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40 GHz or 40 Gb/s Lithium Niobate Modulators
40 Gb/s DQPSK Modulator
40 GHz Phase Modulator without Polarizer
The LN05S-FC, LN27S-FC, and the LN66S-FC are 40 GHz modulators manufactured by Thorlabs. These three revolutionary, high-performance, titanium-indiffused Z-cut lithium niobate optical modulators were designed for ease of system integration; they offer large bandwidths and are ideal for developing high-speed modulation systems.
The LN05S-FC intensity modulator with external DC bias is a high-performance 40 GHz modulator that has a single-ended drive configuration with a fixed chirp coefficient of ±0.7. The LN05S-FC has a Mach-Zehnder interferometric architecture with external DC bias, ideal for both NRZ and RZ data format solutions. The LN27S-FC and the LN66S-FC are high-performance 40 GHz phase modulators, allowing for chirp control in high-speed data communications. These modulators, which can support data rates up to 43 Gb/s, are also ideal for applications in coherent communications, sensing, all-optical frequency shifting, and data encryption.
The LN27S-FC and LN66S-FC modulators both offer internal RF terminations, but the LN27S-FC also offers an optical polarizer not included with the LN66S-FC. All three modulators are based on Z-cut titanium-indiffused LiNbO3 and are hermetically packaged in a dual-port housing with PM and SM fiber pigtails on the device input and output, respectively. The fiber pigtails are offered connectorized with FC/PC connectors. Please note that polarization-maintaining fiber and a full range of connectorization options are available for all Lithium Niobate Modulators. Please contact Tech Support for assistance and details.
The LN86S-FC is a Dual-Parallel, Titanium-Indiffused, X-Cut Lithium Niobate Modulator. It is capable of providing a 40 Gb/s signaling rate and offers a large bandwidth to benefit customers developing high-speed modulation systems. Each Mach-Zehnder Interferometer (MZI) has an independently-controlled bias section to achieve maximum performance. The front end of the modulator consists of two MZIs in parallel. Each MZI is an intensity modulator with separate external DC bias controls, giving the user the ability to perform multi-level signaling. The back end of the LN86S-FC is a phase modulator which allows for the required phase control in the signal channel. The LN86S-FC is designed for quadrature modulation (QPSK or 4QAM) and single side-band suppressed carrier (SSB-SC) transmission. This modulator is part of a family of high-performance, Telcordia-compliant, external optical modulators with industry-leading long-term stability. It is hermetically packaged in a durable housing with PM and SM fiber pigtails on the device input and output, respectively. The standard device has fiber pigtails connectorized with FC/PC connectors. Please contact Tech Support for customization of these products.
Mach-Zehnder Modulator Operation
In this dual-parallel modulator, the incoming signal is equally split into two legs and sent through separate intensity modulators. Each intensity modulator can be modulated with a DPSK format. The outputs of each intensity modulator's legs are re-combined then sent through a low speed phase modulator. The phase modulator serves the purpose of applying a phase delay between the legs. The resultant output of the phase modulation section is then recombined and can form a DQPSK signal.
Note: The modulator is designed for use at 1550 nm. Using the modulator at another wavelength may cause a temporary increase in loss that is not covered under warranty. For instance, the increase in loss caused by shorter wavelengths can be reversed by heating the modulator to 50 °C for an hour.