communication networks and ground have led to an increase demands imposed on networks. In this category of networks, low earth orbit (LEO) constellations, which cover entire surface Earth through cooperation among many small satellites orbit, are currently attracting attention. LEO consume power when communicating with terrestrial terminals. However, absence solar light, these must operate using battery energy only. The consumption...

A compact 28 Gb/s × 4-lane transmitter optical subassembly is developed for 100Gb/s Ethernet (100 GbE)/OTU4 applications with a hybrid integrated spatial multiplexer system. The system simply comprises three bandpass filters and mirror, despite the narrow guardband specification. Moreover, by an intensively improved precise lens manipulation technique acting in upward direction addition to horizontally downward, high-coupled power into single-mode output fiber can be achieved, resolving...

We propose a precise submicrometer alignment technique for lenses employing high-power laser irradiation. investigate the mechanism in detail, and show that manipulation of is achieved all directions, tightest positional tolerance. In particular, our proposed enables lens by irradiating only top holder making it suitable high-density integrated multi-channel systems. With this technique, we have successfully developed first lens-coupled hybrid optical system 100 Gbit/s Ethernet transmitter...

We demonstrate tunable DFB laser array with 350 kHz linewidth and low power consumption of less than 0.58 W using backside wavelength monitor, which is suitable for future hybrid or monolithic integration modulators.

A coaxial 10-Gb/s 1.3-/spl mu/m distributed feedback (DFB) laser-diode module with a coupled differential feed has been developed. The cascaded the characteristic impedance of 100 /spl Omega/, which consists 140-/spl Omega/ ground-signal-signal-ground (GSSG) leads, small-sized 60-/spl feed-through, and wire-bonding pad, provides less sensitivity to lead length. Integrating 25-/spl matching resistances microstrip line, whose length corresponds one eighth wavelength at 7 GHz, gives wide-band...

An efficient and low-cost optical alignment technique is established for the first time compact transmitter sub-assemblies (TOSAs) with an integrated multiplexer based on free space optics (FSO) 100 400 Gbps Ethernet (GbE) applications. A FSO system GbE TOSA fabricated in a package 6.5 × 15.1 5.6 mm size to confirm validity of technique. It demonstrated by experiment that optimum condition can successfully be figured out this without any expensive equipment, which has been significant issue...

This paper presents a polarization-insensitive semiconductor optical amplifier Mach-Zehnder Interferometer (SOA-MZI) wavelength converter with wide dynamic range. Direct detection of the wavelength-converted output signal power and feedback control input to SOA-MZI are proposed confirmed be able reduce variation polarization. The gain-controlled SOA (GC-SOA) monitor PD used implement monolithically integrated into converter. A range over 8 dB is obtained for TE TM polarized signals NRZ...

The market needs for satellite communication networks have changed recently. Accordingly, low-earth-orbit (LEO) constellations, which are expected to meet these demands, been attracting increasing attention. In the existing method that uses LEO located in vicinity of terminal issues request processes it, regardless state its battery. However, this shortens lifetime instances severe battery deterioration. Thus, is ineffective large-scale constellations wherein running costs an issue....

A compact four-channel 25Gbps receiver with built-in demultiplexer realizes high sensitivity less than -12.1dBm and low cross-talk penalty of 0.1dB per channel in 12mm × 17mm 7mm for the next-generation 100Gbps Ethernet applications.

A lens-coupled hybrid optical integration system for a 100GbE transmission module is demonstrated the first time. The multi-channel has been realized via precise lens-alignment technique exploiting high-power laser irradiation.

This first super-splits 10G-EPON demonstration achieved the largest loss budget of 35.9 dB and a fast dual-rate synctime 240 ns supporting 256 ONU splits with 8.0 Gb/s upstream throughput, highlighting novel self-switching AGC based XFP, 82.5 GS/s CDR SFP+.

A novel wavelength-tunable dual-output laser module is proposed. The measured output powers are 13.8 dBm and 10.8 with a low power consumption of 3.0 W. We achieved compactness suitable for micro-ITLA no additional external optical components.

We have developed a 1.55-μm 40 Gbps electro-absorption modulator laser (EML)-based transmitter optical subassembly (TOSA) using novel flexible printed circuit (FPC). The return loss at the junctions of board and FPC, FPC ceramic feedthrough connection was held better than 20 dB up to GHz by newly three-layer FPC. TOSA fabricated demonstrated mask margin >16% path penalty <;0.63 for 43 signal after 2.4-km SMF transmission over entire case temperature range from -5° 80 °C, demonstrating...

The optical triplexer module, which consists of a 10.3-Gb/s transmitter [electroabsorption modulator integrated laser diode (EA-LD)], 1.25-Gb/s (distributed feedback (DFB)-LD), and 10.3-Gb/s/1.25-Gb/s dual-rate receiver [avalanche photodiode (APD)], has been developed for 10-Gb Ethernet passive network (10G-EPON) line terminal (OLT) transceiver. We have adopted newly three lens system to accomplish high coupling efficiencies two LDs as -2.84 -1.65 dB. Moreover, we preamp IC responsivity APD...

In this paper, we demonstrated the use of a photodiode (PD) packaging technique that employs catadioptric system. This optical system consisted two components: BK7 ball lens with diameter 1.5 mm was soldered glass on hermetic cap and plastic-molded offset parabolic mirror radius 550 mu m an m. The mounted above surface-illuminated InGaAs pin PD detective area 20 mum. When incident pencil rays were passed through then perpendicularly reflected by impinged upon PD, compact planar assembling...

A 43 Gbps electro-absorption modulator laser was packaged in a miniaturized module with novel impedance matched flexible printed circuit connection aiming for CFP2 transceiver showing ITU-T G.693 compliance.

We review the latest progress of burst-mode transceivers for 10G-EPON. The OLT XFP with fast/slow self-switching AGC and ONU SFP+ can achieve a loss budget 35.9 dB fast sync time 240 ns, which realize 256-split 15 km transmission.

Ethernet has become an indispensable technology for communications, and come into use many applications. At the IEEE, high-speed standardization been discussed seen adoption of new technologies such as multi-level modulation formats, high baud rate dense wave length division multiplexing. The MSA transceiver form factor also following IEEE standardization. Optical devices TOSA ROSA have required to more compact higher-speed, because each be miniaturized high-density construction. We...

A novel rear-side wavelength monitor scheme for a 16-DFB LD array with unequally spaced waveguides is proposed. The measured variations in the monitored wavelengths are less than ±1.2 GHz across ITU-T grid.

We propose a functional wavelength multicasting scheme accompanied with all-optical NRZ-OOK / RZ-BPSK modulation format conversion, using cross-phase in SOA-MZI. experimentally demonstrate error free 4-channel for 10.7 Gbps input.

A novel wavelength monitor scheme using unequally spaced back-emitting light for a tunable LD array is proposed. The measured variations in the are less than +0.15 GHz at ITU-T grids.