TV has optical audio out only...my Soundbar only has hdmi in ... do I need to buy to get this hooked up

Feb 10, 2018
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I have a samsung soundbar model E250 soundbar and a Samsung LCD tv model #LN46C610N1F . I can't seem to get any sound at all. My TV does not have ARC. It only has Optical out for audio. My sound bar only has HDMI in-port connection. What do I need to buy to get this hooked up